Here you can find the source of sleep(int millis)
public static void sleep(int millis)
//package com.java2s; /*//from w ww . ja v a2 s . co m Copyright 2008 Flaptor (flaptor.com) 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 { /** * sleeps without interruption exception */ public static void sleep(int millis) { long start = System.currentTimeMillis(); while (true) { long toWait = millis + start - System.currentTimeMillis(); if (toWait < 0) return; try { Thread.sleep(toWait); return; } catch (InterruptedException e) { e.printStackTrace(); } } } }