lock锁

package edu.wtbu;

import java.util.concurrent.locks.ReentrantLock;

public class Demo01 {
    public static void main(String[] args) {
        Lock lock = new Lock();
        new Thread(lock).start();
        new Thread(lock).start();
        new Thread(lock).start();
    }

}
class Lock implements Runnable{
    int ticketNums=10;

    //定义lock锁
    private final ReentrantLock lock=new ReentrantLock();//ReentrantLock：可重入锁

    @Override
    public void run() {
       while (true){
         try {
             lock.lock();//加锁
             if(ticketNums>0){
                 try {
                     Thread.sleep(1000);
                 } catch (InterruptedException e) {
                     throw new RuntimeException(e);
                 }
                 System.out.println(ticketNums--);
             }else{
                 break;
             }
         }finally {
             lock.unlock();//解锁
         }
       }
    }
}