javaGUI实现简单的window关闭功能,该如何解决_J2SE

javaGUI实现简单的window关闭功能

Java code

import java.awt.*;import java.awt.event.*;public class TestWindowClose {    public static void main (String[] args) {    }}class MyFrame extends Frame{    MyFrame(String s){        super(s);        setLayout(null);        setBounds(300,300,400,300);        this.setBackground(new Color(204,204,255));        setVisible(true);            this.addWindowListener(            new WindowAdapter(){                public void windowClosing(WindowEvent e){                    setVisible(false);                    System.exit(-1);                }            }                );    }}

为什么运行没有界面,好像窗口直接就关闭了

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main方法为空...
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MyFrame构造函数里面写
setDefaultCloseOperation(this.EXIT_ON_CLOSE);
就可以在窗口关闭的时候关掉进程了吧
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探讨
main方法为空...

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Java code

import java.awt.*;import java.awt.event.*;public class TestWindowClose {    public static void main (String[] args) {        String s = null;        MyFrame myFrame=new MyFrame(s);    }}class MyFrame extends Frame{    MyFrame(String s){        super(s);        setLayout(null);        setBounds(300,300,400,300);        this.setBackground(new Color(204,204,255));        setVisible(true);            this.addWindowListener(            new WindowAdapter(){                public void windowClosing(WindowEvent e){                    setVisible(false);                    System.exit(-1);                }            }                );    }}