Here you can find the source of getRandomHexColor()
public static String getRandomHexColor()
//package com.java2s; /*/*from w w w . j a v a2s .c om*/ * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You 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. */ import java.awt.Color; import java.util.Random; public class Main { private static final Random random = new Random(); public static String getRandomHexColor() { float hue = random.nextFloat(); // sat between 0.1 and 0.3 float saturation = (random.nextInt(2000) + 1000) / 10000f; float luminance = 0.9f; Color color = Color.getHSBColor(hue, saturation, luminance); return '#' + Integer.toHexString(color.getRGB() & 0xffffff | 0x1000000).substring(1); } }