Define a multi interface Variable

Question

I want to define a variable that implement 2 interface. Imove and Ijump are 2 interface.

class b implements Imove,Ijump {...}
class a implements Imove,Ijump {...}
Imove,Ijump player = new a();
Imove,Ijump player = new b();
player.Jump();
player.Move();

• stridecolossus: You refer to the object instance either by it's class or one of the interfaces it implements, e.g. a player = new a(); or Imove player = new a(); etc
• Turing85: Alternatively, if you need something that is Imove and Ijump, you could create an interface Imoveandjump extends Imove, Ijump {} and use this. --- Some remarks on your code: class-, interface- and enum-names should always be written in CamelCase (a -> A, Imove -> IMove, Ijump -> IJump), while methods should be written in camelCase (Jump() -> jump(), Move() -> move()) --- In general, interfaces should not be prefixed (Imove -> Move, IJump -> Jump).

Answer 1

interface can inherit from (multiple) other interface with extends.

Define third interface.

interface MoveAndJump extends IMove,IJump{};

Use that third interface.

MoveAndJump player = new a();
player.jump();
player.move();