1 class Service{
 2     public void fun1(){
 3         synchronized(this){
 4             try{
 5                 Thread.sleep(3000); //休眠3秒; 可能会异常
 6             }
 7             catch(Exception e){
 8                 System.out.println(e);
 9             }
               System.out.println("fun1");
10         }
11     }
12     public void fun2(){
13         synchronized(this){
14             System.out.println("fun2");
15         }
16     }
17 }

 1 class MyThread1 implements Runnable{{
 2     private Service service;
 3     
 4     public MyThread1(Service service){
 5         this.service = service;
 6     }
 7     
 8     public void run(){
 9         service.fun1();
10     }
11 }

 1 class MyThread2 implements Runnable{{
 2     private Service service;
 3     
 4     public MyThread2(Service service){
 5         this.service = service;
 6     }
 7     
 8     public void run(){
 9         service.fun2();
10     }
11 }

 1 class Test{
 2     public static void main(String args []){
 3         Service service = new Service();
           //共用service对象
 4         Thread t1 = new Thread(new MyThread1(service));
 5         Thread t2 = new Thread(new MyThread2(service));
 6         
 7         t1.start();
 8         t2.start();
 9     }
10 }