Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

public class Main {
    private static final String LINE_SEPARATOR = System.getProperty("line.separator");

    /** Returns a {@link String} containing an enumeration of all {@link Thread}s in all {@link ThreadGroup}s. */
    public static String enumerateAllThreads() {
        ThreadGroup root = Thread.currentThread().getThreadGroup();

        // climb up the tree until we read the parent group
        while (root.getParent() != null) {
            root = root.getParent();
        }

        final StringBuffer str = new StringBuffer();
        collectThreadGroupInfo(root, str, "");

        return str.toString();
    }

    /** Collect info about a thread group */
    private static void collectThreadGroupInfo(final ThreadGroup g, final StringBuffer str, final String indent) {
        if (g == null) {
            return;
        }
        int numThreads = g.activeCount();
        int numGroups = g.activeGroupCount();
        final Thread[] threads = new Thread[numThreads * 2];
        final ThreadGroup[] groups = new ThreadGroup[numGroups * 2];

        numThreads = g.enumerate(threads, false);
        numGroups = g.enumerate(groups, false);

        str.append(indent).append("Thread Group: [").append(g.getName()).append("]  Max Priority: [")
                .append(g.getMaxPriority()).append(g.isDaemon() ? " Daemon" : "").append("]")
                .append(LINE_SEPARATOR);

        for (int i = 0; i < numThreads; i++) {
            if (threads[i] != null) {
                collectThreadInfo(threads[i], str, indent + "    ");
            }
        }
        for (int i = 0; i < numGroups; i++) {
            collectThreadGroupInfo(groups[i], str, indent + "    ");
        }
    }

    /** Collect info about a thread  */
    private static void collectThreadInfo(final Thread t, final StringBuffer str, final String indent) {
        if (t == null) {
            return;
        }
        str.append(indent).append("Thread: [").append(t.getName()).append("]  Priority: [").append(t.getPriority())
                .append(t.isDaemon() ? " Daemon" : "").append("] ").append(t.isAlive() ? "" : " Not Alive")
                .append(LINE_SEPARATOR);
    }
}