公平锁：

1 import java.util.concurrent.locks.ReentrantLock; 2  3 public class Service { 4      5     private ReentrantLock lock; 6      7     public Service(boolean isFair) { 8         lock = new ReentrantLock(); 9     }10 11     public void serviceMethod() {12         try {13             lock.lock();14             System.out.println(Thread.currentThread().getName() + "获取的锁");15         } finally {16             lock.unlock();17         }18     }19 }

1 public class Run { 2  3     /** 4      *    公平锁 5      */ 6     public static void main(String[] args) { 7         final Service service = new Service(true); 8          9         Runnable runnable = new Runnable() {10             @Override11             public void run() {12                 System.out.println("线程：" + Thread.currentThread().getName());13                 service.serviceMethod();14             }15         };16         17         Thread[] threads = new Thread[10];18         for (int i = 0; i < 10; i++) {19             threads[i] = new Thread(runnable);20         }21         for (int i = 0; i < 10; i++) {22             threads[i].start();23         }24     }25 }

运行结果如下：