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By smhumayun
via codeoftheday.blogspot.com
Published: Jul 26 2013 / 10:48

In this post I will demonstrate the use of ‘Program To Interface’ Design Principle and Object Composition, to emulate Multiple Inheritance in Java. For a refresher on these topics, there’s a very informative post on Artima Developer where Erich Gamma, co-author of the landmark book, Design Patterns, talks with Bill Venners about two design principles: program to an interface, not an implementation, and favor object composition over class inheritance. For our example, consider different type of Employment Roles available in a typical Software Consulting Firm. To simplify things a bit, assume there are 4 roles; Developer, Tester, Architect and Project Manager. All of these are Employee(s) of the Software Consulting Form i.e. the employer.
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MCII replied ago:

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Once upon a time this approach was called Mixin. But who needs it?

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