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Design Pattern Question

 
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hi
I have a design pattern question from 804 exam.I searched on Google as well as explored referred head first design pattern book, but didn't found any help.I know pretty enough about interface inheritance and class inheritance, but i am looking explanation in context of design pattern,if anyone knows about it ?

Section 3: Object-Oriented Design Principles

The Java Tutorials do not cover Design Patterns topics. The following references cover design patterns using the Java programming language:

Head First Design Patterns by Elizabeth Freeman, et al
Java Design Pattern Essentials by Tony Bevis

Item 2: Choose between interface inheritance and class inheritance.

 
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ankita modi. wrote:I have a design pattern question from 804 exam.I searched on Google as well as explored referred head first design pattern book, but didn't found any help.I know pretty enough about interface inheritance and class inheritance, but i am looking explanation in context of design pattern,if anyone knows about it ?


Well, assuming that last sentence is your question, then my answer would be: in general, choose interface inheritance.

Why? Here are just a couple of reasons:
1. Class inheritance imposes a lot of restrictions on subclasses and must be designed and documented carefully.
2. In Java, class inheritance is one-to-many (ie, a class can only extend one parent); interface inheritance is many-to-many.

HIH

Winston
 
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Thank you.
 
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