通过类上的索引找到通用声明。

//package com.nowjava;
/**
来 自 n o w j a   v  a . c o m - 时  代  Java
**/

import java.lang.reflect.ParameterizedType;

import java.lang.reflect.Type;


public class Main {


    public static Class<?> getGenericClass(Class<?> clazz) {

        return getGenericClass(clazz, 0);

    }


    /**

     * Locates  generic declaration by index on a class.

     *

     * @param clazz clazz The class to introspect

     * @param index the Index of the generic ddeclaration,start from 0.

     */

    public static Class<?> getGenericClass(Class<?> clazz, int index) {

        Type genType = clazz.getGenericSuperclass();


        if (genType instanceof ParameterizedType) {
        /*
         from 时 代 J a v a 公 众 号 
        */

            Type[] params = ((ParameterizedType) genType)

                    .getActualTypeArguments();