ThreadGroup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()
返回
它不会返回任何值。
例外
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
package com.yiibai.threadgroup;
class NewThread extends Thread {
NewThread(String threadname, ThreadGroup tg) {
super(tg, threadname);
}
public void run() {
for (int i = 0; i < 10; i++) {
try {
Thread.sleep(10);
} catch (InterruptedException ex) {
System.out.println(Thread.currentThread().getName() + " interrupted");
}
}
System.out.println(Thread.currentThread().getName() + " completed executing");
}
}
public class ThreadGroupDestroyExp {
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
NewThread t1 = new NewThread("Thread-1", g1);
t1.start();
// creating another thread
NewThread t2 = new NewThread("Thread-2", g1);
t2.start();
// block until other thread is finished
t1.join();
t2.join();
// destroying child threadGroup
g2.destroy();
System.out.println(g2.getName() + " destroyed");
// destroying parent threadGroup
g1.destroy();
System.out.println(g1.getName() + " destroyed");
}
}
执行上面示例代码，得到以下结果：
Thread-2 completed executing
Thread-1 completed executing
Child thread destroyed
Parent thread destroyed
