sample20_3.java

Java SE 6.0前19-25章示的示例代码,简单易学

package wyf.jc;
import java.awt.event.*;
import javax.swing.*;
//定义该类继承自JFrame
public class Sample20_3 extends JFrame implements WindowListener
{
	//定义构造器
	public Sample20_3()
	{
		//设置窗体的标题
		this.setTitle("关闭窗体事件处理被重新定义的窗体");
		//向窗体中添加一个标签
		this.add(new JLabel("                          这是一个演示窗体，"
		       +"用来演示如何监听窗体关闭事件！！！"));		
		//注册WindowListener监听器
		this.addWindowListener(this);
		//设置窗体的大小
		this.setBounds(100,100,500,200);
		//设置窗体的可见性
		this.setVisible(true);
	}
	//实现WindowListener接口中的各个方法
	public void windowClosing(WindowEvent e)
	{		
		System.out.println("当窗体关闭时将执行这里的代码！！！");
		System.exit(0);
	}
	public void windowOpened(WindowEvent e){}
	public void windowClosed(WindowEvent e){}
	public void windowIconified(WindowEvent e){}
	public void windowDeiconified(WindowEvent e){}
	public void windowActivated(WindowEvent e){}
	public void windowDeactivated(WindowEvent e){}
	public static void main(String[] args)
	{
		//创建Sample20_3窗体对象
		new Sample20_3();		
	}
}