Question

I have an abstract test class that has two type parameters. I need to make an instance of one of the types at some point, so I defined an abstract method to get the required class.

I doc = getInputDocumentClass().newInstance();

How can I implement the abstract method Class<T1<T2>> getInputDocumentClass() in a concrete subclasses?

To return the class literal for T1 is not enough:

@Override
public Class<T1<T2>> getInputDocumentClass() {
    return T1.class;
}

cannot convert from Class<T1> to Class<T1<T2>>

There are no parameterized class literals due to type erasure.

So how can I satisfy the compiler in this case?

Answer 1

@SuppressWarnings("unchecked")
public Class<List<Integer>> getInputDocumentClass() {
    return (Class)List.class;
}