Here you can find the source of getConstructor(String type, Class[] paramTypes)
public static Constructor<?> getConstructor(String type, Class<?>[] paramTypes) throws ClassNotFoundException, NoSuchMethodException
//package com.java2s; /*/*from w w w . j av a 2s .c o m*/ GRANITE DATA SERVICES Copyright (C) 2007 ADEQUATE SYSTEMS SARL This file is part of Granite Data Services. Granite Data Services is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. Granite Data Services 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, see <http://www.gnu.org/licenses/>. */ import java.lang.reflect.Constructor; public class Main { public static Constructor<?> getConstructor(String type, Class<?>[] paramTypes) throws ClassNotFoundException, NoSuchMethodException { return getConstructor(forName(type), paramTypes); } public static <T> Constructor<T> getConstructor(Class<T> type, Class<?>[] paramTypes) throws NoSuchMethodException { return type.getConstructor(paramTypes); } public static Class<?> forName(String type) throws ClassNotFoundException { return Thread.currentThread().getContextClassLoader().loadClass(type); } @SuppressWarnings("unchecked") public static <T> Class<T> forName(String type, Class<T> cast) throws ClassNotFoundException { return (Class<T>) Thread.currentThread().getContextClassLoader().loadClass(type); } }