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