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public class ThreadLister {
private static void printThreadInfo(Thread t, String indent) {
if (t == null)
return;
System.out.println(indent + "Thread: " + t.getName() + " Priority: "
+ t.getPriority() + (t.isDaemon() ? " Daemon" : "")
+ (t.isAlive() ? "" : " Not Alive"));
}
/** Display info about a thread group */
private static void printGroupInfo(ThreadGroup g, String indent) {
if (g == null)
return;
int numThreads = g.activeCount();
int numGroups = g.activeGroupCount();
Thread[] threads = new Thread[numThreads];
ThreadGroup[] groups = new ThreadGroup[numGroups];
g.enumerate(threads, false);
g.enumerate(groups, false);
System.out.println(indent + "Thread Group: " + g.getName()
+ " Max Priority: " + g.getMaxPriority()
+ (g.isDaemon() ? " Daemon" : ""));
for (int i = 0; i < numThreads; i++)
printThreadInfo(threads[i], indent + " ");
for (int i = 0; i < numGroups; i++)
printGroupInfo(groups[i], indent + " ");
}
/** Find the root thread group and list it recursively */
public static void listAllThreads() {
ThreadGroup currentThreadGroup;
ThreadGroup rootThreadGroup;
ThreadGroup parent;
// Get the current thread group
currentThreadGroup = Thread.currentThread().getThreadGroup();
// Now go find the root thread group
rootThreadGroup = currentThreadGroup;
parent = rootThreadGroup.getParent();
while (parent != null) {
rootThreadGroup = parent;
parent = parent.getParent();
}
printGroupInfo(rootThreadGroup, "");
}
public static void main(String[] args) {
ThreadLister.listAllThreads();
}
}
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