Java Swing 只关闭当前窗体的实现

NewFrame.java
import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener; 
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
 
public class NewFrame extends JFrame {
 
 /**
 * called another JFrame
 * close this JFrame
 * write by Jimmy.li
 * time:2016/4/6 22:55
 */
 private static final long serialVersionUID = 1L;
 
 public NewFrame() {
 // 普通按钮控件
 JFrame jf = new JFrame("main");
 Toolkit tk = this.getToolkit();// 得到窗口工具条
 int width = 650;
 int height = 500;
 Dimension dm = tk.getScreenSize();
 jf.setSize(300, 200);// 设置程序的大小
 jf.setLocation((int) (dm.getWidth() - width) / 2,
 (int) (dm.getHeight() - height) / 2);// 显示在屏幕中央
 jf.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
 jf.setVisible(true);
 JPanel contentPane = new JPanel();
 jf.setContentPane(contentPane);
 
 // 创建两个按钮，并且将按钮添加到内容面板中
 
 JButton another = new JButton("另起页面"); 
 JButton close = new JButton("关闭"); 
 contentPane.add(another); 
 contentPane.add(close);
 
 another.addActionListener(new ActionListener() {
 @Override
 public void actionPerformed(ActionEvent e) {
 // TODO Auto-generated method stub
 new exit();
 }
 });
 
 close.addActionListener(new ActionListener() {
 
 @Override
 public void actionPerformed(ActionEvent e) {
 // TODO Auto-generated method stub
 System.exit(0);
 }
 });
 }
 
 public static void main(String[] args)
 
 {
 new NewFrame(); 
 }
}

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener; 
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
 
/**
 * called another JFrame close this JFrame write by Jimmy.li time:2016/4/6 22:55
 */
 
public class exit {
 
 private static final int WIDTH = 300; 
 private static final int HEIGHT = 200;
 public exit() {
 // 普通按钮控件
 final JFrame jf = new JFrame("exit");
 jf.setSize(WIDTH, HEIGHT);
 jf.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
 jf.setVisible(true);
 JPanel contentPane = new JPanel();
 jf.setContentPane(contentPane);
 
 // 创建两个按钮并添加到内容面板
 
 JButton close1 = new JButton("关闭");
 contentPane.add(close1); 
 close1.addActionListener(new ActionListener() {
 
 @Override
 public void actionPerformed(ActionEvent e) {
 // TODO Auto-generated method stub
 // System.exit(0);
 jf.dispose();
 }
 });
 }
 
 public static void main(String[] args)
 
 {
 new exit();
 } 
}

win.addWindowListener(new WindowAdapter(){
 public void windowClosing(WindowEvent e){
  System.exit(0);
  }
 });