好囧，本来想让窗体标题显示窗体运行时间的，后来被我弄出死循环了

各位，别大意啊package Test2;
import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;import javax.swing.*;class Jie2 extends JFrame
{
JPanel contentPane;
long startTime;
public Jie2()
{
contentPane = new JPanel();
this.setContentPane(contentPane);

this.setBounds(30,30,200,200);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

this.addWindowListener(new WindowAdapter(){
@Override
public void windowOpened(WindowEvent e)
{
startTime = System.currentTimeMillis();
do_this_showInfo();
}
});
}
public void do_this_showInfo()
{
while(true)
{
long nowTime = System.currentTimeMillis();
this.setTitle("窗体运行了 "+(nowTime-startTime)/1000+" s");
}
}
}
public class Demo2 
{ /**
 * @param args
 */
public static void main(String[] args)
{
// TODO Auto-generated method stub
try {
// TODO Auto-generated method stub
UIManager
.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
EventQueue.invokeLater(new Runnable()
{
@Override
public void run()
{
Jie2 jie2 = new Jie2();
jie2.setVisible(true);
}        });
}
}呵呵，笑死我了！