Java Java.lang.ThreadGroup.interrupt()用法及代码示例

描述

这个java.lang.ThreadGroup.interrupt()方法中断此线程组中的所有线程。

声明

以下是声明java.lang.ThreadGroup.interrupt()方法

public final void interrupt()

参数

NA

返回值

此方法不返回任何值。

异常

SecurityException- 如果当前线程不被允许访问该线程组或线程组中的任何线程。

示例

下面的例子展示了 java.lang.ThreadGroup.interrupt() 方法的用法。

package com.tutorialspoint;

import java.lang.*;

class newThread extends Thread {
   boolean stop;

   newThread(ThreadGroup group, String name) {
      super(group, name);
      stop = false;
   }

   public void run() {
      System.out.println(Thread.currentThread().getName() + " starting.");
      try {
         for(int i = 1; i < 1000; i++) {
            Thread.sleep(500);
            synchronized(this) {
               if(stop)
                  break;
            }   
         }
      } catch(Exception e) {
         System.out.print(Thread.currentThread().getName());
         System.out.println(" interrupted.");
      }
      System.out.println(Thread.currentThread().getName() + " exiting.");
   }

   synchronized void stopFunc() {
      stop = true;
   }
}

public class ThreadGroupDemo {

   public static void main(String args[]) throws Exception {

      ThreadGroup group = new ThreadGroup("new Group");

      newThread t1 = new newThread(group, "Thread1");
      newThread t2 = new newThread(group, "Thread2");
   
      // this will call run() method
      t1.start();
      t2.start();
   
      Thread.sleep(1000);

      // it shows current active threads in Thread Group
      System.out.println(group.activeCount() + " threads in thread group...");

      // returns the number of thread groups
      Thread th[] = new Thread[group.activeCount()];
      group.enumerate(th);
      for(Thread t:th)
         System.out.println(t.getName());

      t1.stopFunc();
      Thread.sleep(1000);
    
      System.out.println(group.activeCount() + " threads in thread group...");
      // thread group interrupted
      group.interrupt();
   }
}

让我们编译并运行上面的程序，这将产生以下结果 -

Thread1 starting.
Thread2 starting.
2 threads in thread group...
Thread1
Thread2
Thread1 exiting.
1 threads in thread group...
Thread2 interrupted.
Thread2 exiting.