下面的程序将会产生如下图所示的界面，单击关闭按钮，窗口会被关闭，请将代码补充完整。




import java.awt.*;

import ;

public class TestWindowListener

{

private Frame f = new Frame("测试");

private ;//创建TextField类的对象ta

public void init()

{

f. (new MyListener());//注册事件监听器

f. (new BorderLayout());//设置布局

ta.setText("请单击关闭按钮！\n");

f.add(ta);

f.pack();

f.setVisible(true);

}

class MyListener WindowListener

{

public void windowActivated(WindowEvent e){}

public void windowClosed(WindowEvent e){}

public void windowClosing(WindowEvent e)

{ }//关闭窗口

public void windowDeactivated(WindowEvent e){}

public void windowDeiconified(WindowEvent e) {}

public void windowIconified(WindowEvent e){}

public void windowOpened(WindowEvent e) {}

}

public static void main(String[] args)

{new TestWindowListener().init();}

}