java ReentrantLock 公平锁 非公平锁 测试

 package reentrantlock;

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

 public class TestFairSyn {

     public static void main(String[] args) {
         ArrayList<Thread> arrayList = new ArrayList<>();
         Resrc resrc = new Resrc();

         for (int i = 0; i < 15; i++){
             arrayList.add(new Thread(resrc));
         }
         for (int i = 0; i < 15; i++){
             arrayList.get(i).start();
         }
     }

     static class Resrc implements Runnable{
         private static boolean isTestFair = true;
         ReentrantLock reentrantLock = new ReentrantLock(isTestFair);

         @Override
         public void run() {
             System.out.println(Thread.currentThread().getId()+" 尝试获得锁");
             reentrantLock.lock();
             if (false){
                 System.out.println("\t\t" + Thread.currentThread().getId() + " 成功获得锁-解锁");
                 reentrantLock.unlock();
             }
             else {
                 try {
                     System.out.println("\t\t" + Thread.currentThread().getId() + " 成功获得锁");
                     // 如果测试 公平锁，把睡眠时间取消，能够大大增加线程的抢占现象
                     Thread.sleep(0, 100);
                 } catch (InterruptedException e) {
                     e.printStackTrace();
                 } finally {
                     System.out.println("\t\t" + "\t\t" + Thread.currentThread().getId() + " 解锁");
                     reentrantLock.unlock();
                 }
             }
         }
     }

 }