检查给定的类“ clazz”是否覆盖类“ base Clazz”中的给定方法。

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 * Copyright (c) 2007-2011, JAGaToo Project Group all rights reserved.

 * 

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are met:

 * 

 * Redistributions of source code must retain the above copyright notice,

 * this list of conditions and the following disclaimer.

 * 

 * Redistributions in binary form must reproduce the above copyright notice,

 * this list of conditions and the following disclaimer in the documentation

 * and/or other materials provided with the distribution.

 * 

 * Neither the name of the 'Xith3D Project Group' nor the names of its

 * contributors may be used to endorse or promote products derived from this

 * software without specific prior written permission.

 * 

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE

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 */

//package com.nowjava;/**时代Java公众号 - N o w J a  v a . c o m**/

import java.lang.reflect.Method;


public class Main {

    public static void main(String[] argv) throws Exception {

        Class baseClazz = String.class;

        Class clazz = String.class;

        String methodName = "nowjava.com";

        Class parameterTypes = String.class;

        System.out.println(overridesMethod(baseClazz, clazz, methodName,

                parameterTypes));

    }


    /**

     * Checks, whether the given Class 'clazz' overrides the given method in the Class 'baseClazz'.

     * 

     * @param baseClazz the Class declaring the base method

     * @param clazz the sub class possibly overriding the method

     * @param methodName the name of the method

     * @param parameterTypes the parameters of the method

     * 

     * @return <code>true</code>, if the class overrides the given method, <code>false</code> if not, null, if the method doesn't exist or another error occurrs.

     */

    public static Boolean overridesMethod(Class<?> baseClazz,/* 来自 n  o  w  j  a  v  a . c o m*/

            Class<?> clazz, String methodName, Class<?>... parameterTypes) {

        Method m = findMethod(clazz, methodName, parameterTypes);


        if (m == null)

            return (null);


        return (m.getDeclaringClass() != baseClazz);

    }


    /**

     * Gets the method from the given class without exceptions and also searches super classes.

     * 

     * @param clazz

     * @param methodName

     * @param parameterTypes

     * 

     * @return the method or null, if it doesn't exist or other problems occurr.

     */

    public static Method findMethod(Class<?> clazz, String methodName,

            Class<?>... parameterTypes) {

        Method m = getPublicMethod(clazz, methodName, parameterTypes);


        if (m != null)

            return (m);


        return (findMethod_(clazz, methodName, parameterTypes));

    }


    /**

     * Gets the public method from the given class without exceptions.

     * 

     * @param clazz

     * @param methodName

     * @param parameterTypes

     * 

     * @return the method or null, if it doesn't exist or other problems occurr.

     */

    public static Method getPublicMethod(Class<?> clazz, String methodName,

            Class<?>... parameterTypes) {

        Method m = null;


        try {

            m = c