Here you can find the source of runThread(Runnable r)
public static synchronized void runThread(Runnable r)
//package com.java2s; /*//from w w w. j ava 2 s . c om * Copyright (C) 2016 Intel Corporation * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import java.util.concurrent.atomic.AtomicLong; public class Main { public static AtomicLong runningThreads = new AtomicLong(0); public static synchronized void runThread(Runnable r) { final Thread t = new Thread(r); t.start(); runningThreads.incrementAndGet(); Thread t1 = new Thread(new Runnable() { public void run() { try { t.join(); runningThreads.decrementAndGet(); } catch (InterruptedException e) { } } }); t1.start(); } }