Error: The type T cannot be used in GenericTypeMatcher - Expression expected

Question

I tried to implement a generic method that will return a GenericTypeMatcher (provided by AssertJ Swing) of type parameter T. You can see the method here.

The problem is that I get an Expression expected error for the supported type of the GenericTypeMatcher with the Class<T>.

Do you have any idea how to solve it?

Answer 1

The problem here is that GenericTypeMatcher accepts a Class<T> argument.
You're passing the type definition instead, which is invalid.

private static <T extends Component> GenericTypeMatcher<T> getMatcher(final Class<T> clazz) {
   return new GenericTypeMatcher<T>(clazz) {
      @Override
      protected boolean isMatching(final T object) {
         return ...
      }
   }
}

Usage

YourClass.getMatcher(YourComponent.class);