java 5 Lock

 import java.util.concurrent.locks.Lock;
 import java.util.concurrent.locks.ReentrantLock;

 public class LookTest
 {
     public static void main(String[] args)
     {
         runThread("hello");
         runThread("world");
     }

     private static void runThread(final String str)
     {
         new Thread(new Runnable()
         {
             public void run()
             {
 //                outPut(str);
                 outPut2(str);
             }
         }).start();
     }

     private static void outPut(String str)
     {
         // 使用synchronized对代码加锁
         synchronized (LookTest.class)
         {
             for(int i = 0; i < str.length(); i++)
             {
                 System.out.print(str.charAt(i));
             }
             System.out.println();
         }
     }

     private static Lock lock = new ReentrantLock();
     private static void outPut2(String str)
     {
         // 使用lock锁
         lock.lock();
         for(int i = 0; i < str.length(); i++)
         {
             System.out.print(str.charAt(i));
         }
         System.out.println();
         lock.unlock();
     }
 }

输出结果：

world
hello