Java Reflection Generic Type from Field getGenericClass(Field f, int n)

Description

get Generic Class

License

Apache License

Declaration

public static Class<?> getGenericClass(Field f, int n) 

Method Source Code

//package com.java2s;
/*/*w ww. ja v a  2s  .com*/
 * Copyright 2008 Alberto Gimeno <gimenete at gmail.com>
 *
 *   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.
 */

import java.lang.reflect.Field;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;

public class Main {
    public static Class<?> getGenericClass(Field f, int n) {
        Type genericFieldType = f.getGenericType();
        if (genericFieldType instanceof ParameterizedType) {
            ParameterizedType aType = (ParameterizedType) genericFieldType;
            Type[] fieldArgTypes = aType.getActualTypeArguments();
            return (Class<?>) fieldArgTypes[n];
        }
        return null;
    }
}

Related

1. getGenericArgument(Field field, int index)
2. getGenericClasses(Field field)
3. getGenericElementType(Field field)
4. getGenericFieldClassType(Class clz, String propertyName)
5. getGenericFieldType(Field field, boolean isAllowNull)