Java tutorial
//package com.java2s; /* * Copyright 2002-2014 the original author or authors. * * 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 { private static void validateLocalePart(String localePart) { for (int i = 0; i < localePart.length(); i++) { char ch = localePart.charAt(i); if (ch != '_' && ch != ' ' && !Character.isLetterOrDigit(ch)) { throw new IllegalArgumentException( "Locale part \"" + localePart + "\" contains invalid characters"); } } } }