Interface revision

Question

Just doing some revision for a test on interfaces. I just want to try and see if i understand it correctly. So basically a constructor of a class provides an instance(Object) of a class. In a simular way, an interface defines an Objects methods. Unlike abstract classes, all methods defined in an interface should not be implemented in the interface. However, any class that implements the interface must implement all methods in it.
I think the above is pretty correct (correct me if i am wrong). Now comes some stuff i am unsure about. Is an interface defined to one particular Object? For instance, if i have a class that creates 3 individual Objects (Tottally different from each other), and this class implements an interface, are all methods supposed to be implemented for just one Object i.e. Object A implements MethodA, MethodB, MethodC, or can they be spread out between Objects i.e Object A implements MethodA, Object B implements MethodB, Object C implements MethodC?

Answer 1

I have been working on interfaces, but i am just trying to check the limitations of them. My idea was more like whether this would work
public interface bike{
public void MethodA();
public void MethodB();
public void MethodC();
public class tester implements bike{
ObjectA a = new ObjectA();  //Object classes not shown
ObjectB b = new ObjectB();
ObjectC c = new ObjectC();
a.MethodA();
b.MethodB();
c.MethodC();
}But now looking at it, i can see that wouldnt work as the methods havnt been implemented. But what would happen if i implemented the methods in the class, and then continued with what i did above. Is that ok to do or should all methods be for one Object?
Edited by: nick2price on Feb 16, 2009 3:43 PM