import javax.imageio.*;
import java.awt.image.*;
import java.awt.event.*;
import java.awt.*;
import java.security.NoSuchAlgorithmException;
import java.security.MessageDigest;
import java.lang.management.*;
import java.lang.reflect.*;
import java.net.*;
import java.io.*;
import javax.swing.text.*;
import javax.swing.event.*;
import javax.swing.*;
import java.util.concurrent.atomic.*;
import java.util.concurrent.*;
import java.util.regex.*;
import java.util.List;
import java.util.zip.*;
import java.util.*;


public class main {
  static Map<Long, Thread> idToThread;
  
  public static void main(String[] args) throws Exception {
    ThreadMXBean mx = ManagementFactory.getThreadMXBean();
    
    // just for fun
    print("Total started thread count: " + mx.getTotalStartedThreadCount());
    
    boolean cpuTimeSupported = mx.isThreadCpuTimeSupported();
    print("CPU time supported: " + cpuTimeSupported);
    if (!cpuTimeSupported) fail("No CPU time info available on platform.");
    
    long[] threads = mx.getAllThreadIds();
    
    long time = now();
    List<Thread> l = getAllThreads();
    print((now()-time) + " ms for getAllThreads()");
    print(l.size() + " threads");
    
    idToThread = new TreeMap();
    for (Thread t : l)
      idToThread.put(t.getId(), t);
      
    for (long id : threads) {
      long nano = mx.getThreadCpuTime(id);
      long ms = nano/1000000;
      Thread t = idToThread.get(id);
      if (t == null)
        print("? thread not found: " + id);
      else
        print("Thread " + quote(t.getName()) + ": CPU time = " + ms + " ms");
    }
    
  }
  
  static List<Thread> getAllThreads() {
    ThreadGroup rootGroup = Thread.currentThread().getThreadGroup();
    ThreadGroup parentGroup;
    while ( ( parentGroup = rootGroup.getParent() ) != null )
      rootGroup = parentGroup;
    Thread[] threads = new Thread[rootGroup.activeCount()];
    int n;
    while ((n = rootGroup.enumerate(threads, true)) == threads.length)       threads = new Thread[threads.length*2];
    List<Thread> l = new ArrayList<Thread>(n);
    for (int i = 0; i < n; i++) l.add(threads[i]);
    return l;
  }

  static String quote(String s) {
    if (s == null) return "null";
    return "\"" + s.replace("\\", "\\\\").replace("\"", "\\\"").replace("\r", "\\r").replace("\n", "\\n") + "\"";
  }
  
  static String quote(long l) {
    return quote("" + l);
  }


static long now_virtualTime;
static long now() {
  return now_virtualTime != 0 ? now_virtualTime : System.currentTimeMillis();
}


static void print() {
  System.out.println();
}

static void print(Object o) {
  System.out.println(o);
}

static void print(long i) {
  System.out.println(i);
}

  static RuntimeException fail() {
    throw new RuntimeException("fail");
  }
  
  static RuntimeException fail(Object msg) {
    throw new RuntimeException(String.valueOf(msg));
  }
}