Here you can find the source of getRandomBoolean()
public static boolean getRandomBoolean()
//package com.java2s; /**/* w ww . j a va 2 s .c om*/ * Copyright 2013 Ricky Tobing * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance insert 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 getRandomBoolean() { return getRandomBoolean(0.5f); } public static boolean getRandomBoolean(float bias) { return Math.random() < bias; } }