java.lang.ThreadGroup.destroy() 方法破壞該線程組及其所有子組。此線程組必須為空，表明已被該線程組中的所有線程都停止。

聲明

以下是java.lang.ThreadGroup.destroy()方法的聲明

public final void destroy()

參數

• NA

返回值

此方法不返回任何值。

異常

• IllegalThreadStateException -- 如果該線程組不是空的，或者如果該線程組已經被破壞了。

• SecurityException -- 如果當前線程無法修改此線程組。

例子

下麵的例子顯示java.lang.ThreadGroup.destroy()方法的使用。

package com.yiibai;

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.");
   }
} 

讓我們來編譯和運行上麵的程序，這將產生以下結果：

Starting Thread-0...
Starting Thread-1...
Thread-0 finished executing.
Thread-1 finished executing.
Child ThreadGroup destroyed
Parent ThreadGroup destroyed