void destroy()
描述 (Description)
java.lang.ThreadGroup.destroy()方法会销毁此线程组及其所有子组。 此线程组必须为空，表示此线程组中的所有线程都已停止。
声明 (Declaration)
以下是java.lang.ThreadGroup.destroy()方法的声明
public final void destroy()
参数 (Parameters)
NA
返回值 (Return Value)
此方法不返回任何值。
异常 (Exception)
IllegalThreadStateException - 如果线程组不为空或者线程组已被销毁。
SecurityException - 如果当前线程无法修改此线程组。
例子 (Example)
以下示例显示了java.lang.ThreadGroup.destroy（）方法的用法。
package com.iowiki;
import java.lang.*;
public class ThreadGroupDemo implements Runnable {
public static void main(String[] args) {
ThreadGroupDemo tg = new ThreadGroupDemo();
tg.func();
}
public void func() {
try {
// create a parent ThreadGroup
ThreadGroup pGroup = new ThreadGroup("Parent ThreadGroup");
// create a child ThreadGroup for parent ThreadGroup
ThreadGroup cGroup = new ThreadGroup(pGroup, "Child ThreadGroup");
// create a thread
Thread t1 = new Thread(pGroup, this);
System.out.println("Starting " + t1.getName() + "...");
t1.start();
// create another thread
Thread t2 = new Thread(cGroup, this);
System.out.println("Starting " + t2.getName() + "...");
t2.start();
// block until the other threads finish
t1.join();
t2.join();
// child group destroyed
cGroup.destroy();
System.out.println(cGroup.getName() + " destroyed");
// parent group destroyed
pGroup.destroy();
System.out.println(pGroup.getName() + " destroyed");
} catch (InterruptedException ex) {
System.out.println(ex.toString());
}
}
// implements run()
public void run() {
for(int i = 0;i<1000;i++) {
i++;
}
System.out.println(Thread.currentThread().getName() + " finished executing.");
}
}
让我们编译并运行上面的程序，这将产生以下结果 -
Starting Thread-0...
Starting Thread-1...
Thread-0 finished executing.
Thread-1 finished executing.
Child ThreadGroup destroyed
Parent ThreadGroup destroyed
