java.lang.ThreadGroup.enumerate(Thread[] list)%uA0方法复制该线程组及其子组中的所有活动线程到指定的数组。
声明
以下是java.lang.ThreadGroup.enumerate()方法的声明
public int enumerate(Thread[] list)
参数
-
list%uA0-- 此是一个数组，把线程列表。
返回值
此方法返回放入数组中的线程的数目。
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 threads put into the array
Thread[] list = new Thread[pGroup.activeCount()]
int count = pGroup.enumerate(list)
for (int i = 0 i < count i++) {
System.out.println("Thread " + list[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... Thread Thread-0 found Thread Thread-1 found Thread-0 finished executing. Thread-1 finished executing.