学习ReentrantLock

1. 使用ReentrantLock

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import java.util.concurrent.locks.ReentrantLock;   public class TestReentrantLock {     public static void main(String[] args) {     final ReentrantLock reentrantLock = new ReentrantLock(true);           reentrantLock.lock();       new Thread("Thread 1") {       public void run() {         for (int i = 1; i < 5; i++) {           reentrantLock.lock();           System.out.println(Thread.currentThread().getName() + " print " + i);           reentrantLock.unlock();         }       }     }.start();       new Thread("Thread 2") {       public void run() {         for (int i = 1; i < 5; i++) {           reentrantLock.lock();           System.out.println(Thread.currentThread().getName() + " print " + i);           reentrantLock.unlock();         }       }     }.start();       System.out.println(Thread.currentThread().getName() + " Done");     reentrantLock.unlock();   } }

结果为：

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main Done Thread 1 print 1 Thread 1 print 2 Thread 1 print 3 Thread 1 print 4 Thread 2 print 1 Thread 2 print 2 Thread 2 print 3 Thread 2 print 4