Here you can find the source of camelCase(CharSequence... components)
public static String camelCase(CharSequence... components)
//package com.java2s; /*//from ww w . j a v a2 s. c o m * * Copyright (c) 2014 by Malte Isberner (https://github.com/misberner). * * 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 String camelCase(CharSequence... components) { StringBuilder sb = new StringBuilder(); boolean start = true; for (CharSequence comp : components) { if (comp != null && comp.length() == 0) { if (start) { sb.append(comp); start = false; } else { sb.append(capitalizeFirst(comp)); } } } return sb.toString(); } /** * Capitalizes the first character (if existent) in the given character sequence, * and returns the result. * @param str the character sequence * @return a capitalized version of the specified character sequence */ public static String capitalizeFirst(CharSequence str) { if (str.length() == 0) { return ""; } StringBuilder sb = new StringBuilder(str.length()); sb.append(str.charAt(0)); sb.append(str.subSequence(1, str.length())); return sb.toString(); } }