class ThreadLister - from Java in a Nutshell

import java.io.*;

public class ThreadLister { // Display info about a thread.

private static void print_thread_info(PrintStream out, Thread t, String indent) {

if (t == null) return;

out.println(indent + "Thread: " + t.getName() + " Priority: " + t.getPriority() +

(t.isDaemon()?" Daemon":" Not a Daemon") + (t.isAlive()?" Is Alive ":" Not Alive"));

}

// Display info about a thread group and its threads and groups

private static void list_group(PrintStream out, ThreadGroup g, String indent) {

if (g == null) return; int num_threads = g.activeCount();

int num_groups = g.activeGroupCount();

Thread[] threads = new Thread[num_threads];

ThreadGroup[] groups = new ThreadGroup[num_groups];

g.enumerate(threads, false); g.enumerate(groups, false);

out.println(indent + "Thread Group: " + g.getName() + " Max Priority: " +

g.getMaxPriority() + (g.isDaemon()?" Daemon":" not a Daemon"));

for(int i = 0; i < num_threads; i++)

print_thread_info(out, threads[i], indent + " ");

for(int i = 0; i < num_groups; i++)

list_group(out, groups[i], indent + " ");

} // end list_group