java.lang.ThreadGroup.enumerate(ThreadGroup[] list)%uA0方法复制到该线程组中指定的数组引用的所有活动子组。
声明
以下是java.lang.ThreadGroup.enumerate()方法的声明
public int enumerate(ThreadGroup[] list)
参数
-
list%uA0-- 这是一个数组，放置线程组的列表。
返回值
此方法返回放入数组线程组的数目。
异常
-
SecurityException%uA0-- 如果当前线程没有权限来枚举此线程组。
例子
下面的例子显示java.lang.ThreadGroup.enumerate()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() // returns the number of thread groups put into the array ThreadGroup[] grpList = new ThreadGroup[pGroup.activeGroupCount()] int count = pGroup.enumerate(grpList) for (int i = 0 i < count i++) { System.out.println("ThreadGroup " + grpList[i].getName() + " found") } // block until the other threads finish t1.join() t2.join() } 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.") } }
让我们来编译和运行上面的程序，这将产生以下结果：
Starting Thread-0... Starting Thread-1... ThreadGroup Child ThreadGroup found Thread-0 finished executing. Thread-1 finished executing.