Here you can find the source of toLowerCase(final String s)
public static String toLowerCase(final String s)
//package com.java2s; //License from project: Apache License public class Main { /**/* w ww.j a v a 2 s . com*/ * GWT 1.5.3 does not support Locale in String toLowerCase. This method is used * so all calls to toLowerCase can be replaced with properly localized version. */ public static String toLowerCase(final String s) { return s.toLowerCase(); } }