🚀 go-pugleaf

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Probably you already have meet the terms "is-a", "has-a" and
"acts-as". Those terms are very common in Java parlance.
When you declare a class B that extends class A you are saying
that class B "is-a" class A with other things. That�s inheritance and
oposite to a "has-a" approach where one class has a instance of another
class as member.
Interfaces in Java is a implementation to the "act-as" approach.
Consider the interface DataInput in java.io package. Any class
that intends to act as data input for a program implements this
interface (such as various classes in JDK 1.1 core API). In your program 
you can declare a instance of DataInput meaning any class
that implements such interface can be referenced by that instance.
It doesn�t matter if input will be the network or a file in local
disk or keybord. Your program just knows what it needs: the input
methods signatures.

Sds,

Julio Junki Shinzato

Blake Williams wrote:
> 
> To add another question, what is the point of using an interface? To my
> knowledge, an interface only predefines the method names you must write,
> but doesn't provide any code. If you have to write the methods anyway,
> why would you want to inherit an interface? Wouldn't it make more sense
> to just write the methods within your class and have complete freedom to
> write them to best fit your situation? please clarify. Thanks.
> 
> Blake Williams
> 
> Bruno da Silva Bozza wrote:
> 
> >     Does anyone know why there is multiple interface inheritance in
> > Java, but not multiple class inheritance.
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