수다닷컴

import java.awt.*;
import java.awt.event.*;
class calculator extends Frame {

private double a, b;
private TextField txa, txb;
private Button btn;
private Label lab;
private String op ;
private Choice c;

class ButtonEventListener implements ActionListener { //버튼 활성화하는 메소드
public void actionPerformed(ActionEvent ev){
a = Double.parseDouble(txa.getText());
b = Double.parseDouble(txb.getText());
op = c.getSelectedItem();

if(op == +){
lab.setText(String.valueOf(a+b));
}
else if(op == -){
lab.setText(String.valueOf(a-b));
}
else if(op == *){
lab.setText(String.valueOf(a*b));
}
else if(op == /){
lab.setText(String.valueOf(a/b));
}
else{
lab.setText(연산자가 없습니다!);
}

}
}
class WindowEventListener implements WindowListener{ //윈도우 창 닫는 메소드
public void windowClosing(WindowEvent e){
System.exit(0);
}
public void windowActivated(WindowEvent e) {}
public void windowClosed(WindowEvent e) {}
public void windowDeactivated(WindowEvent e) {}
public void windowDeiconified(WindowEvent e) {}
public void windowIconified(WindowEvent e) {}
public void windowOpened(WindowEvent e) {}
}
public calculator(String t){ //기본틀 만드는 메소드
super(t);
Panel pan = new Panel();
txa = new TextField(5);
c = new Choice();
pan.add(txa);
pan.add(c);
c.add(+);
c.add(-);
c.add(*);
c.add(/);
c.select(0);
txb = new TextField(5);
pan.add(txb);
add(pan,BorderLayout.NORTH);
btn = new Button(결과는?);
add(btn,BorderLayout.CENTER);
lab = new Label();
add(lab,BorderLayout.SOUTH);
setSize(200,120);
setVisible(true);
ButtonEventListener bel = new ButtonEventListener();
btn.addActionListener(bel);
}
}
public class D200311158_4 {
public static void main(String[] args){
new calculator(간단 계산기);
}
}

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