Here you can find the source of toLowerCase(char[] input)
public static boolean toLowerCase(char[] input)
//package com.java2s; /* Avuna HTTPD - General Server Applications Copyright (C) 2015 Maxwell Bruce//w w w .j a v a2 s . co m This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ public class Main { public static String toLowerCase(String input) { char[] inc = input.toCharArray(); if (toLowerCase(inc)) { return new String(inc); } else { return input; } } public static boolean toLowerCase(char[] input) { boolean ch = false; for (int i = 0; i < input.length; i++) { char c = input[i]; if (c >= 65 && c <= 90) { input[i] = (char) (c + 32); ch = true; } } return ch; } }