class Main {
public static void main(String[] args) throws Exception {
ThreadGroup tg = Thread.currentThread().getThreadGroup();
MyThread mt1 = new MyThread(tg, "first");
MyThread mt2 = new MyThread(tg, "second");
mt1.start();
mt2.start();
ThreadGroup parent = tg.getParent();
Thread[] list = new Thread[parent.activeCount()];
int count = parent.enumerate(list, true);
String[] thdinfo = new String[count];
for (int i = 0; i < count; i++)
thdinfo[i] = list[i].toString();
mt1.join();
mt2.join();
for (int i = 0; i < count; i++)
System.out.println(thdinfo[i]);
}
}
class MyThread extends Thread {
MyThread(ThreadGroup tg, String name) {
super(tg, name);
}
public void run() {
for (char c = 'A'; c <= 'Z'; c++)
System.out.println(c);
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
}
}
}