Here you can find the source of assertTrue(boolean condition)
private static void assertTrue(boolean condition) throws IllegalArgumentException
//package com.java2s; /**/* w w w . j a v a 2 s. c o m*/ * Copyright (c) Microsoft and contributors. All rights reserved. * <p> * 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 * <p> * 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. * <p> * See the License for the specific language governing permissions and * limitations under the License. */ public class Main { private static void assertTrue(boolean condition) throws IllegalArgumentException { if (!condition) { throw new IllegalArgumentException(); } } }