Here you can find the source of uncapitalize(final CharSequence s)
public static String uncapitalize(final CharSequence s)
//package com.java2s; /*/*from w w w. j a v a2s . com*/ * Copyright (c) 2015, Jean-Baptiste Giraudeau <jb@giraudeau.info> * * This file is part of "Derive4J - Annotation Processor". * * "Derive4J - Annotation Processor" 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. * * "Derive4J - Annotation Processor" 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 "Derive4J - Annotation Processor". If not, see <http://www.gnu.org/licenses/>. */ import java.util.Locale; public class Main { public static String uncapitalize(final CharSequence s) { return (s.length() >= 2) && Character.isHighSurrogate(s.charAt(0)) && Character.isLowSurrogate(s.charAt(1)) ? s.toString().substring(0, 2).toLowerCase(Locale.US) + s.toString().substring(2) : s.toString().substring(0, 1).toLowerCase(Locale.US) + s.toString().substring(1); } }