Here you can find the source of assertNotNull(Object value)
private static void assertNotNull(Object value)
//package com.java2s; /*//from ww w. j a v a2 s . com * Copyright 2010-2015 JetBrains s.r.o. * * 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 assertNotNull(Object value) { assert value != null : "Expression must be checked before applying transformation"; } }