Question

I have next code:

class iCache<K,V> implements Map<Object, Object>
{
...//Code
}

How can I get the class name of K and V?

Answer 1

If you extend iCache and want to obtain the typer parameters you used to declare the subclass (like below):

class someCache extends iCache<Integer,Long> {
//...
}

You can find out those parameters at runtime using the following (source):

Class clazz = ((ParameterizedType) getClass()
                       .getGenericSuperclass()).getActualTypeArguments()[0];

If you provide the parameters at instantiating like this

iCache<Integer,Long> cache = new iCache<Integer,Long>();

then you are out of luck (more info).