Interface variable to class

I need to have a variable of the type of whatever class implements an interface.

For example:

Code:

---

public interface Foo{
    public classThatImplementsFoo foo;
}

public class Bar implements Foo{
    public Bar foo;
}

---

Bar would be classThatImplementsFoo.

How do I do this?

I'm not exactly sure what you are trying to do here.

But it seems like you want to use generics.

Usually, when I want an interface to know about a member variable, in the interface, I have

public <T> getFoo();

and in the implementing class, it has

private Baz aFoo
public <T> getFoo() { return aFoo;}

Code:

---

public class Bar implements Foo { ... }

---

Or what do you mean?

No, I just lazily typed it in wrong. Obviously I wanted to use the interface.

I need to have an interface that has a variable of the type of the class which implements that interface. I'll call this pretend variable foo. So, if class Foo implements said interface, Foo would need to have a variable named foo of type Foo. Similarly, if class Bar implements said interface, Bar would need to have a variable named foo of type Bar. Similarly, if class T implements said interface, T would need to have a variable named foo of type T.

How do I do this?

How about entering it properly. No lazy typing, so we can tell what you are trying to do

Have you looked at generics?

google for "java generics"

No, I can get around doing what I need. Generics is not what I need. I don't think I can actually do what I wanted to do.

Thank you.

How about an Abstract class.