/**
 * 在这里给出对类 ThreadList 的描述。
 * 
 * @作者（你的名字）
 * @版本（一个版本号或者一个日期）
 */
import java.lang.*;
import java.util.*;
public class ThreadList
{
    private static ThreadGroup getRootThreadGroups(){
        //获得当前线程组
        ThreadGroup rootGroup=Thread.currentThread().getThreadGroup();
        while(true){
            if(rootGroup.getParent()!=null){
                rootGroup=rootGroup.getParent(); //循环获取最终父线程
            }else{
                break;
            }
        }
        return rootGroup;
    }

    public static List<String> getThreads(ThreadGroup group){
        List<String> threadList=new ArrayList<String>();
        Thread[]threads=new Thread[group.activeCount()];//根据活动线程数创建数组
        int count=group.enumerate(threads,false);
        for(int i=0;i<count;i++){
            threadList.add(group.getName()+"线程组:"+threads[i].getName());
            //循环获取线程名到数组
        }
        return threadList;
    }

    public static List<String> getThreadGroups(ThreadGroup group){
        //从参数线程组中获取子线程组
        List<String>threadList=getThreads(group);
        ThreadGroup[]groups=new ThreadGroup[group.activeGroupCount()];
        int count=group.enumerate(groups,false);
        for(int i=0;i<count;i++){
            threadList.addAll(getThreads(groups[i]));
        }
        return threadList;
    }

    public static void main(String[]args){
        for(String string:getThreadGroups(getRootThreadGroups())){
            System.out.println(string);
        }
    }
}