Interfaces, classes and constructors in java

Question

Here\'s something that bothers me regarding Interfaces and classes.

I\'m trying to do an implemataion for an interface called IPAddress by a class named IPAddressString.

Answer 1

You can implement IPAddress in IPAddressString. Although you are implementing all the methods of IPAddress interface in your IPAddressString class, you are not telling this to the compiler [which clearly cannot guess your intentions].

change the definition of your class to :

class IPAddressString implements IPAddress

This should solve the problem in conversion.

Now this line:

IPAddress n1= new IPAddressString (n0,n1,n2,n3);

will not give you problems since the hierarchy is established. And you can peacefully return n1.