Here you can find the source of assertNotNull(Object object, String message)
public static void assertNotNull(Object object, String message) throws IllegalArgumentException
//package com.java2s; /*// w ww.j av a 2s. c o m * Copyright 2013 Balazs Berkes. * * 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 { public static void assertNotNull(Object object, String message) throws IllegalArgumentException { if (isNull(object)) { throw new IllegalArgumentException(message); } } public static boolean isNull(Object object) { return object == null; } }