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Posted on 2011-04-25
Medium Priority
Last Modified: 2012-05-11

Interfaces allow the construction of nonhierarchical type frameworks.I have not clearly understood this statement, concept.
Please advise. Any ideas, sugestions, sample code, links, resources highly appreciated. thanks in advance
Question by:gudii9
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Expert Comment

ID: 35463797
I once wrote a lot about interfaces in response to one of the EE questions, you may
read it here:
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Assisted Solution

for_yan earned 800 total points
ID: 35463806
Interfaces allow the construction of nonhierarchical type frameworks -
this statement emphasizes that if inheritance in Java implies
strictly hierarchical structure because a class can inherit only
from one class, interfaces allow to attribute to a Java class
proprties of a wide range of types - a class can implement
as many interfaces as you like, which creates a network of connections between
types/classes which does not need to be hierarchical
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Assisted Solution

objects earned 200 total points
ID: 35463884
LVL 28

Accepted Solution

dpearson earned 1000 total points
ID: 35465496
A hierarchy is when class A extends B extends C.  A is derived from B which is derived from C.  It's a chain where each class has a single parent.  This means it's a hierarchy and is how Java does inheritance.

With interfaces, you're allowed to implement multiple interfaces at once.  So we can have:
class A implements I,J,K
class B implements I,J,K

both A and B implement the same classes, but they're not related to each other at all.  They don't have any of the same parent classes, so they're not part of a hierarchy.  It might look like they are derived from I,J,K - but they're implementing the interfaces, not deriving from classes.


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