2.4线程组创建

public class 线程组创建 {
    public static void main(String[] args) {
        ThreadGroup threadGroup=new ThreadGroup("my");
        threadGroup.setMaxPriority(5);
        System.out.println(threadGroup.getMaxPriority());
        //getMaxPriority() 可以通过这个函数 知道这个线程组的最大长度
        Thread t1=new Thread(threadGroup, new Runnable() {
            public void run() {
                System.out.println("线程组 子线程1");
            }
        },"T1");
        Thread t2=new Thread(threadGroup, new Runnable() {
            public void run() {
                System.out.println("线程组 子线程2");
            }
        },"T2");
        t1.start();
        t2.start();
        System.out.println(threadGroup.activeCount());
        System.out.println(threadGroup.activeGroupCount());
        System.out.println("-----------");
        threadGroup.list();
    }
}