Thread类的destroy()方法用于销毁线程组及其所有子组。 线程组必须为空，表示线程组中的所有线程都已停止。
语法
public void destroy()
异常
IllegalThreadStateException：如果线程组不为空或者线程组已被销毁，则抛出此异常。SecurityException：如果当前线程无法修改此线程组。
示例
public class JavaDestroyExp extends Thread
{
JavaDestroyExp(String threadname, ThreadGroup tg)
{
super(tg, threadname);
start();
}
public void run()
{
for (int i = 0; i < 2; i++)
{
try
{
Thread.sleep(10);
}
catch (InterruptedException ex) {
System.out.println("Exception encounterted");}
}
System.out.println(Thread.currentThread().getName() +
" finished executing");
}
public static void main(String arg[]) throws InterruptedException, SecurityException
{
// creating a ThreadGroup
ThreadGroup g1 = new ThreadGroup("Parent thread");
// creating a child ThreadGroup for parent ThreadGroup
ThreadGroup g2 = new ThreadGroup(g1, "child thread");
// creating a thread
JavaDestroyExp t1 = new JavaDestroyExp("Thread-1", g1);
// creating another thread
JavaDestroyExp t2 = new JavaDestroyExp("Thread-2", g1);
// block until other thread is finished
t1.join();
t2.join();
// destroying child thread
g2.destroy();
System.out.println(g2.getName() + " destroyed");
// destroying parent thread
g1.destroy();
System.out.println(g1.getName() + " destroyed");
}
}
执行上面示例代码，得到以下结果：
Thread-1 finished executing
Thread-2 finished executing
child thread destroyed
Parent thread destroyed
