1、ThreadGroup,统一管理线程,比如优先级,interrupt等
public class MyThreadGroup { public static void main( String args[] ) throws Exception { ThreadGroup tg = new ThreadGroup( "My Group" ); MyThread1 thrd1 = new MyThread1( tg, "MyThread #1" ); MyThread1 thrd2 = new MyThread1( tg, "MyThread #2" ); MyThread1 thrd3 = new MyThread1( tg, "MyThread #3" ); thrd1.start(); thrd2.start(); thrd3.start(); Thread.sleep( 1000 ); System.out.println( tg.activeCount() + " threads in thread group." ); // Thread thrds[] = new Thread[tg.activeCount()]; // tg.enumerate( thrds ); // for ( Thread t : thrds ) // System.out.println( t.getName() ); thrd1.myStop(); Thread.sleep( 1000 ); System.out.println( tg.activeCount() + " threads in thread group." ); tg.interrupt(); } } class MyThread1 extends Thread { boolean stopped; MyThread1( ThreadGroup tg, String name ) { super( tg, name ); stopped = false; } public void run() { System.out.println( Thread.currentThread() + "is starting." ); try { for ( int i = 1; i < 1000; i++ ) { System.out.print( "." ); Thread.sleep( 250 ); synchronized ( this ) { if ( stopped ) break; } } } catch ( InterruptedException exc ) { System.out.println( Thread.currentThread() + ": " + exc ); } System.out.println( Thread.currentThread() + "is end." ); } synchronized void myStop() { stopped = true; } }
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