Here you can find the source of randomColor()
public static String randomColor()
//package com.java2s; /*//from www . j ava 2 s .c om * Copyright 2015 Doltech Systems Ltd. * * 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 { private static String[] colors = { "red", "blue", "white", "black", "green", "pink", "grey", "yellow" }; public static String randomColor() { return colors[(int) (Math.random() * colors.length)]; } }