java generics, how to extend from two classes?

Question

I want to have a Class object, but I want to force whatever class it represents to extend class A and also class B. I can do

Answer 1

In java you cannot have a class which extends from two classes, since it doesn't support multiple inheritance. What you can have, is something like so:

public class A
...

public class B extends A
...

public class C extends B
...

In your generic signature, you can then specify that T must extend C: .

You could give a look at Default Methods (if you are working with Java 8), which essentially are methods declared within interfaces, and in Java, a class can implement multiple interfaces.