Java tutorial
//package com.java2s; /* * Copyright (C) 2014 The Android Open Source Project * * 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. */ import java.util.Locale; public class Main { /** * Converts text to lower case using {@link Locale#US}. * * @param text The text to convert. * @return The lower case text, or null if {@code text} is null. */ public static String toLowerInvariant(String text) { return text == null ? null : text.toLowerCase(Locale.US); } }