GUI事件處理 ─ CalculatorEventClose

CalculatorEventClose

(範例)           修改CalculatorEvent使其視窗可以關閉


import java.awt.*; 
import java.awt.event.*;

public class CalculatorEventClose extends Frame implements ActionListener{
private static final long serialVersionUID = 1L;

TextField tf =new TextField();
String[] txt ={"7","8","9","+","4","5","6","-","1","2","3","*","0",".","=","/"}; 
Button[] btn = new Button[txt.length];

public CalculatorEventClose(){
super("Calculator");
add(tf, BorderLayout.NORTH);

addWindowListener(new WindowAdapter() {                                  // 在此加上關閉的程式
public void windowClosing(WindowEvent e){
System.exit(0);
}
});


Panel p= new Panel();
p.setLayout(new GridLayout(4,4,4,4));
for (int i=0; i<txt.length;i++){
btn [i] = new Button(txt[i]);
btn [i].addActionListener(this);
p.add(btn [i]);
}      
add(p);


setSize(200, 230);
setVisible(true);

}


public static void main(String[] args) {
new CalculatorEventClose();

}


@Override
public void actionPerformed(ActionEvent e) {
String cmd = e.getActionCommand();
tf.setText(cmd);

}


}