1 package reentrantlock;
2
3 import java.util.ArrayList;
4 import java.util.concurrent.locks.ReentrantLock;
5
6 public class TestFairSyn {
7
8 public static void main(String[] args) {
9 ArrayList<Thread> arrayList = new ArrayList<>();
10 Resrc resrc = new Resrc();
11
12 for (int i = 0; i < 15; i++){
13 arrayList.add(new Thread(resrc));
14 }
15 for (int i = 0; i < 15; i++){
16 arrayList.get(i).start();
17 }
18 }
19
20 static class Resrc implements Runnable{
21 private static boolean isTestFair = true;
22 ReentrantLock reentrantLock = new ReentrantLock(isTestFair);
23
24 @Override
25 public void run() {
26 System.out.println(Thread.currentThread().getId()+" 尝试获得锁");
27 reentrantLock.lock();
28 if (false){
29 System.out.println("\t\t" + Thread.currentThread().getId() + " 成功获得锁-解锁");
30 reentrantLock.unlock();
31 }
32 else {
33 try {
34 System.out.println("\t\t" + Thread.currentThread().getId() + " 成功获得锁");
35 // 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
36 Thread.sleep(0, 100);
37 } catch (InterruptedException e) {
38 e.printStackTrace();
39 } finally {
40 System.out.println("\t\t" + "\t\t" + Thread.currentThread().getId() + " 解锁");
41 reentrantLock.unlock();
42 }
43 }
44 }
45 }
46
47 }
