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：
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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
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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
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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
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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：
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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
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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
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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
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import java.util.concurrent.locks.Lock;import java.util.concurrent.locks.ReentrantLock;public class Task implements Runnable{ private int tickets=1000; private Lock lock =new ReentrantLock(); @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：
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/DengShuo_shuai/article/details/119712285
