Here you can find the source of newInstance(Class cls)
public static Object newInstance(Class cls) throws InstantiationException, IllegalAccessException
//package com.java2s; /*//from ww w . ja va 2 s .c o m * Copyright 2005 Sun Microsystems, Inc. All Rights Reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Sun designates this * particular file as subject to the "Classpath" exception as provided * by Sun in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. */ public class Main { public static Object newInstance(Class cls) throws InstantiationException, IllegalAccessException { checkPackageAccess(cls); return cls.newInstance(); } public static void checkPackageAccess(Class clazz) { checkPackageAccess(clazz.getName()); } public static void checkPackageAccess(String name) { SecurityManager s = System.getSecurityManager(); if (s != null) { String cname = name.replace('/', '.'); if (cname.startsWith("[")) { int b = cname.lastIndexOf('[') + 2; if (b > 1 && b < cname.length()) { cname = cname.substring(b); } } int i = cname.lastIndexOf('.'); if (i != -1) { s.checkPackageAccess(cname.substring(0, i)); } } } }