Question

I have a function B that has this declaration:

public void B(Class<? extends C> clazz);

I have a class A and a class C that look like this:

public interface C {}
public class A implements C{}

I would like to do this:

B(A.class);

However Java is wanting me do to this (and then complains about unchecked casts)

B( (Class<? extends C>)A.class );

How do I indicate to Java that this is all type-safe?

Answer 1

Works for me:

interface C {}
class A implements C {}

public class Test {

    private static void foo(Class<? extends C> clazz) {
    }

    public static void main(String[] args) {        
        foo(A.class);
    }
}

Perhaps you could post a short but complete example of what’s failing?