Checks if the String contains only unicode letters and space (' ').
/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You 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 { /** * <p>Checks if the String contains only unicode letters and * space (' ').</p> * * <p><code>null</code> will return <code>false</code> * An empty String ("") will return <code>true</code>.</p> * * <pre> * StringUtils.isAlphaSpace(null) = false * StringUtils.isAlphaSpace("") = true * StringUtils.isAlphaSpace(" ") = true * StringUtils.isAlphaSpace("abc") = true * StringUtils.isAlphaSpace("ab c") = true * StringUtils.isAlphaSpace("ab2c") = false * StringUtils.isAlphaSpace("ab-c") = false * </pre> * * @param str the String to check, may be null * @return <code>true</code> if only contains letters and space, * and is non-null */ public static boolean isAlphaSpace(String str) { if (str == null) { return false; } int sz = str.length(); for (int i = 0; i < sz; i++) { if ((Character.isLetter(str.charAt(i)) == false) && (str.charAt(i) != ' ')) { return false; } } return true; } }