Here you can find the source of getPositiveInt()
public static int getPositiveInt()
//package com.java2s; /**//from w ww. java 2s. c o m * Logback: the reliable, generic, fast and flexible logging framework. * Copyright (C) 1999-2013, QOS.ch. All rights reserved. * * This program and the accompanying materials are dual-licensed under * either the terms of the Eclipse Public License v1.0 as published by * the Eclipse Foundation * * or (per the licensee's choosing) * * under the terms of the GNU Lesser General Public License version 2.1 * as published by the Free Software Foundation. */ import java.util.Random; public class Main { private static Random random = new Random(); public static int getPositiveInt() { int r = random.nextInt(); if (r < 0) { r = -r; } return r; } }