Java中使用ThreadGroup来表示线程组，它可以对一批线程进行分类管理，Java允许程序直接对线程组进行控制。
默认的情况下，所有的线程都属于主线程组。
public final ThreadGroup getThreadGroup()
我们也可以给线程设置分组
Thread(ThreadGroup group,Runnable target,String name)
public class IntegerDemo {
public static void main(String[] args) {
MyRunnable my = new MyRunnable();
Thread t1 = new Thread(my, "hello");
Thread t2 = new Thread(my, "world");
ThreadGroup tg1 = t1.getThreadGroup();
ThreadGroup tg2 = t2.getThreadGroup();
System.out.println(tg1.getName());// main
System.out.println(tg2.getName());// main
System.out.println(Thread.currentThread().getThreadGroup().getName());// main
}
}
class MyRunnable implements Runnable {
@Override
public void run() {
// TODO Auto-generated method stub
for (int i = 0; i < 100; i++) {
System.out.println(Thread.currentThread().getName() + ":" + i);
}
}
}
void setDaemon(boolean daemon);// 更改此线程组的后台程序状态。
public class IntegerDemo {
public static void main(String[] args) {
method();
}
private static void method() {
ThreadGroup tg = new ThreadGroup("新的线程组");
MyRunnable my = new MyRunnable();
Thread t1 = new Thread(tg, my, "hello");
Thread t2 = new Thread(tg, my, "world");
tg.setDaemon(true);// 更改此线程组的后台程序状态。
ThreadGroup tg1 = t1.getThreadGroup();
ThreadGroup tg2 = t2.getThreadGroup();
System.out.println(tg1.getName());// 新的线程组
System.out.println(tg2.getName());// 新的线程组
System.out.println(Thread.currentThread().getThreadGroup().getName());// main
}
}
class MyRunnable implements Runnable {
@Override
public void run() {
// TODO Auto-generated method stub
for (int i = 0; i < 100; i++) {
System.out.println(Thread.currentThread().getName() + ":" + i);
}
}
}
原文：http://www.cnblogs.com/denggelin/p/6347879.html