Lock锁（性能更好，是代码块锁，synchronized锁能锁方法）

package com.Java;

import java.util.concurrent.locks.ReentrantLock;

//可重入锁
public class TestLock {
    public static void main(String[] args) {
        TestLock2 testLock2 = new TestLock2();
        new Thread(testLock2).start();
        new Thread(testLock2).start();
        new Thread(testLock2).start();
    }
}

class TestLock2 extends Thread {
    int stickNum = 100;
    private ReentrantLock lock = new ReentrantLock();

    @Override
    public void run() {
        while (true) {
            lock.lock();    //锁住
            if (stickNum > 0) {
                try {
                    Thread.sleep(10);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                } finally {
                    lock.unlock();//释放锁
                }
                System.out.println(stickNum--);
            }
        }
    }
}