Java tutorial
//package com.java2s; /* * Copyright (c) 2015 [1076559197@qq.com | tchen0707@gmail.com] * * 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 { /** * return if str is empty * * @param str * @return */ public static boolean isEmpty(String str) { return str == null || str.length() == 0 || str.equalsIgnoreCase("null") || str.isEmpty() || str.equals(""); } }