定时器中，定义的任务是每十秒弹出一个窗口，窗口停留3秒后自动消失

定时器中，定义的任务是每10秒弹出一个窗口，窗口停留3秒后自动消失。
代码如下：

 package kankan;                          
 import java.util.*;                      
 import javax.swing.*;                    
import java.awt.event.*;                  
import java.awt.*;                        
import javax.swing.Timer;                 
//判断是否在线                            
public class CloseWindowIn5 extends JFrame{                                                  
private JButton button=new JButton("签到")                          
public void  window(){                                                            
 this.setSize(300, 400);                  
 this.setLocation(40, 50);                
 this.setVisible(true);                   
 setLayout(null);                         
 button.setBounds(110,180,70,70);         
 add(button);                             
 button.addActionListener(new ActionListen
 public void actionPerformed(ActionEvent 
 System.out.println（“在线”);                              
 }                                       
});                                       
 }                                                                                   
public void run() {                       
try {                                     
Thread.sleep(5000);                       
 this.dispose();                          
} catch (InterruptedException e) {        
e.printStackTrace();                      
}                                                                                  
}                                                                                  

}                                         
当我点击button时，他将会在DOS窗口下打印在线。但是当我不点击时他将会打印不在线，那么这个功能怎么实现？ java 界面
[解决办法]
对楼主的代码改造完了。。应该可以完成要求了。。
另外PS下，那叫console控制台，不叫dos窗口

package com;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.WindowConstants;

public class Test extends JFrame {
private JButton button = new JButton("签到");
public boolean flag=false;


public Test() {
this.setSize(300, 400);
this.setLocation(40, 50);
this.setVisible(true);
setLayout(null);
button.setBounds(110, 180, 70, 70);
add(button);

button.addActionListener(new ActionListener() {

@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
System.out.println("在线");
flag=true;
}
});
}

public void run() {
try {
Thread.sleep(5000);
this.dispose();
} catch (InterruptedException e) {
e.printStackTrace();
}
}

public static void main(String[] args) {
new Thread(){

@Override
public void run() {
// TODO Auto-generated method stub
Test test = new Test();
while(true){
test.flag=false;
test.show(true);

try {
Thread.currentThread().sleep(3000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
test.show(false);
if(!test.flag){
System.out.println("不在线");
}
try {
Thread.currentThread().sleep(10000);
System.out.println("等待10秒");
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}

}.start();
}
}