Here you can find the source of assertTrue(String msg, boolean value)
public static void assertTrue(String msg, boolean value)
//package com.java2s; /**// ww w .j ava2 s . com * <copyright> * * Copyright (c) 2005, 2006, 2007, 2008 Springsite BV (The Netherlands) and others * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors: * Martin Taal - Initial API and implementation * * </copyright> * * $Id: AssertUtil.java,v 1.7 2009/03/30 07:53:04 mtaal Exp $ */ public class Main { /** AssertTrue with message */ public static void assertTrue(String msg, boolean value) { if (!value) { throw new AssertionError(msg); } } }