无法子类化最终类的主题接口

Question

import javax.security.auth.Subject;

abstract class Department extends Subject{
    String name;


}

I have this piece of code. Sadly this throws the following error: The type Department cannot subclass the final class Subject

I was reading the documentation: https://docs.oracle.com/javase/7/docs/api/javax/security/auth/Subject.html but there is nothing much on how to use it(a specific use case).

Does anyone know how you can use Subject on an abstract Class (it has to be extended by an abstract class) ?

Edit:

Edit 2: Error Using Implements:

The type Subject cannot be a superinterface of Department; a superinterface must be an interface

Answer 1

Since Subject class is a final class you won't be able to extend it. That's the purpose of the final keyword. The only way I see is wrapping the class and its methods. You won't be able to use the wrapper where the final class is required, but you can implement any interfaces which are on the final class.

ex:

final class Foo {
    public String getSomething() {
        //
    }
}

class Bar {
    Foo foo;

    public Bar() {
        foo = new Foo();
    }

    public String getSomething() {
        foo.getSomething();
    }

    public String doSomethingElse() {
        //
    }
}

Not sure it would be helpful in your scenario tho.