20231025

import javax.swing.*;

import java.awt.*;

class Main extends JFrame{

public Main(){

Container c = getContentPane();

setTitle("Let's study Java");

setSize(400,200);

setVisible(true);

}

public static void main(String[] args) {

new Main();

}

}*/

/*

import javax.swing.*;import javax.swing.border.Border;

import java.awt.*;

class Main extends JFrame{

public Main(){

Container c=getContentPane();

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

c.setLayout(new BorderLayout(5, 7));

c.add (new JButton("Center"), BorderLayout.CENTER);

c.add(new JButton("EAST"), BorderLayout.EAST);

c.add(new JButton("WEST"), BorderLayout.WEST);

c.add(new JButton("NORTH"), BorderLayout.NORTH);

c.add(new JButton("SOUTH"), BorderLayout.SOUTH);

setSize(456, 789);

setVisible(true);

}

public static void main(String[] args) {

new Main();

}

}

Integer.parseInt( 문자열)

cyan : 하늘색

magenta : 자주색

darkgray

lightgray

*

*

*

Math.random() : 0이상 ~ 1미만의 랜덤 실수 리턴

Math.random()*20 : 0이상 20미만의 랜덤 실수 리턴

(int)(Math.random()*20) : 0이상 20미만의 랜덤 "정수"리턴

*/

/*

import javax.swing.*;

import java.awt.*;

class Main extends JFrame{

public Main() {

Container c=getContentPane();

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

//c.setLayout(new GridLayout(1,10));

c.setLayout(null); //배치관리자를 없애버려 -> 내가 원하는 크기, 위치에 놓을 수 있음!

Color[] carray = {Color.red, Color.orange, Color.yellow, Color.green, Color.cyan,

Color.blue,Color.magenta, Color.DARK_GRAY, Color.pink, Color.LIGHT_GRAY};

for(int i=0;i<10;i++) {

String stri = Integer.toString(i); //정수->문자열

JButton b = new JButton(stri);

b.setSize(50, 50);

int x = (int)(Math.random()*800);

int y = (int) (Math.random()*800);

b.setLocation(x,y);

b.setBackground(carray[i]);

c.add(b);

}

setSize(800,800);

setVisible(true);

}

public static void main(String[] args) {

new Main();

}

}

import javax.swing.*;

import java.awt.*;

class Main extends JFrame{

public Main() {

Container c =getContentPane();

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

c.setLayout(null);

for (int i=0;i<20;i++) {

String stri = Integer.toString(i);

JButton label=new JButton(stri);

label.setSize(10,10);

int x=(int)(Math.random()*500+25);

int y=(int)(Math.random()*500+25);

label.setLocation(x, y);

label.setSize(25, 25);

label.setOpaque(true);

label.setBackground(Color.blue);

c.add(label);

}

setSize(500,500);

setVisible(true);

}

public static void main(String[] args) {

new Main();

}

}

*/

/*

import javax.swing.*;

import java.awt.*;

class Main extends JFrame{

public Main() {

Container c =getContentPane();

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

c.setLayout(null);

int z=(int)(Math.random()*100);

for (int i=0;i<z;i++) {

String stri = Integer.toString(i);

JButton label=new JButton(stri);

label.setSize(10,10);

int x=(int)(Math.random()*500+25);

int y=(int)(Math.random()*500+25);

label.setLocation(x, y);

label.setSize(25, 25);

label.setOpaque(true);

label.setBackground(Color.blue);

c.add(label);

}

setSize(500,500);

setVisible(true);

}

public static void main(String[] args) {

new Main();

}

}*/

import javax.swing.*;

import java.awt.*;

class Main extends JFrame{

public Main() {

Container c=getContentPane();

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

}