小小的锁，大大的疑问？Lock疑问？

Posted 2021-02-28 li33

Lock锁

怎么使用？怎么把下面的这个锁弄得比较合适，大家都能去买票？？

和synchronized相比的好处？

lock的使用规范try finnally

private final ReentrantLock lock = new ReentrantLock()；//这样定义的好处？？？？？

import java.util.concurrent.locks.ReentrantLock;
public class TestLock {//这样李白会一个人拿完所有的票
    public static void main(String[] args) {
        TestLock1 testLock1 = new TestLock1();
        Thread t1 = new Thread(testLock1,"李白");
        Thread t2 = new Thread(testLock1,"杜甫");
        Thread t3 = new Thread(testLock1,"秦始皇");
        t1.start();
        t2.start();
        t3.start();
    }
}
class TestLock1 implements Runnable{
    private int ticketNum = 10;
    private final ReentrantLock lock = new ReentrantLock();
    @Override
    public void run() {
        while (true){
            try{//规范？
                lock.lock();//上锁,与ticketNum有关的代码，但是能不能再缩小范围呢？
                if(ticketNum>0){
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    System.out.println("剩余票数"+ticketNum--);
                }else{
                    break;
                }
            }finally {
                lock.unlock();//解锁
            }
        }
    }
}