获取类型的基础类；如果类型是变量类型，则返回null。

/**

 * Copyright (C) 2007 Asterios Raptis

 *

 * 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

 *

 * 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.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 *//**来自 nowjava.com**/

//package com.nowjava;

import java.lang.reflect.Array;

import java.lang.reflect.GenericArrayType;

import java.lang.reflect.ParameterizedType;

import java.lang.reflect.Type;


public class Main {

    /**

     * Get the underlying class for a type, or null if the type is a variable type.

     * 

     * @param type

     *            the type

     * @return the underlying class

     */

    private static Class<?> getClass(Type type) {

        if (type instanceof Class) {

            return (Class<?>) type;

        } else if (type instanceof ParameterizedType) {

            return getClass(((ParameterizedType) type).getRawType());

        } else if (type instanceof GenericArrayType) {

            Type componentType = ((GenericArrayType) type)

                    .getGenericComponentType();

            Class<?> componentClass = getClass(componentType);

            if (componentClass != null) {