java多线程模拟实现售票功能 java多线程模拟实现售票功能

【java多线程模拟实现售票功能】铁道部发布了一个售票任务，要求销售1000张票，要求有3个窗口来进行销售，请编写多线程程序来模拟这个效果。
1 线程类
测试方法：

public static void main(String[] args) {MyThread t1 = new MyThread("窗口1"); MyThread t2 = new MyThread("窗口1"); MyThread t3 = new MyThread("窗口1"); t1.start(); t2.start(); t3.start(); }

1.1 局部加锁

public class MyThread extends Thread{ private static int ticket = 1000; private static Object obj = new Object(); public MyThread(String name) {super(name); } @Override public void run() {while(ticket > 0){synchronized(obj){if(ticket > 0){System.out.println(Thread.currentThread().getName() + "正在销售第" +(1001-ticket)+ "张票"); ticket--; }if(ticket <= 0){System.out.println(Thread.currentThread().getName() + "票已售罄"); }}} }}

1.2 方法加锁

public class MyThread extends Thread{ private static int ticket = 1000; public MyThread(String name) {super(name); } @Override public void run() {while(ticket > 0){method02(); } } //锁对象：类的字节码文件对象（MyThread.class），有static修饰 public static synchronized void method02(){if(ticket > 0){System.out.println(Thread.currentThread().getName() + "正在销售第" +(1001-ticket)+ "张票"); ticket--; }if(ticket <= 0){System.out.println(Thread.currentThread().getName() + "票已售完"); } }}

1.3 手动加锁

public class MyThread extends Thread{ private static int ticket = 1000; private static Lock lock = new ReentrantLock(); public MyThread(String name) {super(name); } @Override public void run() {while(ticket > 0){lock.lock(); //手动上锁if(ticket > 0){System.out.println(Thread.currentThread().getName() + "正在销售第" +(1001-ticket)+ "张票"); ticket--; }if(ticket <= 0){System.out.println(Thread.currentThread().getName() + "票已售完"); }lock.unlock(); //手动解锁} }}

2 任务类
测试方法：

public static void main(String[] args) {Task task = new Task(); Thread t1 = new Thread(task, "窗口1"); Thread t2 = new Thread(task, "窗口2"); Thread t3 = new Thread(task, "窗口3"); t1.start(); t2.start(); t3.start(); }

2.1 局部加锁

public class Task implements Runnable{ private int tickets=1000; @Override public void run() {while(tickets>0){synchronized (this) {if(tickets > 0){System.out.printf ("%s窗口正在售出第%d张票\n",Thread.currentThread().getName(),1001-tickets); tickets--; }if(tickets<=0){System.out.printf("%s窗口售罄\n",Thread.currentThread().getName()); }}} } }

2.2 方法加锁

public class Task implements Runnable{ private int tickets=1000; @Override public void run() {while(tickets>0){method(); } } //方法加锁，没有使用static修饰 public synchronized void method(){if(tickets > 0){System.out.printf ("%s窗口正在售出第%d张票\n",Thread.currentThread().getName(),1001-tickets); tickets--; }if(tickets<=0){System.out.printf("%s窗口售罄\n",Thread.currentThread().getName()); } }}

2.3 手动加锁

import java.util.concurrent.locks.Lock; import java.util.concurrent.locks.ReentrantLock; public class Task implements Runnable{ private int tickets=1000; private Lock lock =newReentrantLock(); @Override public void run() {while(tickets>0){ lock.lock(); //手动上锁if(tickets > 0){System.out.printf ("%s窗口正在售出第%d张票\n",Thread.currentThread().getName(),1001-tickets); tickets--; }if(tickets<=0){System.out.printf("%s窗口售罄\n",Thread.currentThread().getName()); }lock.unlock(); //手动关锁} } }

效果截图：