Here you can find the source of sleep()
private static void sleep()
//package com.java2s; /**//from w ww . j av a 2s . c om * Copyright (C) 2014 Google Inc. * * 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. */ public class Main { private static void sleep() { try { Thread.sleep(1000); } catch (InterruptedException e) { throw new RuntimeException(e); } Thread.yield(); } }