如图所示。
程序如下:
//Java_2.java
import java.awt.*;
import java.awt.event.*;
public class Java_2 extends Frame
public Java_2 (String s)
super(s);
public static void main(String args \ [\] )
Java_2 fr=new Java_2 ("Testing");
Button b=new Button ("Please press me !");
b.addActionListener (______);
fr.add(b);
fr.setSize (200, 200 );
fr.addWindowListener(new WindowAdapter()
public void windowClosing(WindowEvent e)
System.exit (0);
);
fr.setVisible (______);
class HandleButton implements ActionListener
public void actionPerformed(ActionEvent e)
System.out.println ("The buUon is pressed!");
