JAVA GUI InnerDemo.java

import javax.swing.*;
import java.awt.event.*;

public class InnerDemo extends JFrame
{
int act = 0; //用來紀錄按鈕被按的次數
public static void main(String[] args)
{
InnerDemo test = new InnerDemo();
}
//用建構方法建立元件 ，將元件加入視窗、顯示視窗
public InnerDemo()
{
setTitle("Listener2 示範");
JButton mybutton = new JButton("換個標題");
JButton mybutton1 = new JButton("換個標題2");
mybutton.addActionListener(new InnerListener());
//內部類別物件為傾聽者
getContentPane().add(mybutton);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(420,140);
setVisible(true);
}
//實做 ActionListener 介面的內部類別
class InnerListener implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
act++; //存取外部類別的act成員
setTitle("2發生"+act+"次按鈕事件");
}
}
}