ThreadGroup类的isDestroyed()方法测试线程组是否已被销毁。
语法
public boolean isDestroyed()
返回
如果对象被销毁，则此方法返回true。
示例
class NewThread extends Thread
{
NewThread(String threadname, ThreadGroup tg)
{
super(tg, threadname);
}
public void run()
{
for(int i = 0;i < 10;i++)
{
i++;
}
System.out.println(Thread.currentThread().getName() + " completed executing");
}
}
public class ThreadGroupIsDestroyedExp
{
public static void main(String arg[]) throws InterruptedException,
SecurityException, Exception
{
// creating a parent threadGroup
ThreadGroup tg1 = new ThreadGroup("Parent thread");
// creating a child threadGroup
ThreadGroup tg2 = new ThreadGroup(tg1, "Child thread");
// creating a thread
NewThread t1 = new NewThread("Thread-1", tg1);
System.out.println("Starting of Thread-1");
t1.start();
// creating another thread
NewThread t2 = new NewThread("Thread-2", tg2);
System.out.println("Starting of Thread-2");
t2.start();
if (tg1.isDestroyed() == true)
System.out.println("Group is destroyed");
else
System.out.println("Group is not destroyed");
}
}
执行上面示例代码，得到以下结果：
Starting of Thread-1
Starting of Thread-2
Group is not destroyed
Thread-1 completed executing
Thread-2 completed executing
