Java Reflection Generic Type from Field getGenericArgument(Field field, int index)

Description

get Generic Argument

License

Apache License

Declaration

public static Class getGenericArgument(Field field, int index) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

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

public class Main {
    public static Class getGenericArgument(Field field, int index) {
        final Class entryType;
        Type genericType = field.getGenericType();
        if (genericType instanceof ParameterizedType) {
            Type[] typeArgs = ((ParameterizedType) genericType).getActualTypeArguments();
            if (typeArgs != null && typeArgs.length > index) {
                if (typeArgs[index] instanceof Class) {
                    entryType = (Class) typeArgs[index];
                } else {
                    entryType = Object.class;
                }/*from  ww w  .  jav  a  2 s. c  o m*/
            } else {
                entryType = Object.class;
            }
        } else {
            entryType = Object.class;
        }
        return entryType;
    }
}

Related

1. getGenericClass(Field f, int n)
2. getGenericClasses(Field field)
3. getGenericElementType(Field field)
4. getGenericFieldClassType(Class clz, String propertyName)