Here you can find the source of sleep(int millis)
static void sleep(int millis)
//package com.java2s; /**/*w ww .java2s.c o m*/ * Copyright (c) 2014 - 2017 Frank Appel * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors: * Frank Appel - initial API and implementation */ public class Main { static void sleep(int millis) { try { Thread.sleep(millis); } catch (InterruptedException shouldNotHappen) { throw new IllegalStateException(shouldNotHappen); } } }