eclipse 2022-10-19

/*

import java.awt.*;

import javax.swing.*;

import java.awt.event.*;

import javax.swing.event.*;

public class Main extends JFrame {

public Main() {

setSize(400,200);

setTitle("+,- 키로 폰트 크기 조절");

Container cnt = getContentPane();

cnt.setLayout(new FlowLayout());

JLabel lbl = new JLabel("Love Java");

lbl.setFont(new Font("Arial", Font.PLAIN, 10));

addKeyListener(new KeyListener() {

@Override

public void keyTyped(KeyEvent e) { }

@Override

public void keyPressed(KeyEvent e) {

System.out.println("1");

Font fnt = lbl.getFont();

int size = fnt.getSize();

if(e.getKeyCode() == KeyEvent.VK_EQUALS) {

lbl.setFont(new Font("Arial", Font.PLAIN, size + 5));

}

if(e.getKeyCode() == KeyEvent.VK_MINUS) {

lbl.setFont(new Font("Arial", Font.PLAIN, size - 5));

}

}

@Override

public void keyReleased(KeyEvent e) { }

});

cnt.add(lbl);

setVisible(true);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

public static void main(String[] args) {

new Main();

}

}

*/

/*

import java.awt.*;

import javax.swing.*;

import java.awt.event.*;

import javax.swing.event.*;

public class Main extends JFrame {

public Main() {

setTitle("클릭 연습 용 응용프로그램");

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

setSize(350,350);

Container cnt = getContentPane();

cnt.setLayout(null);

cnt.setSize(350,350);

JLabel lbl = new JLabel("C");

lbl.setSize(20,20);

lbl.setLocation(100,100);

cnt.add(lbl);

addMouseListener(new MouseListener() {

@Override

public void mouseClicked(MouseEvent e) {

System.out.println(e.getPoint() + " " + lbl.getLocation());

if(e.getX() - 20 <= lbl.getX() && e.getY() - 40 <= lbl.getY()

&& e.getX() + 20 >= lbl.getX() && e.getY() + 40 >= lbl.getY()) {

System.out.println("1");

lbl.setLocation((int)(Math.random()*200)+100,(int)(Math.random()*200)+100);

setVisible(true);

}

}

@Override

public void mousePressed(MouseEvent e) { }

@Override

public void mouseReleased(MouseEvent e) { }

@Override

public void mouseEntered(MouseEvent e) { }

@Override

public void mouseExited(MouseEvent e) { }

});

setVisible(true);

}

public static void main(String[] args) {

new Main();

}

}

*/

/*

import java.awt.*;

import javax.swing.*;

import java.awt.event.*;

import javax.swing.event.*;

public class Main extends JFrame {

public Main() {

setTitle("마우스 휠을 굴려 폰트 크기 조...");

setSize(400,200);

Container cnt = getContentPane();

cnt.setLayout(new FlowLayout());

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

JLabel lbl = new JLabel("Love Java");

lbl.setFont(new Font("Arial", Font.PLAIN, 10));

addMouseWheelListener(new MouseWheelListener() {

@Override

public void mouseWheelMoved(MouseWheelEvent e) {

Font f = lbl.getFont();

int size = f.getSize();

int n = e.getWheelRotation();

if(n < 0) {

lbl.setFont(new Font("Arial", Font.PLAIN, size + 5));

}

if(n > 0) {

lbl.setFont(new Font("Arial", Font.PLAIN, size - 5));

}

setVisible(true);

}

});

cnt.add(lbl);

setVisible(true);

}

public static void main(String[] args) {

new Main();

}

}

*/

import java.awt.*;

import javax.swing.*;

import java.awt.event.*;

import javax.swing.event.*;

class Main extends JFrame {

String text[] = {"0", "1", "2", "3",

"4", "5", "6", "7",

"8", "9", "CE", "계산",

"+", "-", "x", "/"};

public Main() {

setTitle("계산기 프레임");

setSize(300,250);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

Container cnt = getContentPane();

cnt.setLayout(new BorderLayout());

String mathex1 = " ";

JPanel pnl1 = new JPanel();

pnl1.setBackground(Color.gray);

pnl1.setLayout(new FlowLayout());

pnl1.add(new JLabel("수식"));

JTextArea mathex = new JTextArea(1,8);

pnl1.add(mathex);

pnl1.add(new JLabel(" 결과"));

JTextArea result = new JTextArea(1,6);

pnl1.add(result);

JPanel pnl2 = new JPanel();

pnl2.setBackground(Color.white);

pnl2.setLayout(new GridLayout(4,4,5,5));

for(int i = 0; i < 16; i++) {

JButton btn = new JButton(text[i]);

if(i < 10) {

btn.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

JButton b = (JButton)e.getSource();

String x = mathex.getText() + btn.getText();

mathex.setText(x);

mathex1.concat(btn.getText());

}

});

}

if(i == 10) {

btn.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

JButton b = (JButton)e.getSource();

String x = null;

mathex.setText(x);

}

});

}

if(i == 11) {

btn.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

JButton b = (JButton)e.getSource();

int x, rear = 0;

System.out.println("1");

System.out.println(mathex1);

}

});

}

if(i > 11) {

btn.setBackground(Color.cyan);

btn.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

JButton b = (JButton)e.getSource();

String x = mathex.getText() + btn.getText();

mathex.setText(x);

mathex1.concat(" " + btn.getText()+" ");

}

});

}

pnl2.add(btn);

}

JPanel pnl3 = new JPanel();

pnl3.setBackground(Color.yellow);

pnl3.setLayout(new FlowLayout(FlowLayout.LEFT,0,0));

pnl3.add(new JLabel(" 계산 결과"));

pnl3.add(new JTextField(" "));

cnt.add(pnl1, BorderLayout.NORTH);

cnt.add(pnl2, BorderLayout.CENTER);

cnt.add(pnl3, BorderLayout.SOUTH);

setVisible(true);

}

public static void main(String[] args) {

new Main();

}

}