Lock l = ...;
     l.lock();
     try {
         // access the resource protected by this lock
     } finally {
         l.unlock();
     }

 1 public class Test {
 2 
 3     public static void main(String[] args) {
 4         new Test().init();
 5     }
 6     
 7     private void init(){
 8         Outputer outputer = new Outputer();
 9         //新建第一个线程
10         new Thread(new Runnable(){
11             public void run() {
12                 while(true){
13                     try {
14                         Thread.sleep(10);
15                     } catch (InterruptedException e) {
16                         e.printStackTrace();
17                     }
18                     outputer.output("shen_smile");
19                 }
20             }
21         }).start();
22         //新建第二个线程
23         new Thread(new Runnable(){
24             public void run() {
25                 while(true){
26                     try {
27                         Thread.sleep(10);
28                     } catch (InterruptedException e) {
29                         e.printStackTrace();
30                     }
31                     outputer.output("LockTest");
32                 }
33             }
34         }).start();
35     }
36     //静态内部类
37     static class Outputer{
38         Lock lock = new ReentrantLock();//新建一个锁对象
39         public void output(String name){
40             int len = name.length();
41             lock.lock();
42             try{
43                 for(int i=0;i<len;i++){
44                     System.out.print(name.charAt(i));
45                 }
46                 System.out.println();
47             }finally{
48                 lock.unlock();
49             }
50         }
51         //用synchronized实现代码段的互斥调用
52         public synchronized void output2(String name){
53             int len = name.length();
54             for(int i=0;i<len;i++){
55                 System.out.print(name.charAt(i));
56             }
57             System.out.println();
58         }
59     }
60 }