Selective Inheritance?

Moreover, it is not possible to change the visibility of inherited fields/methods from public to private.

There is the possibility to override the unwanted operations and change their behavior to e.g. display an error message or throw an exception, to indicate that the operation is not supported.

For example, following from the previous exercise, we can define Student to extend GradStudent yet not support the operations related to advisor attribute, as follows.

public class Student extends GradStudent {
    public Student(String name, String email) {
        super(name, email);
    }

    @Override
    public void setAdvisor(String advisor) {
        throw new UnsupportedOperationException();
    }

    @Override
    public String getAdvisor() {
        throw new UnsupportedOperationException();
    }
}