java多线程交替打印奇偶数怎么实现

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猴君
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在Java中,可以使用synchronized关键字和wait()notify()方法来实现多线程交替打印奇偶数。下面是一个简单的示例:

public class AlternatePrinting {      private static final Object lock = new Object();     private static int count = 1;      public static void main(String[] args) {         Thread oddThread = new Thread(new OddNumberPrinter(), "OddThread");         Thread evenThread = new Thread(new EvenNumberPrinter(), "EvenThread");          oddThread.start();         evenThread.start();     }      static class OddNumberPrinter implements Runnable {         @Override         public void run() {             while (count <= 100) {                 synchronized (lock) {                     if (count % 2 == 1) {                         System.out.println(Thread.currentThread().getName() + ": " + count++);                         lock.notify();                     } else {                         try {                             lock.wait();                         } catch (InterruptedException e) {                             e.printStackTrace();                         }                     }                 }             }         }     }      static class EvenNumberPrinter implements Runnable {         @Override         public void run() {             while (count <= 100) {                 synchronized (lock) {                     if (count % 2 == 0) {                         System.out.println(Thread.currentThread().getName() + ": " + count++);                         lock.notify();                     } else {                         try {                             lock.wait();                         } catch (InterruptedException e) {                             e.printStackTrace();                         }                     }                 }             }         }     } } 

在这个示例中,我们创建了两个线程:oddThreadevenThreadoddThread负责打印奇数,evenThread负责打印偶数。它们共享一个锁对象lock和一个静态变量count

count为奇数时,oddThread获取锁并打印数字,然后增加count并调用lock.notify()唤醒等待的线程。接着,oddThread调用lock.wait()释放锁并进入等待状态。

count为偶数时,evenThread的行为与oddThread类似。

这样,两个线程就可以交替打印奇偶数了。

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