获取列表的元素类型

//package com.nowjava;


import java.lang.reflect.GenericArrayType;
/* 
*来 自
 nowjava - 时代Java
*/

import java.lang.reflect.ParameterizedType;

import java.lang.reflect.Type;


import java.util.List;


public class Main {

    public static Type getElementTypeOfList(final Type type) {

        if (!isTypeOf(type, List.class)) {/**来自 NowJava.com**/

            return null;

        }

        return getGenericParameter(type, 0);

    }


    public static boolean isTypeOf(final Type type, final Class<?> clazz) {

        if (Class.class.isInstance(type)) {

            return clazz.isAssignableFrom(Class.class.cast(type));

        }

        if (ParameterizedType.class.isInstance(type)) {

            final ParameterizedType parameterizedType = ParameterizedType.class

                    .cast(type);

            return isTypeOf(parameterizedType.getRawType(), clazz);

        }

        return false;

    }


    public static Type[] getGenericParameter(final Type type) {

        if (ParameterizedType.class.isInstance(type)) {

            return ParameterizedType.class.cast(type)

                    .getActualTypeArguments();

        }

        if (GenericArrayType.class.isInstance(type)) {

            return getGenericParameter(GenericArrayType.class.cast(type)

                    .getGenericComponentType());

        }

        return null;

    }


    public static Type getGenericParameter(final Type type, final