学习ReentrantLock

1. 使用ReentrantLock

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：

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