print current threads

gistfile1.java

    public static void printThreads() {
    // Find the root thread group
        ThreadGroup root = Thread.currentThread().getThreadGroup().getParent();
        while (root.getParent() != null) {
            root = root.getParent();
        }
        // Visit each thread group
        visit(root, 0);
    }

    // This method recursively visits all thread groups under `group'.
    private static void visit(ThreadGroup group, int level) {
        // Get threads in `group'
        int numThreads = group.activeCount();
        Thread[] threads = new Thread[numThreads*2];
        numThreads = group.enumerate(threads, false);

        // Enumerate each thread in `group'
        for (int i=0; i<numThreads; i++) {
            System.out.println(threads[i].toString());
        }

        // Get thread subgroups of `group'
        int numGroups = group.activeGroupCount();
        ThreadGroup[] groups = new ThreadGroup[numGroups*2];
        numGroups = group.enumerate(groups, false);

        // Recursively visit each subgroup
        for (int i=0; i<numGroups; i++) {
            visit(groups[i], level+1);
        }
    }