练习:使用两个不同的线程类实现买票系统
请创建两个不同的线程类、一个测试类以及一个票的管理类。
其中票的管理类用于储存票的数量。两个线程类看作不同的买票方式。
App售票线程类
public class Runnable_AppTicketSeller implements Runnable{ @Override public void run() { } }
Web售票线程类
public class Runnable_WebTicketSeller implements Runnable{ @Override public void run() { } }
买票测试类
public class BuyTicket { public static void main(String[] args) { Runnable_AppTicketSeller ra = new Runnable_AppTicketSeller(); Runnable_WebTicketSeller rb = new Runnable_WebTicketSeller(); Thread tApp = new Thread(ra,"App售票"); Thread tWeb = new Thread(rb,"Web售票"); tApp.start(); tWeb.start(); } }
票务管理类
public class TicketMgr { public static int count = 100; }
在两个run()中加入:
while (true){ if(TicketMgr.count>0){ System.out.println(Thread.currentThread().getName()+"卖出第"+TicketMgr.count+"张票"); TicketMgr.count--; }else break; }
我们需要在这添加线程锁。
但是我们现在是两个不同的线程类,按照以前的方法是不行的。
我们可以在售票处构造一个lock,然后传进两个线程类中。
那么我们要为两个线程类添加一个构造方法,传入同一个lock锁。
售票类:
public class BuyTicket { public static void main(String[] args) { Object lock = new Object(); Runnable_AppTicketSeller ra = new Runnable_AppTicketSeller(lock); Runnable_WebTicketSeller rb = new Runnable_WebTicketSeller(lock); Thread tApp = new Thread(ra,"App售票"); Thread tWeb = new Thread(rb,"Web售票"); tApp.start(); tWeb.start(); } }
两个线程类:
public class Runnable_AppTicketSeller implements Runnable{ Object lock; public Runnable_AppTicketSeller(Object lo){ lock = lo; } @Override public void run() { while (true){ synchronized (lock) { if (TicketMgr.count > 0) { System.out.println(Thread.currentThread().getName() + "卖出第" + TicketMgr.count + "张票"); TicketMgr.count--; } else break; } } } }
public class Runnable_WebTicketSeller implements Runnable{ Object lock; public Runnable_WebTicketSeller(Object lo){ lock = lo; } @Override public void run() { while (true){ synchronized (lock) { if (TicketMgr.count > 0) { System.out.println(Thread.currentThread().getName() + "卖出第" + TicketMgr.count + "张票"); TicketMgr.count--; } else break; } } } }
public class BuyTicket { public static void main(String[] args) { Object lock = new Object(); Runnable_AppTicketSeller ra = new Runnable_AppTicketSeller(lock); Runnable_WebTicketSeller rb = new Runnable_WebTicketSeller(lock); new Thread(ra,"App售票").start(); new Thread(rb,"Web售票").start(); } }
完成✅