Locates generic declaration by index on a class. - Java Reflection

Java examples for Reflection:Generic

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Description

Locates generic declaration by index on a class.

Demo Code


//package com.java2s;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;

public class Main {

    public static Class<?> getGenericClass(Class<?> clazz) {
        return getGenericClass(clazz, 0);
    }/*from ww  w .jav  a 2s .  co  m*/

    /**
     * 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) {
            Type[] params = ((ParameterizedType) genType)
                    .getActualTypeArguments();

            if ((params != null) && (params.length >= (index - 1))) {
                return (Class<?>) params[index];
            }
        }
        return null;
    }
}

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