Here you can find the source of randomBoolean()
public static boolean randomBoolean()
//package com.java2s; /*// w w w .j av a 2 s . c o m * Copyright 2013 S?ven Le Mesle * * 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 { public static boolean randomBoolean() { return Math.abs(Math.random() * 1000) % 57 != 0; } }