Java如何检查一个线程停止或没有？

解决方法

下面的示例演示如何使用 isAlive()方法检查一个线程是否停止。

public class Main {

   public static void main(String[] argv)

   throws Exception {

      Thread thread = new MyThread();

      thread.start();

      if (thread.isAlive()) {

         System.out.println("Thread has not finished");

      }

      else {

         System.out.println("Finished");

      }

      long delayMillis = 5000;

      thread.join(delayMillis);

      if (thread.isAlive()) {

         System.out.println("thread has not finished");

      }

      else {

         System.out.println("Finished");

      }

      thread.join();

   }

}

class MyThread extends Thread {

   boolean stop = false;

   public void run() {

      while (true) {

         if (stop) {

            return;

         }

      }

   }

}

结果

上面的代码示例将产生以下结果。

Thread has not finished

Finished