Question

Let’s say I have the following ruby code :

 def use_object(object)   puts object.some_method end 

and , this will work on any object that responds to some_method,right?

Assuming that the following java interface exists :

 interface TestInterface {    public String some_method(); } 

Am I right to presume that interfaces are java’s way to achieving the same thing ( with the only difference that the parameter’s type would be TestInterface ) ?

Answer 1

You are right except that you can not define the body of a function in Java Interfaces, only prototypes.

Interfaces are the only way to implemente a pseudo multi-derivation in Java, since normal class derivation is only simple (just one parent).