java多線程模擬實現售票功能

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鐵道部發佈瞭一個售票任務，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：

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

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

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

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：

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

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

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

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：

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