Java Reflection Generic Type from Class getGenericTypeOfParameter(Class clazz, String method, int parameterIndex)

Description

get Generic Type Of Parameter

License

Open Source License

Declaration

public static Class<?> getGenericTypeOfParameter(Class<?> clazz, String method, int parameterIndex) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.lang.reflect.Method;
import java.lang.reflect.ParameterizedType;

import java.util.HashSet;

import java.util.Set;

public class Main {
    public static Class<?> getGenericTypeOfParameter(Class<?> clazz, String method, int parameterIndex) {
        try {/*from   www.  j a  v a 2s.  co m*/
            Method m = clazz.getMethod(method, new Class<?>[] { Set.class, int.class });
            ParameterizedType type = (ParameterizedType) m.getGenericParameterTypes()[parameterIndex];
            return (Class<?>) type.getActualTypeArguments()[0];
        } catch (Exception e) {
            try {
                Method m = clazz.getMethod(method, new Class<?>[] { HashSet.class, int.class });
                ParameterizedType type = (ParameterizedType) m.getGenericParameterTypes()[parameterIndex];
                return (Class<?>) type.getActualTypeArguments()[0];
            } catch (Exception ex) {
                ex.printStackTrace();
            }
        }

        return null;
    }
}

Related

1. getGenericTypeArgumentsOfInheritedType(final Object object, final Class inheritedType)
2. getGenericTypeClass(Class clazz, int index)
3. getGenericTypeClasses(List> genericTypeClasses, Type... genericTypes)
4. getGenericTypeForMapProperty(Class javaClass, String propertyName, boolean isKeyType)
5. getGenericTypeOfInterface(Class clazz, Class specificInterface)
6. getGenericTypeParameter(Class aClass, Class genericClass, int index)
7. getGenericTypes(Class c)
8. getGenericTypes(Class clazz)
9. getGenericTypes(final Class iClass)