Java多线程之---ThreadGroup 管理Thread

来源：互联网发布：office 2011 mac 编辑：程序博客网时间：2024/05/18 03:40

转自：http://blog.csdn.net/a352193394/article/details/39323427

当创建了好几个线程的时候，很多线程的工作任务是类似或者一致的，这样我们就可以使用ThreadGroup来管理他

们，ThreadGroup可以随时的获取在他里面的线程的运行状态，信息，或者一条命令关闭掉这个group里面的所有线

程，非常的简单实用，下面我们用一个例子来说明一下如何使用。

import java.util.Date;  import java.util.Random;  import java.util.concurrent.TimeUnit;    public class SearchTask implements Runnable {        public SearchTask(Result result) {          this.result = result;      }        private Result result;        @Override      public void run() {          String name = Thread.currentThread().getName();          System.out.println("Thread Start " + name);          try {              doTask();              result.setName(name);          } catch (InterruptedException e) {              System.out.printf("Thread %s: Interrupted\n", name);              return;          }          System.out.println("Thread end " + name);      }        private void doTask() throws InterruptedException {          Random random = new Random((new Date()).getTime());          int value = (int) (random.nextDouble() * 100);          System.out.printf("Thread %s: %d\n", Thread.currentThread().getName(),                  value);          TimeUnit.SECONDS.sleep(value);      }        public static void main(String[] args) {          //创建5个线程，并入group里面进行管理          ThreadGroup threadGroup = new ThreadGroup("Searcher");          Result result = new Result();          SearchTask searchTask = new SearchTask(result);          for (int i = 0; i < 5; i++) {              Thread thred = new Thread(threadGroup, searchTask);              thred.start();              try {                  TimeUnit.SECONDS.sleep(1);              } catch (InterruptedException e) {                  e.printStackTrace();              }          }          //通过这种方法可以看group里面的所有信息          System.out.printf("Number of Threads: %d\n", threadGroup.activeCount());          System.out.printf("Information about the Thread Group\n");          threadGroup.list();            //这样可以复制group里面的thread信息          Thread[] threads = new Thread[threadGroup.activeCount()];          threadGroup.enumerate(threads);          for (int i = 0; i < threadGroup.activeCount(); i++) {              System.out.printf("Thread %s: %s\n", threads[i].getName(),                      threads[i].getState());          }                    waitFinish(threadGroup);          //将group里面的所有线程都给interpet          threadGroup.interrupt();      }        private static void waitFinish(ThreadGroup threadGroup) {          while (threadGroup.activeCount() > 9) {              try {                  TimeUnit.SECONDS.sleep(1);              } catch (InterruptedException e) {                  e.printStackTrace();              }          }      }    }

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