lock锁（JDK1.5后添加）

lock锁（JDK1.5后添加）

1. 锁的优先使用级

   lock>代码锁>方法锁

   代码块锁synchronized的this指的是同一个demo012；

        package com.Thread;

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

        public class TrainTicket extends Thread{
            static int trainticket =10;
            public TrainTicket(String name) {
                super(name);
            }
            //lock是一个接口；必须调用他的实现类
            Lock lock = new ReentrantLock();
            public void run() {
                //把锁关上
                lock.lock();
                //有100人在抢票
                for(int i = 1;i<=100;i++){
                    if(trainticket>0){
                        System.out.println("我抢到了火车票；第"+trainticket--+"张；从"+this.getName()+"窗口");
                    }
                }
                //把锁打开
                lock.unlock();
            }
        }

        package com.Thread;
        public class Demo011 {
            public static void main(String[] args) {
                Demo012 demo012 = new Demo012();
                Thread thread = new Thread(demo012,"1号");
                thread.start();
                Thread thread2 = new Thread(demo012,"2号");
                thread2.start();
                Thread thread3 = new Thread(demo012,"3号");
                thread3.start();
            }
        }