import javax.swing.*; import javax.swing.GroupLayout.Alignment; import javax.swing.event.ChangeEvent; import javax.swing.event.ChangeListener; import java.awt.*; public class Main extends JFrame { private JLabel la=new JLabel("I Love Java"); JSlider slider=new JSlider(JSlider.HORIZONTAL,1,100,1); public Main() { setTitle("JSlider Practice Frame"); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); Container c= getContentPane(); c.setLayout(new BorderLayout()); c.add(slider); slider.setPaintLabels(true); slider.setPaintTicks(true); slider.setPaintTrack(true); slider.setMajorTickSpacing(20); slider.setMinorTickSpacing(5); slider.addChangeListener(new MyChangeListener()); c.add(la,BorderLayout.CENTER); la.setOpaque(true); c.add(slider,BorderLayout.NORTH); setSize(300,300); setVisible(true); } class MyChangeListener implements ChangeListener{ public void stateChanged(ChangeEvent e) { la.setFont(new Font("Arial", Font.PLAIN, slider.getValue())); repaint(); } } public static void main(String[] args) { new Main(); } } */ import javax.swing.*; import javax.swing.event.ChangeEvent; import javax.swing.event.ChangeListener; import java.awt.*; import java.util.Random; public class Main extends JFrame { private JLabel []la = new JLabel[10]; public Main() { for(int i =0; i<la.length; i++) { la[i] = new JLabel(); double x = Math.random() * 1000; // 0 ~ 1 * 400 double y=Math.random()*1000; setTitle("Ten 레이블 클릭"); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); Container c=getContentPane(); setSize(300,300); } } public static void main(String[] args) { new Main(); } }

import javax.swing.*; import java.awt.*; public class Main extends JFrame { public Main() { setTitle("체크박스 만들기 예제"); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); Container c=getContentPane(); c.setLayout(new FlowLayout()); ImageIcon cherryIcon=new ImageIcon("cherry.png"); ImageIcon selectedCherryIcon=new ImageIcon("selectedCherry.png"); JCheckBox apple=new JCheckBox("사과"); JCheckBox pear=new JCheckBox("배",true); JCheckBox cherry=new JCheckBox("체리",cherryIcon); cherry.setBorderPainted(true); cherry.setSelectedIcon(selectedCherryIcon); c.add(apple); c.add(pear); c.add(cherry); setSize(250,150); setVisible(true); } public static void main(String[] args) { new Main(); } } */ /* import javax.swing.*; import java.awt.event.*; import java.awt.*; public class Main extends JFrame { private JCheckBox [] fruits=new JCheckBox [3]; private String [] names= {"사과","배","체리"}; private JLabel sumLabel; public Main() { setTitle("체크박스와 ItemEvent 예제"); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); Container c=getContentPane(); c.setLayout(new FlowLayout()); c.add(new JLabel("사과 100원,배 500원,체리 20000원")); MyItemListener listener = new MyItemListener(); for(int i=0;i<fruits.length;i++) { fruits[i]=new JCheckBox(names[i]); fruits[i].setBorderPainted(true); c.add(fruits[i]); fruits[i].addItemListener(listener); } sumLabel =new JLabel("현재 0원 입니다."); c.add(sumLabel); setSize(250,200); setVisible(true); } class MyItemListener implements ItemListener { private int sum=0; public void itemStateChanged(ItemEvent e) { if(e.getStateChange()==ItemEvent.SELECTED) { if(e.getItem()==fruits[0]) sum+=100; else if(e.getItem()==fruits[1]) sum+=500; else sum+=20000; } else { if(e.getItem()==fruits[0]) sum-=100; else if(e.getItem()==fruits[1]) sum-=500; else sum-=20000; } sumLabel.setText("현재 "+sum+"원 입니다."); } } public static void main(String[] args) { new Main(); } } */ /* import javax.swing.*; import java.awt.*; public class Main extends JFrame { public Main() { setTitle("체크박스 만들기 예제"); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); Container c=getContentPane(); c.setLayout(new FlowLayout()); ImageIcon cherryIcon=new ImageIcon("cherry.png"); ImageIcon selectedCherryIcon=new ImageIcon("selectedCherry.png"); ButtonGroup g=new ButtonGroup(); JRadioButton apple=new JRadioButton("사과"); JRadioButton pear=new JRadioButton("배",true); JRadioButton cherry=new JRadioButton("체리",cherryIcon); cherry.setBorderPainted(true); cherry.setSelectedIcon(selectedCherryIcon); g.add(apple); g.add(pear); g.add(cherry); c.add(apple); c.add(pear); c.add(cherry); setSize(250,150); setVisible(true); } public static void main(String[] args) { new Main(); } } */ /* import javax.swing.*; import java.awt.event.*; import java.awt.*; public class Main extends JFrame { private JRadioButton [] radio=new JRadioButton [3]; private String [] text= {"사과","배","체리"}; private ImageIcon [] image= { new ImageIcon("apple.png"), new ImageIcon("pear.png"), new ImageIcon("cherry.png")}; private JLabel ImageLabel =new JLabel(); public Main() { setTitle("라디오버튼 Item Event 예제"); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); Container c=getContentPane(); c.setLayout(new BorderLayout()); JPanel radioPanel =new JPanel(); radioPanel.setBackground(Color.GRAY); ButtonGroup g= new ButtonGroup(); for(int i=0;i<radio.length;i++) { radio[i]=new JRadioButton(text[i]); g.add(radio[i]); radioPanel.add(radio[i]); radio[i].addItemListener(new MyItemListener()); } radio[2].setSelected(true); c.add(radioPanel,BorderLayout.NORTH); c.add(ImageLabel,BorderLayout.CENTER); ImageLabel.setHorizontalAlignment(SwingConstants.CENTER); setSize(250,200); setVisible(true); } class MyItemListener implements ItemListener { public void itemStateChanged(ItemEvent e) { if(e.getStateChange()==ItemEvent.DESELECTED) return; if(radio[0].isSelected()) ImageLabel.setIcon(image[0]); else if(radio[1].isSelected()) ImageLabel.setIcon(image[1]); else ImageLabel.setIcon(image[2]); } } public static void main(String[] args) { new Main(); } } */ /* import javax.swing.*; import javax.swing.event.ChangeEvent; import javax.swing.event.ChangeListener; import java.awt.*; public class Main extends JFrame { private JLabel la=new JLabel(); JSlider slider =new JSlider(JSlider.HORIZONTAL,100,200,100); public Main() { setTitle("슬라이더 만들기 예제"); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); Container c=getContentPane(); c.setLayout(new FlowLayout()); c.add(slider); slider.setPaintLabels(true); slider.setPaintTicks(true); slider.setPaintTrack(true); slider.setMajorTickSpacing(20); slider.addChangeListener(new MyChangeListener()); c.add(la); la.setBackground(Color.GREEN); la.setOpaque(true); setSize(300,100); setVisible(true); } class MyChangeListener implements ChangeListener{ public void stateChanged(ChangeEvent e) { la.setText(Integer.toString(slider.getValue())); repaint(); } } public static void main(String[] args) { new Main(); } }

//1. 함수 -> 메소드 // 자동완성 ctrl + space // 컴파일 ctrl + F11 // 자동 정렬 ctrl + shift + f /* import java.util.*; public class Main { //메인 클래스 public static void main(String[] args) { // 자료형 int a=10; long b; //long long int 아님 주의!1 float c; double d; char e; //문자 String f="love";//문자열 //출력 syso + ctrl +space //System.out.println("hello"); //System.out.println("hello "+a); //입력 Scanner 객체 생성 Scanner sc = new Scanner(System.in); int x = sc.nextInt(); System.out.println(x); float y = sc.nextFloat(); System.out.println(y); String s = sc.next(); System.out.println(s); String t = sc.nextLine(); // 한 줄 } } */ /* import java.util.*; public class Main { public static void main(String[] args) { Scanner sc = new Scanner(System.in); int a=sc.nextInt(); System.out.println(a); } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc = new Scanner(System.in); float a=sc.nextFloat(); System.out.printf("%.6f",a); } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); int a=sc.nextInt(); System.out.print(a+" "+a+" "+a); } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); float a=sc.nextFloat(); float b=sc.nextFloat(); System.out.printf("%.2f",a*b); } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); int a=sc.nextInt(); int b=sc.nextInt(); System.out.printf("%.1f",a*b/2.0); } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); int a=sc.nextInt(); if(50<=a&&a<=70||a%6==0){ System.out.println("win"); } else{ System.out.println("lose"); } } } */ /* import java.util.*; public class Main { public static void main(String[] args) { Scanner sc = new Scanner(System.in); int a = sc.nextInt(); int b = sc.nextInt(); if (b >= 30) { b -= 30; } else if (a != 0) { a--; b += 30; } else { a = 23; b += 30; } System.out.println(a + " " + b); } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); int a=sc.nextInt(); int b=sc.nextInt(); int c=sc.nextInt(); if(170<a&&170<b&&170<c) { System.out.println("PASS"); } else if(170>=a){ System.out.println("CRASH "+a); } else if(170>=b){ System.out.println("CRASH "+b); } else{ System.out.println("CRASH "+c); } } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); int a=sc.nextInt(); int b=sc.nextInt(); int c=sc.nextInt(); int n=sc.nextInt(); for(int i=1;i<n;i++) { a=a*b+c; } System.out.println(a); } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); int a=sc.nextInt(); int b=sc.nextInt(); for(int i=a;i<=b;i++) { for(int j=1;j<=9;j++) { System.out.printf("%d*%d=%d\n",i,j,i*j); } } } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); int n=sc.nextInt(); for(int i=n-1;i>=0;i--) { for(int j=1;j<=i;j++) { System.out.print(" "); } for(int j=1;j<=n;j++) { System.out.print("*"); } System.out.println(); } } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); int n=sc.nextInt(); for(int i=n-1;i>=0;i--) { for(int j=1;j<=i;j++) { System.out.print(" "); } for(int j=1;j<=n;j++) { System.out.print("*"); } System.out.println(); } } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); int n = sc.nextInt(); int arr[] = new int[n]; for(int i=0;i<n;i++){ arr[i]=sc.nextInt(); } for(int i=0;i<n;i++){ for(int j=i;j<n;j++){ System.out.print(arr[j]+" "); } for(int j=0;j<=i-1;j++) { System.out.print(arr[j]+" "); } System.out.println(); } } } import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); int arr[]=new int[10]; for(int i=0;i<10;i++) { arr[i]=sc.nextInt(); } int k=sc.nextInt(); System.out.println(arr[k-1]); } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); String str = sc.nextLine(); for(int i=0;i<str.length();i++) { System.out.print(str.charAt(i)+" "); } } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); String str=sc.next(); for(int i=0;i<str.length();i++) { System.out.println("'"+str.charAt(i)+"'"); } } } */ /* import java.util.*; public class Main { public static void main(String[] args) { Scanner sc = new Scanner(System.in); String s1 = sc.next(); String s2 = sc.next(); String s3 = sc.next(); if (s1.charAt(s1.length() - 1) == s2.charAt(0)&&s2.charAt(s2.length() - 1) == s3.charAt(0)&&s3.charAt(s3.length() - 1) == s1.charAt(0)) { System.out.println("good"); } else { System.out.println("bad"); } } } 클래스 : 틀 필드 + 메소드(함수) + 생성자 객체 : 클래스로 찍어낸 것 들.. import java.util.*; class Person{ //field 필드 int age; String name; //메소드 void speak() { System.out.println(age+" ,hi im "+name+"..."); } void sleep() { } } public class Main{ public static void main(String[] args) { Person a = new Person(); //a 객체 생성 Person b = new Person(); a.age=10; a.name="james"; a.speak(); b.age=30; b.name = "Mark"; b.speak(); } } */ /* import java.util.*; class Circle{ int radius; String name; //생성자 - 객체를 생성할때, 필드의 초깃값 설정 public Circle(int radius) { this.radius=radius; } public Circle(int radius, String name) { this.radius=radius; this.name=name; } public double getArea() { return 3.14*radius*radius; } } public class Main{ public static void main(String[] args) { Circle pizza=new Circle(10,"A"); double area =pizza.getArea(); System.out.println(pizza.name+"의 면적은"+area); Circle donut=new Circle(2); // donut.radius=2; // donut.name="B"; // area=donut.getArea(); // System.out.println(donut.name+"의 면적은"+area); } } */ /* class Circle { int radius; String name; public Circle() { radius = 1; name = ""; } public Circle(int r, String n) { radius = r; name = n; } public double getArea() { return 3.14 * radius * radius; } } class Main { public static void main(String[] args) { Circle pizza = new Circle(10, "A"); double area = pizza.getArea(); System.out.println(pizza.name + "의 면적은" + area); } } */ /* import java.util.*; class Song { String title; public Song(String title) { this.title=title; } public String gettitle() { return title; } } public class Main{ public static void main(String[] args) { Song mysong=new Song("Nessun Dorma"); Song yoursong= new Song("공주는 잠 못 이루고"); System.out.println("네 노래는 "+ mysong.gettitle()); System.out.println("너 노래는 "+yoursong.gettitle()); } } 접근지정자 public 다른 모든 클래스에서 접근 가능 private 그 클래스 내부에서만 접근 가능 */ /* import java.util.*; class Phone { private String tel, name; public Phone(String tel, String name) { this.tel = tel; this.name = name; } public String getName(){ return name; } public String getTel() { return tel; } } public class Main { public static void main(String[] args) { Scanner sc=new Scanner(System.in); int arr[50]; (X) int arr[] = new int [50]; //(o) //객체배열생성시 두번 해야한다 Phone parr[] = new Phone[50]; //레퍼런스변수 생성 for(int i=0; i<parr.length; i++) { String name = sc.next(); String tel =sc.next(); parr[i] = new Phone(tel,name); //객체생성 } System.out.print("이름과 전화번호 입력 >>"); String name = sc.next(); String tel =sc.next(); Phone mytel = new Phone(tel,name); System.out.println("이름과 전화번호 입력 >>"); String name1=sc.next(); String tel1=sc.next(); Phone yourtel=new Phone(tel1,name1); System.out.println(mytel.name+"의 번호"+mytel.tel); System.out.println(mytel.getName()+"의 번호"+mytel.getTel()); System.out.println(yourtel.getName()+"의 번호"+yourtel.getTel()); } } */ /* import java.util.*; class Book{ String title,author; public Book(String title,String author) { this.title=title; this.author=author; } } public class Main{ public static void main(String[] args) { Book[]book=new Book[2]; Scanner sc=new Scanner(System.in); for(int i=0;i<book.length;i++) { System.out.println("제목>>"); String title=sc.nextLine(); System.out.print("저자>>"); String author=sc.nextLine(); book[i]=new Book(title,author); } } } */ /* import java.util.*; class Rect{ private int width,height; public Rect(int width,int height) { this.width=width; this.height=height; } public int getArea() {return width*height;} } public class Main{ public static void main(String[] args) { Rect[]rect= new Rect[4]; Scanner sc=new Scanner(System.in); for(int i=0;i<rect.length;i++) { System.out.print(i+1); System.out.print(" 너비와 높이 >>"); int width=sc.nextInt(); int height=sc.nextInt(); rect[i] = new Rect(width,height); } int sum=0; for(int i=0;i<rect.length;i++) { sum=sum+rect[i].getArea(); } System.out.print("저장하였습니다..."); System.out.println("사각형의 전체 합은 "+sum); } } */ /* import java.util.*; class Phone { private String name, tel; public Phone(String name, String tel) { this.name = name; this.tel = tel; } public String getname() {return name;} public String gettel() {return tel;} } public class Main { public static void main(String[] args) { Scanner sc=new Scanner(System.in); //1. System.out.print("인원수>>"); int n = sc.nextInt(); Phone[] phone= new Phone[n]; //2. for(int i=0;i<phone.length;i++) { System.out.print("이름과 전화번호(번호는 연속적으로 입력)>>"); String name=sc.next(); String tel=sc.next(); phone[i]=new Phone(name,tel); } System.out.println("저장되었습니다..."); //3. while(true) { System.out.print("검색할이름>>"); String name = sc.next(); int flag=0; for(int i=0;i<phone.length;i++) { if(name.equals(phone[i].getname())) { flag=1; System.out.println(name+" 의 번호는 " +phone[i].gettel()+" 입니다."); break; } } if(flag==0) { System.out.println(name+" 이 없습니다."); } if(name.equals("exit")) break; } System.out.println("프로그램을 종료합니다..."); } } */ /* import java.util.*; class Point { private int x,y; public Point(int x,int y) {this.x=x;this.y=y;} public int getX() {return x;} public int getY() {return y;} protected void move(int x,int y) {this.x=x;this.y=y;} } class ColorPoint extends Point{ private String color; public ColorPoint(int x,int y,String color) { super(x,y); this.color=color; } public void setPoint(int x,int y){ move(x,y); } public void setColor(String color) { this.color=color; } public void show() { System.out.println(color+"색으로"+"("+getX()+","+getY()+")"); } } class Main{ public static void main(String[] args) { ColorPoint cp=new ColorPoint(5,5,"YELLOW"); //ColorPoint 객체 생성 cp.setPoint(10, 20); cp.setColor("GREEN"); cp.show(); } } class abstract class 추상클래스 (일부만 작성된 클래스) interface 인터페이스 (틀만 있는 클래스) import java.util.*; interface StackInterface { int length(); //추상메소드 (내용이 작성이 안된 메소드) String pop(); boolean push(String ob); } class StringStack implements StackInterface { private int top=-1; //top이 마지막 데이터의 위치 String stack[] = new String[5]; //추상메소드들 구현 public int length() { return top+1; } public String pop() { return stack[top--]; } public boolean push(String ob) { if(top!=4){ top++; stack[top]=ob; return true; } else return false; } } class Main { public static void main(String[] args) { Scanner sc=new Scanner(System.in); StringStack cp=new StringStack(); for(int i=0;i<5;i++) { String str = sc.next(); cp.push(str); } for(int i=0;i<5;i++) { System.out.print(cp.pop()+" "); } } } import java.util.*; interface Shape { final double PI=3.14; void draw(); double getArea(); default public void redraw() { System.out.println("--- 다시 그립니다. ---"); draw(); } } class Circle implements Shape { private int radius; public Circle (int radius) { this.radius=radius; } public void draw() { System.out.print("반지름 "+radius); } public double getArea() { return radius*radius*PI; } } public class Main { public static void main(String[] args) { Shape coin=new Circle(10); coin.redraw(); System.out.print(" 코인의 면적은"+coin.getArea()); } GUI GRAPHIC USER INTERFACE 그래픽으로 컴퓨터랑 소통하기 컴포넌트 - Button, TextField, JLabel 컨테이너 - Frame, Panel, contain(포함하다) +er import java.awt.*; import javax.swing.*; public class Main extends JFrame { public Main() { //기본 셋팅 setSize(1000,300); setVisible(true); //프레임 이름지어주기 Container c = getContentPane(); c.setBackground(Color.yellow); // 배경색 설정 //layout 레이아웃 : 배치관리자 c.setLayout(new FlowLayout()); //컨테이너에 컴포넌트 추가 방법1 JButton b1 = new JButton("예준1"); b1.setBackground(Color.green); //버튼의 배경색 설정 b1.setForeground(Color.white); //버튼의 글자색 설정 c.add(b1); //컨테이너에 컴포넌트 추가 방법2 c.add(new JButton("예준2")); JLabel la = new JLabel("라벨입니다"); c.add(la); } public static void main(String[] args) { Main frame=new Main(); } } 문제 1 가로 500픽셀 세로 300픽셀 컨테이너 배경색은 white 라벨, 버튼, 버튼 라벨 "label" 글자색은 red 버튼 "버튼1" 배경색은 green 글자색 white 버튼 "버튼2" 배경색은 blue 글자색 white import javax.swing.*; import java.awt.*; public class Main extends JFrame { public Main() { setSize(300,500); setVisible(true); Container c=getContentPane(); c.setLayout(new FlowLayout()); c.setBackground(Color.white); JLabel la=new JLabel("label"); la.setForeground(Color.red); c.add(la); JButton b1=new JButton("버튼1"); b1.setBackground(Color.green); b1.setForeground(Color.white); c.add(b1); JButton b2=new JButton("버튼2"); b2.setBackground(Color.blue); b2.setForeground(Color.white); c.add(b2); } public static void main(String[] args) { Main frame=new Main(); } } c.setLayout(null); c.setBackground(Color.white); JLabel la=new JLabel("label-0"); la.setForeground(Color.red); la.setSize(50,50); la.setLocation(100,50); c.add(la); layout(배치관리자) 1. flowlayout : 그냥 적당히 알아서 순서대로 위치, 사이즈 지정 (내가 위치와 사이즈를 정할 수 없다) 2. null : 배치관리자가 아예 없다. 꼭 사이즈와 위치를 지정해주어야 한다. 3. gridlayout : 이차원배열 형태로 순서대로 집어넣어준다 (내가 위치와 사이즈를 정할 수 없다) 4. BorderLayout : 동서남북중앙 import javax.swing.*; import java.awt.*; public class Main extends JFrame { public Main() { setSize(500,300); setVisible(true); Container c=getContentPane(); c.setLayout(new BorderLayout()); JPanel p1 = new JPanel(); p1.setBackground(Color.red); c.add(p1,BorderLayout.CENTER); p1.setLayout(null); JButton b1 = new JButton("center button"); b1.setSize(200, 100); b1.setLocation(100, 100); p1.add(b1); JPanel p2 = new JPanel(); p2.setBackground(Color.white); c.add(p2,BorderLayout.NORTH); p2.add(new JButton("north button")); p2.add(new JButton("north button")); // JButton b1 = new JButton("button1"); // c.add(b1,BorderLayout.EAST); // JButton b2 = new JButton("button2"); // c.add(b2,BorderLayout.CENTER); // JButton b3 = new JButton("button3"); // c.add(b3,BorderLayout.WEST); // for(int i=0;i<6;i++) { // JButton b = new JButton("button"+i); // c.add(b); // } } public static void main(String[] args) { Main frame=new Main(); } } */ /* import javax.swing.*; import java.awt.*; public class Main extends JFrame { public Main() { setSize(400,400); setVisible(true); Container c=getContentPane(); c.setLayout(new BorderLayout(7,5)); JButton b1=new JButton("North"); c.add(b1,BorderLayout.NORTH); JButton b2=new JButton("West"); c.add(b2,BorderLayout.WEST); JButton b5=new JButton("Center"); c.add(b5,BorderLayout.CENTER); JButton b3=new JButton("South"); c.add(b3,BorderLayout.SOUTH); JButton b4=new JButton("East"); c.add(b4,BorderLayout.EAST); } public static void main(String[] args) { Main frame=new Main(); } } */ /* import javax.swing.*; import java.awt.*; public class Main extends JFrame { public Main() { setSize(800,400); setVisible(true); Container c=getContentPane(); c.setLayout(new GridLayout(1,10)); for(int i=0;i<10;i++) { String si = Integer.toString(i); //정수를 문자열로 변환할때 쓰임!!! 꼭 기억하기!!! JButton b=new JButton(si); c.add(b); } } public static void main(String[] args) { Main frame=new Main(); } }*/ //527p /* import javax.swing.*; import java.awt.*; public class Main extends JFrame { public Main() { setSize(500,600); setVisible(true); Container c=getContentPane(); c.setLayout(new BorderLayout()); JPanel p1=new JPanel(); p1.setBackground(Color.gray); c.add(p1,BorderLayout.NORTH); JPanel p2=new JPanel(); p2.setBackground(Color.lightGray); c.add(p2,BorderLayout.CENTER); } public static void main(String[] args) { Main frame=new Main(); } } */ /* import java.awt.*; import java.awt.event.*; import javax.swing.*; public class Main extends JFrame { public Main() { setSize(470,200); setVisible(true); } public static void main(String[] args) { Main frame=new Main(); } } */ /* import javax.swing.*; import java.awt.*; import java.awt.event.*; public class Main extends JFrame { private JLabel la1=new JLabel("0"); private JLabel la2=new JLabel("0"); private JLabel la3=new JLabel("0"); private JLabel la4=new JLabel("시작합니다."); public Main() { setTitle("Open Challenge 10"); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); Container c=getContentPane(); c.addKeyListener(new MyKeyListener()); c.setLayout(null); c.add(la1); c.add(la2); c.add(la3); c.add(la4); la1.setBackground(Color.MAGENTA); la1.setSize(100,40); la1.setLocation(100,50); la1.setOpaque(true); la1.setHorizontalAlignment(JLabel.CENTER); la1.setForeground(Color.YELLOW); la1.setFont(new Font("Arial",Font.ITALIC, 40)); la2.setBackground(Color.MAGENTA); la2.setSize(100,40); la2.setLocation(240,50); la2.setOpaque(true); la2.setHorizontalAlignment(JLabel.CENTER); la2.setForeground(Color.YELLOW); la2.setFont(new Font("Arial",Font.ITALIC,40)); la3.setBackground(Color.MAGENTA); la3.setSize(100,40); la3.setLocation(380,50); la3.setOpaque(true); la3.setHorizontalAlignment(JLabel.CENTER); la3.setForeground(Color.YELLOW); la3.setFont(new Font("Arial",Font.ITALIC,40)); la4.setSize(100,10); la4.setLocation(260,120); c.setFocusable(true); c.requestFocus(); setSize(600,200); setVisible(true); } class MyKeyListener extends KeyAdapter { public void keyPressed(KeyEvent e) { if(e.getKeyCode()==10) { int x = (int)(Math.random()*5), y = (int)(Math.random()*5), z = (int)(Math.random()*5); la1.setText(Integer.toString(x)); la2.setText(Integer.toString(y)); la3.setText(Integer.toString(z)); if(x==y && y==z) { la4.setText("축하합니다!!"); } else { la4.setText("아쉽군요"); } } } } public static void main(String[] args) { new Main(); } } /* Math.random() : 0이상 1미만의 랜덤 실수 0.8 0.12 0.7777 0.99999 Math.random()*5 : 0이상 5미만의 랜덤 실수 (int)(Math.random()*5) : 0이상 5 미만의 랜덤 정수 (int)(Math.random())*5 : 0 (x) */ /* import javax.swing.*; import java.awt.*; public class Main extends JFrame { public Main() { setTitle("레이블 예제"); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); Container c=getContentPane(); c.setLayout(new FlowLayout()); JLabel textLabel =new JLabel("ㅎㅇ"); ImageIcon beauty =new ImageIcon("beauty.png"); JLabel imageLabel=new JLabel(beauty); ImageIcon normalIcon =new ImageIcon("normalIcon.png"); JLabel label =new JLabel("normal",normalIcon,SwingConstants.CENTER); c.add(textLabel); c.add(imageLabel); c.add(label); setSize(400,600); setVisible(true); } public static void main(String[] args) { new Main(); } } */ /* import javax.swing.*; import java.awt.*; public class Main extends JFrame { public Main() { setTitle("이미지 버튼 예제"); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); Container c= getContentPane(); c.setLayout(new FlowLayout()); ImageIcon normalIcon=new ImageIcon("normalIcon2.png"); ImageIcon rolloverIcon=new ImageIcon("rolloverIcon.png"); ImageIcon pressedIcon =new ImageIcon("pressedIcon.png"); JButton btn=new JButton("call~~",normalIcon); btn.setPressedIcon(pressedIcon); btn.setRolloverIcon(rolloverIcon); c.add(btn); setSize(250,150); setVisible(true); } public static void main(String[] args) { new Main(); } } */ import javax.swing.*; import java.awt.*; import java.awt.event.*; public class Main extends JFrame { JButton btn1=new JButton(new ImageIcon("left-arrow.png")); JButton btn2=new JButton(new ImageIcon("right-arrow.png")); JPanel p1 = new JPanel(); int iconnum=0; ImageIcon[] icon = new ImageIcon[4]; JLabel la = new JLabel(new ImageIcon("국기-1.png")); Container c= getContentPane(); public Main() { setTitle("Open Challenge 11"); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); c.setLayout(new BorderLayout()); icon[0] = new ImageIcon("국기-1.png"); icon[1] = new ImageIcon("국기-2.png"); icon[2] = new ImageIcon("국기-3.png"); icon[3] = new ImageIcon("국기-4.png"); c.add(p1, BorderLayout.CENTER); p1.add(la); btn1.addActionListener(new MyActionListener()); btn2.addActionListener(new MyActionListener()); JPanel p2 = new JPanel(); p2.setLayout(new FlowLayout()); c.add(p2,BorderLayout.SOUTH); p2.add(btn1); p2.add(btn2); setVisible(true); setSize(500, 500); } //num 0 1 2 3 4 5 6 7 8 9 //num%4 0 1 2 3 0 1 2 3 0 1 class MyActionListener implements ActionListener { public void actionPerformed(ActionEvent e) { JButton pressed_btn = (JButton)e.getSource(); if(pressed_btn.equals(btn2)) {// -> iconnum=(iconnum+1)%4; la.setIcon(icon[iconnum]); c.repaint(); } else {// <- if(iconnum==0) iconnum=3; else iconnum=(iconnum-1); la.setIcon(icon[iconnum]); c.repaint(); } } } public static void main(String[] args) { new Main(); } }

import javax.swing.*; import java.awt.*; import java.awt.event.*; public class Main extends JFrame { private JLabel la1=new JLabel("0"); private JLabel la2=new JLabel("0"); private JLabel la3=new JLabel("0"); private JLabel la4=new JLabel("시작합니다."); public Main() { setTitle("Open Challenge 10"); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); Container c=getContentPane(); c.addKeyListener(new MyKeyListener()); c.setLayout(null); c.add(la1); c.add(la2); c.add(la3); c.add(la4); la1.setBackground(Color.MAGENTA); la1.setSize(100,40); la1.setLocation(100,50); la1.setOpaque(true); la1.setHorizontalAlignment(JLabel.CENTER); la1.setForeground(Color.YELLOW); la1.setFont(new Font("Arial",Font.ITALIC, 40)); la2.setBackground(Color.MAGENTA); la2.setSize(100,40); la2.setLocation(240,50); la2.setOpaque(true); la2.setHorizontalAlignment(JLabel.CENTER); la2.setForeground(Color.YELLOW); la2.setFont(new Font("Arial",Font.ITALIC,40)); la3.setBackground(Color.MAGENTA); la3.setSize(100,40); la3.setLocation(380,50); la3.setOpaque(true); la3.setHorizontalAlignment(JLabel.CENTER); la3.setForeground(Color.YELLOW); la3.setFont(new Font("Arial",Font.ITALIC,40)); la4.setSize(100,10); la4.setLocation(260,120); c.setFocusable(true); c.requestFocus(); setSize(600,200); setVisible(true); } class MyKeyListener extends KeyAdapter { public void keyPressed(KeyEvent e) { if(e.getKeyCode()==10) { int x = (int)(Math.random()*5), y = (int)(Math.random()*5), z = (int)(Math.random()*5); la1.setText(Integer.toString(x)); la2.setText(Integer.toString(y)); la3.setText(Integer.toString(z)); if(x==y && y==z) { la4.setText("축하합니다!!"); } else { la4.setText("아쉽군요"); } } } } public static void main(String[] args) { new Main(); } } /* Math.random() : 0이상 1미만의 랜덤 실수 0.8 0.12 0.7777 0.99999 Math.random()*5 : 0이상 5미만의 랜덤 실수 (int)(Math.random()*5) : 0이상 5 미만의 랜덤 정수 (int)(Math.random())*5 : 0 (x) */

import javax.swing.*; import java.awt.event.*; import java.awt.*; public class Main extends JFrame { private JLabel la=new JLabel(); public Main() { setTitle("key code 예제:F1키-초록색,%키-노란색"); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); Container c=getContentPane(); c.addKeyListener(new MyKeyListener()); c.add(la); setSize(300,150); setVisible(true); c.setFocusable(true); c.requestFocus(); } class MyKeyListener extends KeyAdapter { public void keyPressed(KeyEvent e) { Container contentPane=(Container)e.getSource(); la.setText(KeyEvent.getKeyText(e.getKeyCode())+"키가 입력되었습니다"); if(e.getKeyChar()=='%') contentPane.setBackground(Color.YELLOW); else if(e.getKeyCode()==KeyEvent.VK_F1) contentPane.setBackground(Color.GREEN); } } public static void main(String[] args) { new Main(); } } import javax.swing.*; import java.awt.event.*; import java.awt.*; public class Main extends JFrame { private final int FLYING_UNIT=10; private JLabel la=new JLabel("HELLO"); public Main() { setTitle("상,하,좌,우 키를 이용하여 텍스트 움직이기"); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); Container c=getContentPane(); c.setLayout(null); c.addKeyListener(new MyKeyListener()); la.setLocation(50,50); la.setSize(100,20); c.add(la); setSize(300,300); setVisible(true); c.setFocusable(true); c.requestFocus(); c.addMouseListener(new MouseAdapter() { public void mouseCliked(MouseEvent e) { Component com=(Component)e.getSource(); com.setFocusable(true); com.requestFocus(); } }); } class MyKeyListener extends KeyAdapter { public void keyPressed(KeyEvent e) { int keyCode=e.getKeyCode(); switch(keyCode) { case KeyEvent.VK_UP: la.setLocation(la.getX(),la.getY()-FLYING_UNIT); break; case KeyEvent.VK_DOWN: la.setLocation(la.getX(),la.getY()+FLYING_UNIT); break; case KeyEvent.VK_LEFT: la.setLocation(la.getX()-FLYING_UNIT,la.getY()); break; case KeyEvent.VK_RIGHT: la.setLocation(la.getX()+FLYING_UNIT,la.getY()); break; } } } public static void main(String[] args) { new Main(); } } */ import javax.swing.*; import java.awt.event.*; import java.awt.*; class Main extends JFrame { JLabel la=new JLabel("C"); public Main() { setTitle("클릭 연습 응용 프로그램"); setSize(300,300); setVisible(true); Container c=getContentPane(); c.setLayout(null); la.setLocation(100,100); la.setSize(10, 10); la.addMouseListener(new MouseAdapter() { public void mouseClicked(MouseEvent e) { int x = (int)(Math.random()*100); int y = (int)(Math.random()*100); la.setLocation(x, y); } }); c.add(la); } public static void main(String[] args) { new Main(); } }

/* import javax.swing.*; import java.awt.event.*; import java.awt.*; public class Main extends JFrame { private JLabel [] keyMessage; public Main() { setTitle("keyListener 예제"); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE ); Container c=getContentPane(); c.setLayout(new FlowLayout()); c.addKeyListener(new MyKeyListener()); keyMessage=new JLabel [3]; keyMessage[0]=new JLabel("getKeyCode()"); keyMessage[1]=new JLabel("getKeyChar()"); keyMessage[2]=new JLabel("getKeyText()"); for(int i=0;i<keyMessage.length;i++) { c.add(keyMessage[i]); keyMessage[i].setOpaque(true); keyMessage[i].setBackground(Color.YELLOW); } setSize(300,150); setVisible(true); c.setFocusable(true); c.requestFocus(); } class MyKeyListener extends KeyAdapter { public void keyPressed(KeyEvent e) { int keyCode=e.getKeyCode(); char keyChar=e.getKeyChar(); keyMessage[0].setText(Integer.toString(keyCode)); keyMessage[1].setText(Character.toString(keyChar)); keyMessage[2].setText(KeyEvent.getKeyText(keyCode)); System.out.println("Keypressed"); } public void keyReleased(KeyEvent e) { System.out.println("keyReleased"); } public void KeyReleased(KeyEvent e) { System.out.println("KeyTyped"); } } public static void main(String[] args) { new Main(); } } */ /* import javax.swing.*; import java.awt.event.*; import java.awt.*; public class Main extends JFrame { private JLabel la= new JLabel(); Container c=getContentPane(); public Main() { setTitle(""); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); c.setLayout(new FlowLayout()); c.add(la); c.addKeyListener(new MyKeyListener()); setSize(300,150); setVisible(true); c.setFocusable(true); c.requestFocus(); } class MyKeyListener extends KeyAdapter { public void keyPressed(KeyEvent e) { la.setText(KeyEvent.getKeyText(e.getKeyCode())+"키가 입력되었음"); int keyCode=e.getKeyCode(); if(keyCode==KeyEvent.VK_F1) { c.setBackground(Color.GREEN); } else if(e.getKeyChar()=='%') { c.setBackground(Color.YELLOW); } } } public static void main(String[] args) { new Main(); } } */ /* import javax.swing.*; import java.awt.event.*; import java.awt.*; public class Main extends JFrame { private JLabel la=new JLabel("HELLO"); Container c=getContentPane(); public Main() { setTitle(""); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); c.setLayout(null); c.add(la); la.setLocation(50,50); la.setSize(100,20); c.addKeyListener(new MyKeyListener()); setSize(300,150); setVisible(true); c.setFocusable(true); c.requestFocus(); } class MyKeyListener extends KeyAdapter { public void keyPressed(KeyEvent e) { int KeyCode=e.getKeyCode(); int x = la.getX(); int y = la.getY(); if(KeyCode==KeyEvent.VK_UP) { la.setLocation(x, y-10); } else if(KeyCode==KeyEvent.VK_DOWN) { la.setLocation(x,y+10); } else if(KeyCode==KeyEvent.VK_LEFT) { la.setLocation(x-10,y); } else if(KeyCode==KeyEvent.VK_RIGHT) { la.setLocation(x+10,y); } } } public static void main(String[] args) { new Main(); } } */ import javax.swing.*; import java.awt.event.*; import java.awt.*; public class Main extends JFrame { Container c=getContentPane(); public Main() { setTitle(""); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); c.setLayout(new FlowLayout()); c.add(); c.addKeyListener(new MyKeyListener()); setSize(300,150); setVisible(true); c.setFocusable(true); c.requestFocus(); } }

import java.awt.*; import java.awt.event.*; import javax.swing.*; public class Main extends JFrame { private JLabel la=new JLabel("Love Java"); public Main() { setTitle(""); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); Container c=getContentPane(); c.setLayout(new FlowLayout()); c.add(la); la.addMouseListener(new MyMouseListener()); setSize(251,251); setVisible(true); } class MyMouseListener extends MouseAdapter{ public void mouseEntered(MouseEvent e) { la.setText("사랑해"); } public void mouseExited(MouseEvent e) { la.setText("Love Java"); } } public static void main(String[] args) { new Main(); } } */ /* import java.awt.*; import java.awt.event.*; import javax.swing.*; public class Main extends JFrame { Container c=getContentPane(); public Main() { setTitle(""); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); c.addMouseMotionListener(new MyMouseListener()); c.addMouseListener(new MyMouseListener()); c.setBackground(Color.green); setSize(250,250); setVisible(true); } class MyMouseListener extends MouseAdapter implements MouseMotionListener { public void mouseDragged(MouseEvent e) { c.setBackground(Color.yellow); } public void mouseMoved(MouseEvent e) { } public void mouseReleased(MouseEvent e) { c.setBackground(Color.green); } } public static void main(String[] args) { new Main(); } } */ /* import java.awt.*; import java.awt.event.*; import javax.swing.*; public class Main extends JFrame { private JLabel la = new JLabel("C"); Container c = getContentPane(); public Main() { setTitle(""); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); c.add(la); la.addMouseListener(new MyMouseListener()); setSize(250, 250); setVisible(true); } class MyMouseListener extends MouseAdapter { public void mouseClicked(MouseEvent e) { int x =(int)(Math.random()*250); int y =(int)(Math.random()*250); la.setLocation(x, y); } } public static void main(String[] args) { new Main(); } } */

/* import java.awt.*; import java.awt.event.*; import javax.swing.*; public class Main extends JFrame { public Main() { setTitle("Action 이벤트 리스너 예제"); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); Container c=getContentPane(); c.setLayout(new FlowLayout()); JButton btn=new JButton("Action"); btn.addActionListener(new MyActionListener()); c.add(btn); setSize(350,150); setVisible(true); } public static void main(String[] args) { new Main(); } } class MyActionListener implements ActionListener { public void actionPerformedd(ActionEvent e) { JButton b=(JButton)e.getSource(); if(b.getText().equals("Action")) b.setText("액션"); else b.setText("Action"); } } */

//이벤트 리스너 import javax.swing.*; import java.awt.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; public class Main extends JFrame { JTextField te=new JTextField(15); public Main() { setSize(300,300); setVisible(true); Container c=getContentPane(); c.setLayout(new BorderLayout()); //North Panel JPanel p1=new JPanel(); p1.setBackground(Color.LIGHT_GRAY); c.add(p1,BorderLayout.NORTH); JLabel la=new JLabel("수식입력"); p1.add(la); p1.add(te); //Center Panel JPanel p2=new JPanel(); p2.setBackground(Color.WHITE); p2.setLayout(new GridLayout(4,4)); c.add(p2,BorderLayout.CENTER); for(int i=0;i<=9;i++) { String si= Integer.toString(i); JButton b1=new JButton(si); b1.addActionListener(new MyActionListener()); ////액션리스너 객체 붙여주기 p2.add(b1); } p2.add(new JButton("CE")); p2.add(new JButton("계산")); p2.add(new JButton("+")); p2.add(new JButton("-")); p2.add(new JButton("x")); p2.add(new JButton("/")); //South Panel JPanel p3=new JPanel(); p3.setBackground(Color.YELLOW); c.add(p3,BorderLayout.SOUTH); JLabel la2=new JLabel("계산결과"); p3.add(la2); JTextField te2= new JTextField(15); p3.add(te2); } class MyActionListener implements ActionListener{ public void actionPerformed(ActionEvent e) { // e : 이벤트에 대한 정보가 들어있는 객체 ( 어디서? 언제? .. ) JButton b = (JButton)e.getSource(); //b : 이벤트가 일어난 버튼 //숫자 버튼을 누르면, 수식입력 옆의 텍스트필드에 그 숫자가 출력되도록 ( hint. te.setText("??")) String a = te.getText(); String c = b.getText(); te.setText(a+c); if(te.getText().length()==10) te.setText(" "); //눌린 버튼의 숫자가 홀수이면 글자색을 red로, 짝수이면 blue로 변경 //System.out.println(b.getText()); // int num = Integer.valueOf(b.getText()); // if(num%2==0) { // b.setForeground(Color.blue); // } // else { // b.setForeground(Color.red); // } // if(b.getBackground().equals(Color.blue)) b.setBackground(Color.red); // else b.setBackground(Color.blue); } } public static void main(String[] args) { Main frame=new Main(); } } */

//1. 함수 -> 메소드 // 자동완성 ctrl + space // 컴파일 ctrl + F11 // 자동 정렬 ctrl + shift + f /* import java.util.*; public class Main { //메인 클래스 public static void main(String[] args) { // 자료형 int a=10; long b; //long long int 아님 주의!1 float c; double d; char e; //문자 String f="love";//문자열 //출력 syso + ctrl +space //System.out.println("hello"); //System.out.println("hello "+a); //입력 Scanner 객체 생성 Scanner sc = new Scanner(System.in); int x = sc.nextInt(); System.out.println(x); float y = sc.nextFloat(); System.out.println(y); String s = sc.next(); System.out.println(s); String t = sc.nextLine(); // 한 줄 } } */ /* import java.util.*; public class Main { public static void main(String[] args) { Scanner sc = new Scanner(System.in); int a=sc.nextInt(); System.out.println(a); } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc = new Scanner(System.in); float a=sc.nextFloat(); System.out.printf("%.6f",a); } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); int a=sc.nextInt(); System.out.print(a+" "+a+" "+a); } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); float a=sc.nextFloat(); float b=sc.nextFloat(); System.out.printf("%.2f",a*b); } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); int a=sc.nextInt(); int b=sc.nextInt(); System.out.printf("%.1f",a*b/2.0); } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); int a=sc.nextInt(); if(50<=a&&a<=70||a%6==0){ System.out.println("win"); } else{ System.out.println("lose"); } } } */ /* import java.util.*; public class Main { public static void main(String[] args) { Scanner sc = new Scanner(System.in); int a = sc.nextInt(); int b = sc.nextInt(); if (b >= 30) { b -= 30; } else if (a != 0) { a--; b += 30; } else { a = 23; b += 30; } System.out.println(a + " " + b); } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); int a=sc.nextInt(); int b=sc.nextInt(); int c=sc.nextInt(); if(170<a&&170<b&&170<c) { System.out.println("PASS"); } else if(170>=a){ System.out.println("CRASH "+a); } else if(170>=b){ System.out.println("CRASH "+b); } else{ System.out.println("CRASH "+c); } } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); int a=sc.nextInt(); int b=sc.nextInt(); int c=sc.nextInt(); int n=sc.nextInt(); for(int i=1;i<n;i++) { a=a*b+c; } System.out.println(a); } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); int a=sc.nextInt(); int b=sc.nextInt(); for(int i=a;i<=b;i++) { for(int j=1;j<=9;j++) { System.out.printf("%d*%d=%d\n",i,j,i*j); } } } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); int n=sc.nextInt(); for(int i=n-1;i>=0;i--) { for(int j=1;j<=i;j++) { System.out.print(" "); } for(int j=1;j<=n;j++) { System.out.print("*"); } System.out.println(); } } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); int n=sc.nextInt(); for(int i=n-1;i>=0;i--) { for(int j=1;j<=i;j++) { System.out.print(" "); } for(int j=1;j<=n;j++) { System.out.print("*"); } System.out.println(); } } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); int n = sc.nextInt(); int arr[] = new int[n]; for(int i=0;i<n;i++){ arr[i]=sc.nextInt(); } for(int i=0;i<n;i++){ for(int j=i;j<n;j++){ System.out.print(arr[j]+" "); } for(int j=0;j<=i-1;j++) { System.out.print(arr[j]+" "); } System.out.println(); } } } import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); int arr[]=new int[10]; for(int i=0;i<10;i++) { arr[i]=sc.nextInt(); } int k=sc.nextInt(); System.out.println(arr[k-1]); } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); String str = sc.nextLine(); for(int i=0;i<str.length();i++) { System.out.print(str.charAt(i)+" "); } } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); String str=sc.next(); for(int i=0;i<str.length();i++) { System.out.println("'"+str.charAt(i)+"'"); } } } */ /* import java.util.*; public class Main { public static void main(String[] args) { Scanner sc = new Scanner(System.in); String s1 = sc.next(); String s2 = sc.next(); String s3 = sc.next(); if (s1.charAt(s1.length() - 1) == s2.charAt(0)&&s2.charAt(s2.length() - 1) == s3.charAt(0)&&s3.charAt(s3.length() - 1) == s1.charAt(0)) { System.out.println("good"); } else { System.out.println("bad"); } } } 클래스 : 틀 필드 + 메소드(함수) + 생성자 객체 : 클래스로 찍어낸 것 들.. import java.util.*; class Person{ //field 필드 int age; String name; //메소드 void speak() { System.out.println(age+" ,hi im "+name+"..."); } void sleep() { } } public class Main{ public static void main(String[] args) { Person a = new Person(); //a 객체 생성 Person b = new Person(); a.age=10; a.name="james"; a.speak(); b.age=30; b.name = "Mark"; b.speak(); } } */ /* import java.util.*; class Circle{ int radius; String name; //생성자 - 객체를 생성할때, 필드의 초깃값 설정 public Circle(int radius) { this.radius=radius; } public Circle(int radius, String name) { this.radius=radius; this.name=name; } public double getArea() { return 3.14*radius*radius; } } public class Main{ public static void main(String[] args) { Circle pizza=new Circle(10,"A"); double area =pizza.getArea(); System.out.println(pizza.name+"의 면적은"+area); Circle donut=new Circle(2); // donut.radius=2; // donut.name="B"; // area=donut.getArea(); // System.out.println(donut.name+"의 면적은"+area); } } */ /* class Circle { int radius; String name; public Circle() { radius = 1; name = ""; } public Circle(int r, String n) { radius = r; name = n; } public double getArea() { return 3.14 * radius * radius; } } class Main { public static void main(String[] args) { Circle pizza = new Circle(10, "A"); double area = pizza.getArea(); System.out.println(pizza.name + "의 면적은" + area); } } */ /* import java.util.*; class Song { String title; public Song(String title) { this.title=title; } public String gettitle() { return title; } } public class Main{ public static void main(String[] args) { Song mysong=new Song("Nessun Dorma"); Song yoursong= new Song("공주는 잠 못 이루고"); System.out.println("네 노래는 "+ mysong.gettitle()); System.out.println("너 노래는 "+yoursong.gettitle()); } } 접근지정자 public 다른 모든 클래스에서 접근 가능 private 그 클래스 내부에서만 접근 가능 */ /* import java.util.*; class Phone { private String tel, name; public Phone(String tel, String name) { this.tel = tel; this.name = name; } public String getName(){ return name; } public String getTel() { return tel; } } public class Main { public static void main(String[] args) { Scanner sc=new Scanner(System.in); int arr[50]; (X) int arr[] = new int [50]; //(o) //객체배열생성시 두번 해야한다 Phone parr[] = new Phone[50]; //레퍼런스변수 생성 for(int i=0; i<parr.length; i++) { String name = sc.next(); String tel =sc.next(); parr[i] = new Phone(tel,name); //객체생성 } System.out.print("이름과 전화번호 입력 >>"); String name = sc.next(); String tel =sc.next(); Phone mytel = new Phone(tel,name); System.out.println("이름과 전화번호 입력 >>"); String name1=sc.next(); String tel1=sc.next(); Phone yourtel=new Phone(tel1,name1); System.out.println(mytel.name+"의 번호"+mytel.tel); System.out.println(mytel.getName()+"의 번호"+mytel.getTel()); System.out.println(yourtel.getName()+"의 번호"+yourtel.getTel()); } } */ /* import java.util.*; class Book{ String title,author; public Book(String title,String author) { this.title=title; this.author=author; } } public class Main{ public static void main(String[] args) { Book[]book=new Book[2]; Scanner sc=new Scanner(System.in); for(int i=0;i<book.length;i++) { System.out.println("제목>>"); String title=sc.nextLine(); System.out.print("저자>>"); String author=sc.nextLine(); book[i]=new Book(title,author); } } } */ /* import java.util.*; class Rect{ private int width,height; public Rect(int width,int height) { this.width=width; this.height=height; } public int getArea() {return width*height;} } public class Main{ public static void main(String[] args) { Rect[]rect= new Rect[4]; Scanner sc=new Scanner(System.in); for(int i=0;i<rect.length;i++) { System.out.print(i+1); System.out.print(" 너비와 높이 >>"); int width=sc.nextInt(); int height=sc.nextInt(); rect[i] = new Rect(width,height); } int sum=0; for(int i=0;i<rect.length;i++) { sum=sum+rect[i].getArea(); } System.out.print("저장하였습니다..."); System.out.println("사각형의 전체 합은 "+sum); } } */ /* import java.util.*; class Phone { private String name, tel; public Phone(String name, String tel) { this.name = name; this.tel = tel; } public String getname() {return name;} public String gettel() {return tel;} } public class Main { public static void main(String[] args) { Scanner sc=new Scanner(System.in); //1. System.out.print("인원수>>"); int n = sc.nextInt(); Phone[] phone= new Phone[n]; //2. for(int i=0;i<phone.length;i++) { System.out.print("이름과 전화번호(번호는 연속적으로 입력)>>"); String name=sc.next(); String tel=sc.next(); phone[i]=new Phone(name,tel); } System.out.println("저장되었습니다..."); //3. while(true) { System.out.print("검색할이름>>"); String name = sc.next(); int flag=0; for(int i=0;i<phone.length;i++) { if(name.equals(phone[i].getname())) { flag=1; System.out.println(name+" 의 번호는 " +phone[i].gettel()+" 입니다."); break; } } if(flag==0) { System.out.println(name+" 이 없습니다."); } if(name.equals("exit")) break; } System.out.println("프로그램을 종료합니다..."); } } */ /* import java.util.*; class Point { private int x,y; public Point(int x,int y) {this.x=x;this.y=y;} public int getX() {return x;} public int getY() {return y;} protected void move(int x,int y) {this.x=x;this.y=y;} } class ColorPoint extends Point{ private String color; public ColorPoint(int x,int y,String color) { super(x,y); this.color=color; } public void setPoint(int x,int y){ move(x,y); } public void setColor(String color) { this.color=color; } public void show() { System.out.println(color+"색으로"+"("+getX()+","+getY()+")"); } } class Main{ public static void main(String[] args) { ColorPoint cp=new ColorPoint(5,5,"YELLOW"); //ColorPoint 객체 생성 cp.setPoint(10, 20); cp.setColor("GREEN"); cp.show(); } } class abstract class 추상클래스 (일부만 작성된 클래스) interface 인터페이스 (틀만 있는 클래스) import java.util.*; interface StackInterface { int length(); //추상메소드 (내용이 작성이 안된 메소드) String pop(); boolean push(String ob); } class StringStack implements StackInterface { private int top=-1; //top이 마지막 데이터의 위치 String stack[] = new String[5]; //추상메소드들 구현 public int length() { return top+1; } public String pop() { return stack[top--]; } public boolean push(String ob) { if(top!=4){ top++; stack[top]=ob; return true; } else return false; } } class Main { public static void main(String[] args) { Scanner sc=new Scanner(System.in); StringStack cp=new StringStack(); for(int i=0;i<5;i++) { String str = sc.next(); cp.push(str); } for(int i=0;i<5;i++) { System.out.print(cp.pop()+" "); } } } import java.util.*; interface Shape { final double PI=3.14; void draw(); double getArea(); default public void redraw() { System.out.println("--- 다시 그립니다. ---"); draw(); } } class Circle implements Shape { private int radius; public Circle (int radius) { this.radius=radius; } public void draw() { System.out.print("반지름 "+radius); } public double getArea() { return radius*radius*PI; } } public class Main { public static void main(String[] args) { Shape coin=new Circle(10); coin.redraw(); System.out.print(" 코인의 면적은"+coin.getArea()); } GUI GRAPHIC USER INTERFACE 그래픽으로 컴퓨터랑 소통하기 컴포넌트 - Button, TextField, JLabel 컨테이너 - Frame, Panel, contain(포함하다) +er import java.awt.*; import javax.swing.*; public class Main extends JFrame { public Main() { //기본 셋팅 setSize(1000,300); setVisible(true); //프레임 이름지어주기 Container c = getContentPane(); c.setBackground(Color.yellow); // 배경색 설정 //layout 레이아웃 : 배치관리자 c.setLayout(new FlowLayout()); //컨테이너에 컴포넌트 추가 방법1 JButton b1 = new JButton("예준1"); b1.setBackground(Color.green); //버튼의 배경색 설정 b1.setForeground(Color.white); //버튼의 글자색 설정 c.add(b1); //컨테이너에 컴포넌트 추가 방법2 c.add(new JButton("예준2")); JLabel la = new JLabel("라벨입니다"); c.add(la); } public static void main(String[] args) { Main frame=new Main(); } } 문제 1 가로 500픽셀 세로 300픽셀 컨테이너 배경색은 white 라벨, 버튼, 버튼 라벨 "label" 글자색은 red 버튼 "버튼1" 배경색은 green 글자색 white 버튼 "버튼2" 배경색은 blue 글자색 white import javax.swing.*; import java.awt.*; public class Main extends JFrame { public Main() { setSize(300,500); setVisible(true); Container c=getContentPane(); c.setLayout(new FlowLayout()); c.setBackground(Color.white); JLabel la=new JLabel("label"); la.setForeground(Color.red); c.add(la); JButton b1=new JButton("버튼1"); b1.setBackground(Color.green); b1.setForeground(Color.white); c.add(b1); JButton b2=new JButton("버튼2"); b2.setBackground(Color.blue); b2.setForeground(Color.white); c.add(b2); } public static void main(String[] args) { Main frame=new Main(); } } c.setLayout(null); c.setBackground(Color.white); JLabel la=new JLabel("label-0"); la.setForeground(Color.red); la.setSize(50,50); la.setLocation(100,50); c.add(la); layout(배치관리자) 1. flowlayout : 그냥 적당히 알아서 순서대로 위치, 사이즈 지정 (내가 위치와 사이즈를 정할 수 없다) 2. null : 배치관리자가 아예 없다. 꼭 사이즈와 위치를 지정해주어야 한다. 3. gridlayout : 이차원배열 형태로 순서대로 집어넣어준다 (내가 위치와 사이즈를 정할 수 없다) 4. BorderLayout : 동서남북중앙 import javax.swing.*; import java.awt.*; public class Main extends JFrame { public Main() { setSize(500,300); setVisible(true); Container c=getContentPane(); c.setLayout(new BorderLayout()); JPanel p1 = new JPanel(); p1.setBackground(Color.red); c.add(p1,BorderLayout.CENTER); p1.setLayout(null); JButton b1 = new JButton("center button"); b1.setSize(200, 100); b1.setLocation(100, 100); p1.add(b1); JPanel p2 = new JPanel(); p2.setBackground(Color.white); c.add(p2,BorderLayout.NORTH); p2.add(new JButton("north button")); p2.add(new JButton("north button")); // JButton b1 = new JButton("button1"); // c.add(b1,BorderLayout.EAST); // JButton b2 = new JButton("button2"); // c.add(b2,BorderLayout.CENTER); // JButton b3 = new JButton("button3"); // c.add(b3,BorderLayout.WEST); // for(int i=0;i<6;i++) { // JButton b = new JButton("button"+i); // c.add(b); // } } public static void main(String[] args) { Main frame=new Main(); } } */ /* import javax.swing.*; import java.awt.*; public class Main extends JFrame { public Main() { setSize(400,400); setVisible(true); Container c=getContentPane(); c.setLayout(new BorderLayout(7,5)); JButton b1=new JButton("North"); c.add(b1,BorderLayout.NORTH); JButton b2=new JButton("West"); c.add(b2,BorderLayout.WEST); JButton b5=new JButton("Center"); c.add(b5,BorderLayout.CENTER); JButton b3=new JButton("South"); c.add(b3,BorderLayout.SOUTH); JButton b4=new JButton("East"); c.add(b4,BorderLayout.EAST); } public static void main(String[] args) { Main frame=new Main(); } } */ /* import javax.swing.*; import java.awt.*; public class Main extends JFrame { public Main() { setSize(800,400); setVisible(true); Container c=getContentPane(); c.setLayout(new GridLayout(1,10)); for(int i=0;i<10;i++) { String si = Integer.toString(i); //정수를 문자열로 변환할때 쓰임!!! 꼭 기억하기!!! JButton b=new JButton(si); c.add(b); } } public static void main(String[] args) { Main frame=new Main(); } }*/ //527p import javax.swing.*; import java.awt.*; public class Main extends JFrame { public Main() { setSize(500,600); setVisible(true); Container c=getContentPane(); c.setLayout(new BorderLayout()); JPanel p1=new JPanel(); p1.setBackground(Color.gray); c.add(p1,BorderLayout.NORTH); JPanel p2=new JPanel(); p2.setBackground(Color.lightGray); c.add(p2,BorderLayout.CENTER); } public static void main(String[] args) { Main frame=new Main(); } }

import java.util.*; class Point { private int x,y; public Point(int x,int y) {this.x=x;this.y=y;} public int getX() {return x;} public int getY() {return y;} protected void move(int x,int y) {this.x=x;this.y=y;} } class ColorPoint extends Point{ private String color; public ColorPoint(int x,int y,String color) { super(x,y); this.color=color; } public void setPoint(int x,int y){ move(x,y); } public void setColor(String color) { this.color=color; } public void show() { System.out.println(color+"색으로"+"("+getX()+","+getY()+")"); } } class Main{ public static void main(String[] args) { ColorPoint cp=new ColorPoint(5,5,"YELLOW"); //ColorPoint 객체 생성 cp.setPoint(10, 20); cp.setColor("GREEN"); cp.show(); } } class abstract class 추상클래스 (일부만 작성된 클래스) interface 인터페이스 (틀만 있는 클래스) import java.util.*; interface StackInterface { int length(); //추상메소드 (내용이 작성이 안된 메소드) String pop(); boolean push(String ob); } class StringStack implements StackInterface { private int top=-1; //top이 마지막 데이터의 위치 String stack[] = new String[5]; //추상메소드들 구현 public int length() { return top+1; } public String pop() { return stack[top--]; } public boolean push(String ob) { if(top!=4){ top++; stack[top]=ob; return true; } else return false; } } class Main { public static void main(String[] args) { Scanner sc=new Scanner(System.in); StringStack cp=new StringStack(); for(int i=0;i<5;i++) { String str = sc.next(); cp.push(str); } for(int i=0;i<5;i++) { System.out.print(cp.pop()+" "); } } } import java.util.*; interface Shape { final double PI=3.14; void draw(); double getArea(); default public void redraw() { System.out.println("--- 다시 그립니다. ---"); draw(); } } class Circle implements Shape { private int radius; public Circle (int radius) { this.radius=radius; } public void draw() { System.out.print("반지름 "+radius); } public double getArea() { return radius*radius*PI; } } public class Main { public static void main(String[] args) { Shape coin=new Circle(10); coin.redraw(); System.out.print(" 코인의 면적은"+coin.getArea()); } */}

/* import java.util.*; class Player { String name; String word; public Player(String name) { this.name=name; } void getWordFromUser() { Scanner sc=new Scanner(System.in); System.out.print(name+">>"); String word = sc.next(); //현재단어 } boolean checkSuccess(String prevWord) { int LastIndex=prevWord.length()-1; char lastChar=prevWord.charAt(LastIndex); char firstChar=word.charAt(0); if(lastChar!=firstChar) return false; else return true; } } public class Main { public static void main(String[] args) { Main m = new Main(); m.run(); } void run() { Scanner sc=new Scanner(System.in); System.out.print("게임에 참가하는 인원은 몇명입니까>>"); int n = sc.nextInt(); //Player객체 배열 n개 Player p[] = new Player[n]; for(int i=0;i<n;i++) { System.out.println("참가자의 이름을 입력하세요>>"); String name = sc.next(); p[i] = new Player(name); } //게임 시작 System.out.println("시작하는 단어는 아버지 입니다"); String word = "아버지"; while(true) { for(int i=0;i<n;i++) { word = p[i].getWordFromUser(); p[i].checkSuccess(prevWord) } } } } */ /* */ /* import java.util.*; class Player { private String name; public Player(String name) {this.name=name;} public String getName() {return name;} } public class Main{ public static void main(String[] args) { Scanner scanner=new Scanner(System.in); Player [] p=new Player[2]; for(int i=0;i<2;i++) { System.out.println("선수 이름 입력"); p[i] =new Player(scanner.next()); } int n=0; while(true) { System.out.print(p[n].getName()+"<Enter 외 아무거나 치세요>"); scanner.next(); int [] val=new int[3]; for(int i=0;i<val.length;i++) { val[i] =(int)(Math.random()*3); System.out.print(val[i]+"\t"); } System.out.println(); if(val[0]==val[1]&&val[1]==val[2]) { System.out.println(p[n].getName()+"이 승리하였습니다"); break; } n++; n=n%2; } } } import java.util.*; 슈퍼클래스 부모클래스 서브클래스 자식클래스 상속 extends class Person{ String name; int age; void speak() { System.out.println("안녕하세요 저는 사람입니다"); } } class Student extends Person{ char grade; } class Teacher extends Person{ String sub; } class El_Student extends Student{ } class Main{ public static void main(String[] args) { //Person p = new Person(); Student s = new Student(); s.name="스폰지밥"; } } */ /* class Point { private int x,y; public void set(int x,int y) { this.x=x; this.y=y; } public void showPoint() { System.out.println("("+x+","+y+")"); } } class ColorPoint extends Point { private String color; public void setColor(String Color) { this.color=Color; } public void showColorPoint() { System.out.println(color); showPoint(); } } public class Main { public static void main(String[]args) { Point p=new Point(); p.set(1,2); p.showPoint(); ColorPoint cp=new ColorPoint(); cp.set(3, 4); cp.setColor("red"); cp.showColorPoint(); } }*/ /* class Point { private int x, y; public void set(int x, int y) { this.x = x; this.y = y; } public void showPoint() { System.out.println("("+x+","+y+")"); } } class ColorPoint extends Point { private String color; public void setColor(String color) { this.color=color; } public void showColorPoint() { System.out.println(color); showPoint(); } } public class Main { public static void main(String[]args) { Point P=new Point(); P.set(1,2); P.showPoint(); ColorPoint cp=new ColorPoint(); cp.set(3, 4); cp.setColor("red"); cp.showColorPoint(); } } */ /* class point { private int x,y; public point() { this.x=this.y=0; } public point(int x,int y) { this.x=x;this.y=y; } public void showPoint() { System.out.println("("+x+","+y+")"); } } class ColorPoint extends point { private String color; public ColorPoint(int x,int y,String color) { super(x,y); this.color=color; } public void showColorPoint() { System.out.println(color); showPoint(); } } public class Main { public static void main(String[]args) { ColorPoint cp=new ColorPoint(5,6,"blue"); cp.showColorPoint(); } } 추상클래스 (틀만있고, 객체는 생성할수없는 클래스) */ //abstract class Circle { // private int radius; // // public Circle(int radius) { // this.radius = radius; // } // // public int getRadius() { // return radius; // } // // public abstract void show(); //추상메소드 //} /* interface Circle{ abstract int getRadius(); //추상메소드 } //class NamedCircle extends Circle { class NamedCircle implements Circle { private String name; public NamedCircle(int radius, String name) { super(radius); this.name = name; } public void show() { System.out.println(name + ", radius =" + getRadius()); } } public class Main { public static void main(String[] args) { NamedCircle w = new NamedCircle(5, "waffle"); w.show(); } } */ /* interface AdderInterface { int add(int x, int y); int add(int n); } class MyAdder implements AdderInterface { public int add(int x, int y) { return x + y; } public int add(int n) { int sum = 0; for (int i = 1; i <= n; i++) { sum = sum + i; } return sum; } } class Main { public static void main(String[] args) { MyAdder adder = new MyAdder(); System.out.println(adder.add(5, 10)); System.out.println(adder.add(10)); } }*/ import java.util.*; abstract class Calculator { protected int a,b; abstract protected int calc(); protected void input() { Scanner scanner=new Scanner(System.in); System.out.println("정수 2개를 입력하세요>>"); a=scanner.nextInt(); b=scanner.nextInt(); } public void run() { input(); int res=calc(); System.out.println("계산된 값은"+res); } } class Adder extends Calculator { protected int calc() { return a+b; } } class Subtracter extends Calculator { protected int calc() { return a-b; } } public class Main { public static void main(String[]args) { Adder adder =new Adder(); Subtracter sub=new Subtracter(); adder.run(); sub.run(); } }

/* import java.util.*; class Player { String name; String word; public Player(String name) { this.name=name; } void getWordFromUser() { Scanner sc=new Scanner(System.in); System.out.print(name+">>"); String word = sc.next(); //현재단어 } boolean checkSuccess(String prevWord) { int LastIndex=prevWord.length()-1; char lastChar=prevWord.charAt(LastIndex); char firstChar=word.charAt(0); if(lastChar!=firstChar) return false; else return true; } } public class Main { public static void main(String[] args) { Main m = new Main(); m.run(); } void run() { Scanner sc=new Scanner(System.in); System.out.print("게임에 참가하는 인원은 몇명입니까>>"); int n = sc.nextInt(); //Player객체 배열 n개 Player p[] = new Player[n]; for(int i=0;i<n;i++) { System.out.println("참가자의 이름을 입력하세요>>"); String name = sc.next(); p[i] = new Player(name); } //게임 시작 System.out.println("시작하는 단어는 아버지 입니다"); String word = "아버지"; while(true) { for(int i=0;i<n;i++) { word = p[i].getWordFromUser(); p[i].checkSuccess(prevWord) } } } } */ /* */ /* import java.util.*; class Player { private String name; public Player(String name) {this.name=name;} public String getName() {return name;} } public class Main{ public static void main(String[] args) { Scanner scanner=new Scanner(System.in); Player [] p=new Player[2]; for(int i=0;i<2;i++) { System.out.println("선수 이름 입력"); p[i] =new Player(scanner.next()); } int n=0; while(true) { System.out.print(p[n].getName()+"<Enter 외 아무거나 치세요>"); scanner.next(); int [] val=new int[3]; for(int i=0;i<val.length;i++) { val[i] =(int)(Math.random()*3); System.out.print(val[i]+"\t"); } System.out.println(); if(val[0]==val[1]&&val[1]==val[2]) { System.out.println(p[n].getName()+"이 승리하였습니다"); break; } n++; n=n%2; } } } import java.util.*; 슈퍼클래스 부모클래스 서브클래스 자식클래스 상속 extends class Person{ String name; int age; void speak() { System.out.println("안녕하세요 저는 사람입니다"); } } class Student extends Person{ char grade; } class Teacher extends Person{ String sub; } class El_Student extends Student{ } class Main{ public static void main(String[] args) { //Person p = new Person(); Student s = new Student(); s.name="스폰지밥"; } } */ class Point { private int x,y; public void set(int x,int y) { this.x=x; this.y=y; } public void showPoint() { System.out.println("("+x+","+y+")"); } } class ColorPoint extends Point { private String color; public void setColor(String Color) { this.color=Color; } public void showColorPoint() { System.out.println(color); showPoint(); } } public class Main { public static void main(String[]args) { Point p=new Point(); p.set(1,2); p.showPoint(); ColorPoint cp=new ColorPoint(); cp.set(3, 4); cp.setColor("red"); cp.showColorPoint(); } }

import java.util.*; class Phone { private String name, tel; public Phone(String name, String tel) { this.name = name; this.tel = tel; } public String getname() {return name;} public String gettel() {return tel;} } public class Main { public static void main(String[] args) { Scanner sc=new Scanner(System.in); //1. System.out.print("인원수>>"); int n = sc.nextInt(); Phone[] phone= new Phone[n]; //2. for(int i=0;i<phone.length;i++) { System.out.print("이름과 전화번호(번호는 연속적으로 입력)>>"); String name=sc.next(); String tel=sc.next(); phone[i]=new Phone(name,tel); } System.out.println("저장되었습니다..."); //3. while(true) { System.out.print("검색할이름>>"); String name = sc.next(); int flag=0; for(int i=0;i<phone.length;i++) { if(name.equals(phone[i].getname())) { flag=1; System.out.println(name+" 의 번호는 " +phone[i].gettel()+" 입니다."); break; } } if(flag==0) { System.out.println(name+" 이 없습니다."); } if(name.equals("exit")) break; } System.out.println("프로그램을 종료합니다..."); } }

//1. 함수 -> 메소드 // 자동완성 ctrl + space // 컴파일 ctrl + F11 // 자동 정렬 ctrl + shift + f /* import java.util.*; public class Main { //메인 클래스 public static void main(String[] args) { // 자료형 int a=10; long b; //long long int 아님 주의!1 float c; double d; char e; //문자 String f="love";//문자열 //출력 syso + ctrl +space //System.out.println("hello"); //System.out.println("hello "+a); //입력 Scanner 객체 생성 Scanner sc = new Scanner(System.in); int x = sc.nextInt(); System.out.println(x); float y = sc.nextFloat(); System.out.println(y); String s = sc.next(); System.out.println(s); String t = sc.nextLine(); // 한 줄 } } */ /* import java.util.*; public class Main { public static void main(String[] args) { Scanner sc = new Scanner(System.in); int a=sc.nextInt(); System.out.println(a); } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc = new Scanner(System.in); float a=sc.nextFloat(); System.out.printf("%.6f",a); } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); int a=sc.nextInt(); System.out.print(a+" "+a+" "+a); } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); float a=sc.nextFloat(); float b=sc.nextFloat(); System.out.printf("%.2f",a*b); } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); int a=sc.nextInt(); int b=sc.nextInt(); System.out.printf("%.1f",a*b/2.0); } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); int a=sc.nextInt(); if(50<=a&&a<=70||a%6==0){ System.out.println("win"); } else{ System.out.println("lose"); } } } */ /* import java.util.*; public class Main { public static void main(String[] args) { Scanner sc = new Scanner(System.in); int a = sc.nextInt(); int b = sc.nextInt(); if (b >= 30) { b -= 30; } else if (a != 0) { a--; b += 30; } else { a = 23; b += 30; } System.out.println(a + " " + b); } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); int a=sc.nextInt(); int b=sc.nextInt(); int c=sc.nextInt(); if(170<a&&170<b&&170<c) { System.out.println("PASS"); } else if(170>=a){ System.out.println("CRASH "+a); } else if(170>=b){ System.out.println("CRASH "+b); } else{ System.out.println("CRASH "+c); } } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); int a=sc.nextInt(); int b=sc.nextInt(); int c=sc.nextInt(); int n=sc.nextInt(); for(int i=1;i<n;i++) { a=a*b+c; } System.out.println(a); } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); int a=sc.nextInt(); int b=sc.nextInt(); for(int i=a;i<=b;i++) { for(int j=1;j<=9;j++) { System.out.printf("%d*%d=%d\n",i,j,i*j); } } } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); int n=sc.nextInt(); for(int i=n-1;i>=0;i--) { for(int j=1;j<=i;j++) { System.out.print(" "); } for(int j=1;j<=n;j++) { System.out.print("*"); } System.out.println(); } } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); int n=sc.nextInt(); for(int i=n-1;i>=0;i--) { for(int j=1;j<=i;j++) { System.out.print(" "); } for(int j=1;j<=n;j++) { System.out.print("*"); } System.out.println(); } } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); int n = sc.nextInt(); int arr[] = new int[n]; for(int i=0;i<n;i++){ arr[i]=sc.nextInt(); } for(int i=0;i<n;i++){ for(int j=i;j<n;j++){ System.out.print(arr[j]+" "); } for(int j=0;j<=i-1;j++) { System.out.print(arr[j]+" "); } System.out.println(); } } } import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); int arr[]=new int[10]; for(int i=0;i<10;i++) { arr[i]=sc.nextInt(); } int k=sc.nextInt(); System.out.println(arr[k-1]); } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); String str = sc.nextLine(); for(int i=0;i<str.length();i++) { System.out.print(str.charAt(i)+" "); } } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); String str=sc.next(); for(int i=0;i<str.length();i++) { System.out.println("'"+str.charAt(i)+"'"); } } } */ /* import java.util.*; public class Main { public static void main(String[] args) { Scanner sc = new Scanner(System.in); String s1 = sc.next(); String s2 = sc.next(); String s3 = sc.next(); if (s1.charAt(s1.length() - 1) == s2.charAt(0)&&s2.charAt(s2.length() - 1) == s3.charAt(0)&&s3.charAt(s3.length() - 1) == s1.charAt(0)) { System.out.println("good"); } else { System.out.println("bad"); } } } 클래스 : 틀 필드 + 메소드(함수) + 생성자 객체 : 클래스로 찍어낸 것 들.. import java.util.*; class Person{ //field 필드 int age; String name; //메소드 void speak() { System.out.println(age+" ,hi im "+name+"..."); } void sleep() { } } public class Main{ public static void main(String[] args) { Person a = new Person(); //a 객체 생성 Person b = new Person(); a.age=10; a.name="james"; a.speak(); b.age=30; b.name = "Mark"; b.speak(); } } */ /* import java.util.*; class Circle{ int radius; String name; //생성자 - 객체를 생성할때, 필드의 초깃값 설정 public Circle(int radius) { this.radius=radius; } public Circle(int radius, String name) { this.radius=radius; this.name=name; } public double getArea() { return 3.14*radius*radius; } } public class Main{ public static void main(String[] args) { Circle pizza=new Circle(10,"A"); double area =pizza.getArea(); System.out.println(pizza.name+"의 면적은"+area); Circle donut=new Circle(2); // donut.radius=2; // donut.name="B"; // area=donut.getArea(); // System.out.println(donut.name+"의 면적은"+area); } } */ /* class Circle { int radius; String name; public Circle() { radius = 1; name = ""; } public Circle(int r, String n) { radius = r; name = n; } public double getArea() { return 3.14 * radius * radius; } } class Main { public static void main(String[] args) { Circle pizza = new Circle(10, "A"); double area = pizza.getArea(); System.out.println(pizza.name + "의 면적은" + area); } } */ /* import java.util.*; class Song { String title; public Song(String title) { this.title=title; } public String gettitle() { return title; } } public class Main{ public static void main(String[] args) { Song mysong=new Song("Nessun Dorma"); Song yoursong= new Song("공주는 잠 못 이루고"); System.out.println("네 노래는 "+ mysong.gettitle()); System.out.println("너 노래는 "+yoursong.gettitle()); } } */ import java.util.*; class Phone { String name,tel; public Phone(String name,String tel) { this.name=name; this.tel=tel; } public String getName() {return name;} public String gettel() {return tel;} }

//1. 함수 -> 메소드 // 자동완성 ctrl + space // 컴파일 ctrl + F11 // 자동 정렬 ctrl + shift + f /* import java.util.*; public class Main { //메인 클래스 public static void main(String[] args) { // 자료형 int a=10; long b; //long long int 아님 주의!1 float c; double d; char e; //문자 String f="love";//문자열 //출력 syso + ctrl +space //System.out.println("hello"); //System.out.println("hello "+a); //입력 Scanner 객체 생성 Scanner sc = new Scanner(System.in); int x = sc.nextInt(); System.out.println(x); float y = sc.nextFloat(); System.out.println(y); String s = sc.next(); System.out.println(s); String t = sc.nextLine(); // 한 줄 } } */ /* import java.util.*; public class Main { public static void main(String[] args) { Scanner sc = new Scanner(System.in); int a=sc.nextInt(); System.out.println(a); } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc = new Scanner(System.in); float a=sc.nextFloat(); System.out.printf("%.6f",a); } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); int a=sc.nextInt(); System.out.print(a+" "+a+" "+a); } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); float a=sc.nextFloat(); float b=sc.nextFloat(); System.out.printf("%.2f",a*b); } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); int a=sc.nextInt(); int b=sc.nextInt(); System.out.printf("%.1f",a*b/2.0); } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); int a=sc.nextInt(); if(50<=a&&a<=70||a%6==0){ System.out.println("win"); } else{ System.out.println("lose"); } } } */ /* import java.util.*; public class Main { public static void main(String[] args) { Scanner sc = new Scanner(System.in); int a = sc.nextInt(); int b = sc.nextInt(); if (b >= 30) { b -= 30; } else if (a != 0) { a--; b += 30; } else { a = 23; b += 30; } System.out.println(a + " " + b); } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); int a=sc.nextInt(); int b=sc.nextInt(); int c=sc.nextInt(); if(170<a&&170<b&&170<c) { System.out.println("PASS"); } else if(170>=a){ System.out.println("CRASH "+a); } else if(170>=b){ System.out.println("CRASH "+b); } else{ System.out.println("CRASH "+c); } } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); int a=sc.nextInt(); int b=sc.nextInt(); int c=sc.nextInt(); int n=sc.nextInt(); for(int i=1;i<n;i++) { a=a*b+c; } System.out.println(a); } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); int a=sc.nextInt(); int b=sc.nextInt(); for(int i=a;i<=b;i++) { for(int j=1;j<=9;j++) { System.out.printf("%d*%d=%d\n",i,j,i*j); } } } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); int n=sc.nextInt(); for(int i=n-1;i>=0;i--) { for(int j=1;j<=i;j++) { System.out.print(" "); } for(int j=1;j<=n;j++) { System.out.print("*"); } System.out.println(); } } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); int n=sc.nextInt(); for(int i=n-1;i>=0;i--) { for(int j=1;j<=i;j++) { System.out.print(" "); } for(int j=1;j<=n;j++) { System.out.print("*"); } System.out.println(); } } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); int n = sc.nextInt(); int arr[] = new int[n]; for(int i=0;i<n;i++){ arr[i]=sc.nextInt(); } for(int i=0;i<n;i++){ for(int j=i;j<n;j++){ System.out.print(arr[j]+" "); } for(int j=0;j<=i-1;j++) { System.out.print(arr[j]+" "); } System.out.println(); } } } import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); int arr[]=new int[10]; for(int i=0;i<10;i++) { arr[i]=sc.nextInt(); } int k=sc.nextInt(); System.out.println(arr[k-1]); } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); String str = sc.nextLine(); for(int i=0;i<str.length();i++) { System.out.print(str.charAt(i)+" "); } } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); String str=sc.next(); for(int i=0;i<str.length();i++) { System.out.println("'"+str.charAt(i)+"'"); } } } */ /* import java.util.*; public class Main { public static void main(String[] args) { Scanner sc = new Scanner(System.in); String s1 = sc.next(); String s2 = sc.next(); String s3 = sc.next(); if (s1.charAt(s1.length() - 1) == s2.charAt(0)&&s2.charAt(s2.length() - 1) == s3.charAt(0)&&s3.charAt(s3.length() - 1) == s1.charAt(0)) { System.out.println("good"); } else { System.out.println("bad"); } } } */

//1. 함수 -> 메소드 // 자동완성 ctrl + space // 컴파일 ctrl + F11 // 자동 정렬 ctrl + shift + f /* import java.util.*; public class Main { //메인 클래스 public static void main(String[] args) { // 자료형 int a=10; long b; //long long int 아님 주의!1 float c; double d; char e; //문자 String f="love";//문자열 //출력 syso + ctrl +space //System.out.println("hello"); //System.out.println("hello "+a); //입력 Scanner 객체 생성 Scanner sc = new Scanner(System.in); int x = sc.nextInt(); System.out.println(x); float y = sc.nextFloat(); System.out.println(y); String s = sc.next(); System.out.println(s); String t = sc.nextLine(); // 한 줄 } } */ /* import java.util.*; public class Main { public static void main(String[] args) { Scanner sc = new Scanner(System.in); int a=sc.nextInt(); System.out.println(a); } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc = new Scanner(System.in); float a=sc.nextFloat(); System.out.printf("%.6f",a); } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); int a=sc.nextInt(); System.out.print(a+" "+a+" "+a); } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); float a=sc.nextFloat(); float b=sc.nextFloat(); System.out.printf("%.2f",a*b); } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); int a=sc.nextInt(); int b=sc.nextInt(); System.out.printf("%.1f",a*b/2.0); } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); int a=sc.nextInt(); if(50<=a&&a<=70||a%6==0){ System.out.println("win"); } else{ System.out.println("lose"); } } } */ /* import java.util.*; public class Main { public static void main(String[] args) { Scanner sc = new Scanner(System.in); int a = sc.nextInt(); int b = sc.nextInt(); if (b >= 30) { b -= 30; } else if (a != 0) { a--; b += 30; } else { a = 23; b += 30; } System.out.println(a + " " + b); } } */ /* import java.util.*; public class Main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); int a=sc.nextInt(); int b=sc.nextInt(); int c=sc.nextInt(); if(170<a&&170<b&&170<c) { System.out.println("PASS"); } else if(170>=a){ System.out.println("CRASH "+a); } else if(170>=b){ System.out.println("CRASH "+b); } else{ System.out.println("CRASH "+c); } } } */

/* #include <stdio.h> int main() { int i,j,c,r,arr[101][101],num=0; for(i=1; i<=9; i++) { for(j=1; j<=9; j++) { scanf("%d",&arr[i][j]); } } scanf("%d %d",&r,&c); if(arr[r][c]==0) { for(i=r-1;i<=r+1;i++) { for(j=c-1;j<=c+1;j++) { num+=arr[i][j]; } } printf("%d",num); } else { printf("-1"); } } */ /* #include <stdio.h> int main() { int i,j,x,y,n,arr[20][20]={}; scanf("%d",&n); for(i=1;i<=n;i++) { scanf("%d %d",&x,&y); arr[x][y]=1; } for(i=1;i<=19;i++) { for(j=1;j<=19;j++) { printf("%d ",arr[i][j]); } printf("\n"); } } (0+1)%2 1 (1+1)%2 0 */ /* #include <stdio.h> int main() { int i,j,n,x,y,arr[20][20]={}; for(i=1;i<=19;i++) { for(j=1;j<=19;j++) { scanf("%d",&arr[i][j]); } } scanf("%d",&n); for(i=1;i<=n;i++) { scanf("%d %d",&x,&y); for(j=1;j<=19;j++) { arr[x][j]=(arr[x][j]+1)%2; } for(j=1;j<=19;j++) { arr[j][y]=(arr[j][y]+1)%2; } } for(i=1;i<=19;i++) { for(j=1;j<=19;j++) { printf("%d ",arr[i][j]); } printf("\n"); } } */ #include <stdio.h> int main() { int i,j,n,k,arr[100][100]={},a,b,c,d,num=0; for(k=1;k<=4;k++) { scanf("%d %d %d %d",&a,&b,&c,&d); for(i=a;i<c;i++) { for(j=b;j<d;j++) { arr[i][j]=1; } } } for(i=0;i<=99;i++) { for(j=0;j<=99;j++) { num=num+arr[i][j]; } } printf("%d",num); return 0; }

#include <stdio.h> int main() { int arr[1001]={}; int i,n,j; scanf("%d",&n); for(i=0;i<n;i++) { scanf("%d",&arr[i]); } for(i=0;i<n;i++) { for(j=0;j<n;j++) { if(arr[i]>arr[j]) { printf(">") } else if(arr[i]<arr[j]) { printf("<"); } else { printf("="); } } printf("%d:%d",arr[i],) } }

/* #include <stdio.h> typedef struct { int country; int number; int score; } c; int main() { int i,n,j; c a[101],temp; scanf("%d",&n); for(i=1;i<=n;i++) { scanf("%d %d %d",&a[i].country,&a[i].number,&a[i].score); } for(i=1;i<n;i++) { for(j=1;j<=n-i;j++) { if(a[j].score<a[j+1].score) { temp=a[j]; a[j]=a[j+1]; a[j+1]=temp; } } } for(i=1;i<=2;i++) printf("%d %d\n",a[i].country,a[i].number); while(1) { if(a[1].country==a[2].country && a[2].country==a[i].country) i++; else break; } printf("%d %d\n",a[i].country,a[i].number); return 0; } */ #include <stdio.h> int a[10001]; int n,i,j,temp; int main() { n=7; for(i=1;i<=n;i++) scanf("%d",&a[i]); for(i=1;i<n;i++) { for(j=1;j<=n-i;j++) { if(a[j]<a[j+1]) { temp=a[j]; a[j]=a[j+1]; a[j+1]=temp; } } } for(i=1;i<=2;i++) printf("%d\n",a[i]); return 0; } #include <stdio.h> int a[10001]; int n,i,j,temp; int main() { n=5; for(i=1;i<=n;i++) scanf("%d",&a[i]); for(i=1;i<n;i++) { for(j=1;j<=n-i;j++) { if(a[j]<a[j+1]) { temp=a[j]; a[j]=a[j+1]; a[j+1]=temp; } } } for(i=1;i<=n;i++) printf("%d",a[3]) }