鐵道部發布了一個售票任務，要求銷售1000張票，要求有3個窗口來進行銷售，請編寫多線程程序來模擬這個效果。
1 線程類
測試方法：
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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 局部加鎖
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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() + "正在銷售第" +(1001-ticket)+ "張票"); ticket--; } if(ticket <= 0){ System.out.println(Thread.currentThread().getName() + "票已售罄"); } } } }} |
1.2 方法加鎖
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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(); } } //鎖對象：類的字節碼文件對象（MyThread.class），有static修飾 public static synchronized void method02(){ if(ticket > 0){ System.out.println(Thread.currentThread().getName() + "正在銷售第" +(1001-ticket)+ "張票"); ticket--; } if(ticket <= 0){ System.out.println(Thread.currentThread().getName() + "票已售完"); } }} |
1.3 手動加鎖
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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();//手動上鎖 if(ticket > 0){ System.out.println(Thread.currentThread().getName() + "正在銷售第" +(1001-ticket)+ "張票"); ticket--; } if(ticket <= 0){ System.out.println(Thread.currentThread().getName() + "票已售完"); } lock.unlock();//手動解鎖 } }} |
2 任務類
測試方法：
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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 局部加鎖
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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張票\n",Thread.currentThread().getName(),1001-tickets); tickets--; } if(tickets<=0){ System.out.printf("%s窗口售罄\n",Thread.currentThread().getName()); } } } } } |
2.2 方法加鎖
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public class Task implements Runnable{ private int tickets=1000; @Override public void run() { while(tickets>0){ method(); } } //方法加鎖，沒有使用static修飾 public synchronized void method(){ if(tickets > 0) { System.out.printf ("%s窗口正在售出第%d張票\n",Thread.currentThread().getName(),1001-tickets); tickets--; } if(tickets<=0){ System.out.printf("%s窗口售罄\n",Thread.currentThread().getName()); } }} |
2.3 手動加鎖
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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();//手動上鎖 if(tickets > 0) { System.out.printf ("%s窗口正在售出第%d張票\n",Thread.currentThread().getName(),1001-tickets); tickets--; } if(tickets<=0){ System.out.printf("%s窗口售罄\n",Thread.currentThread().getName()); } lock.unlock();//手動關鎖 } } } |
效果截圖：
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持服務器之家。
原文鏈接：https://blog.csdn.net/DengShuo_shuai/article/details/119712285
