用Java编写一个应用程序，要求包含一个窗口，并且要求利用窗口事件相应，实现窗口的关闭

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

public class L {
public static void main(String[] args) {
new H();
}
}

class H extends Frame {
Button b;

H() {
setLayout(new FlowLayout());
b = new Button("关闭");
add(b);
P police = new P();
b.addActionListener(police);// 内部类的实例做监视器

setBounds(100, 100, 150, 150);
setVisible(true);
validate();
}

class P implements ActionListener {// 内部类
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
}
}

import java.awt.Frame;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

class MyFrame extends Frame
{
public MyFrame()
{

setSize(200, 200);

addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent event)
{
System.exit(0);
}
});
setVisible(true);
}
}

public class test
{
public static void main(String args[])
{
new MyFrame();
}
}