What does "program to interfaces, not implementations" mean?

Posted by ajsie on Stack Overflow See other posts from Stack Overflow or by ajsie
Published on 2010-04-23T10:27:04Z Indexed on 2010/04/23 10:43 UTC
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design-patterns

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interfaces

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best-practices

One stumbles upon this phrase when reading about design patterns.

But I don't understand it, could someone explain this for me?

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