import java.awt.*;
public class  test extends Frame
{
public static void main(String []args)
  {
        Frame f=new Frame("我的窗口");
        f.setVisible(true);
    }
}

Frame f = new Frame("我的窗口");
        f.setVisible(true);
        f.addWindowListener(new WindowAdapter() {

            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });

------解决方案--------------------
Frame f=new Frame("我的窗口");
		f.setSize(new Dimension(100, 100));
       f.setVisible(true);
       f.addWindowListener(new WindowAdapter()
       {
           public void windowClosing(WindowEvent e)  
           {
               System.exit(0);
           }
       });

------解决方案--------------------
记得 import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

------解决方案--------------------


------解决方案--------------------
Java code

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

public class Test
{
    public static void main(String[] args)
    {
        JFrame myFrame = new JFrame("test");
        // .......do whatever you are interest in
        myFrame.setSize(800,640);
        myFrame.setVisible(true);
        myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
}