多线程模拟售票

需求:某电影院出售某些电影的票(复联3,红高粱....),有三个窗口同时进行售票(100张票),请您设计一个程序,模拟电影院售票
两种方式:
继承
接口
（1）synchronized实现
public class SellTicketDemo {

public static void main(String[] args) {//创建资源类对象(共享资源类/目标对象)    SellTicket st = new SellTicket() ;    //创建线程类对象    Thread t1 = new Thread(st, "窗口1") ;    Thread t2 = new Thread(st ,"窗口2") ;    Thread t3 = new Thread(st, "窗口3") ;    //启动线程    st1.start();    st2.start();    st3.start();}

}
public class SellTicket implements Runnable {

//定义100张票private int tickets = 100 ;private Object obj = new Object() ;@Overridepublic void run() {    while(true) {        //new Object():锁对象 (门和关)        //t1,t2,t3        synchronized(obj) {//t1进来,门一关,t2,t3进不来了            if(tickets>0) {                try {                    //睡眠:延迟                    Thread.sleep(100);                 } catch (InterruptedException e) {                    e.printStackTrace();                }                System.out.println(Thread.currentThread().getName()                        +"正在出售第"+(tickets--)+"张票");//0,-1            }        }    }}

}
（2）Lock实现
//测试类
public class SellTicketDemo {

public static void main(String[] args) {    SellTicket st = new SellTicket() ;    Thread t1 = new Thread(st,"窗口1") ;    Thread t2 = new Thread(st,"窗口2") ;    Thread t3 = new Thread(st,"窗口3") ;    //启动线程    t1.start();     t2.start();     t3.start();}

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

public class SellTicket implements Runnable {

// 定义票private int tickets = 100;// Object obj = new Object();// Jdk5.0以后,java提供了一个具体的锁: 接口:Lockprivate Lock lock= new ReentrantLock(); //显示获取锁的前提,一定要创建Lock接口对象@Overridepublic void run() {    while (true) {        try { //try...finally            lock.lock(); // 获取锁    syncrhonized(obj)            if (tickets > 0) {                try {                    Thread.sleep(100);                } catch (InterruptedException e) {                    e.printStackTrace();                }                System.out.println(Thread.currentThread().getName() + "正在出售第" + (tickets--) + "张票");            }        } finally {//释放锁            if(lock!=null) {                lock.unlock();            }        }    }}

}