2025 02 23

//import java.awt.*;

//import java.awt.event.*;

//import javax.swing.*;

//

//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() {

// setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

// Container c = getContentPane();

// c.setLayout(null);

// c.add(la1);

// la1.setSize(60,60);

// la1.setLocation(40,20);

// c.add(la2);

// la2.setSize(60,60);

// la2.setLocation(60,20);

// c.add(la3);

// la3.setSize(60,60);

// la3.setLocation(80,20);

// c.add(la4);

// la4.setSize(80,80);

// la4.setLocation(40,40);

// c.addKeyListener(new MyKeyListener());

// c.setFocusable(true);

// c.requestFocus();

// setSize(250, 250);

// setVisible(true);

// }

//

// class MyKeyListener extends KeyAdapter {

// public void keyPressed(KeyEvent e) {

// if(e.getKeyChar() == '\n'); {

// int x = (int)(Math.random()*2);

// la1.setText(Integer.toString(x));

// int y = (int)(Math.random()*2);

// la2.setText(Integer.toString(y));

// int z = (int)(Math.random()*2);

// 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();

// }

//}

import java.awt.*;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.*;

class Main extends JFrame{

JTextField tf1 = new JTextField(13);

JTextField tf2 = new JTextField(11);

public Main() {

setTitle("계산기 프레임");

Container c = getContentPane();

c.setLayout(new BorderLayout());

JPanel p1 = new JPanel();

JPanel p2 = new JPanel();

JPanel p3 = new JPanel();

c.add(p1, BorderLayout.NORTH);

c.add(p2, BorderLayout.CENTER);

c.add(p3, BorderLayout.SOUTH);

p1.setBackground(Color.GRAY);

p1.setLayout(new FlowLayout());

p2.setBackground(Color.WHITE);

p2.setLayout(new GridLayout(4,4,1,1));

p3.setBackground(Color.YELLOW);

p3.setLayout(new FlowLayout());

p1.add(new JLabel("수식입력"));

p1.add(tf1);

p3.add(new JLabel("계산 결과"));

p3.add(tf2);

String[] arr = {"CE","계산","+","-","x","/"};

for(int i=0;i<=9;i++) {

JButton b = new JButton(Integer.toString(i));

b.addActionListener(new MyActionListener());

p2.add(b);

}

for(int i=0;i<=5;i++){

JButton b = new JButton(arr[i]);

b.addActionListener(new MyActionListener());

p2.add(b);

if(i>=2) {

b.setBackground(Color.CYAN);

}

}

setSize(400,300);

setVisible(true);

}

class MyActionListener implements ActionListener {

public void actionPerformed(ActionEvent e) {

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

String a = b.getText();

if(a.equals("CE")) { //tf1 글자없애기

tf1.setText("");

}

else if(a.equals("계산")) { //계산결과 tf2에 settext하기

//1. 한자리숫자 연산자 한자리숫자

String sik = tf1.getText();

int aa = sik.charAt(0)-48;

char x = sik.charAt(1);

int bb = sik.charAt(2)-48;

int res;

if(x=='+') {

res = aa+bb;

}

else if(x=='-') {

res = aa-bb;

}

else if(x=='/') {

res = aa/bb;

}

else {

res = aa*bb;

}

tf2.setText(Integer.toString(res));

}

else {

tf1.setText(tf1.getText()+a);

}

}

}

public static void main(String[] args) {

new Main();

}

}