Friday, August 8, 2008

Class Immutability: Never thought of them before

"Classes should be immutable unless there's a very good reason to
make them mutable....If a class cannot be made immutable, limit its mutability as much as possible."

- Josh Bloch

I never thought of class immutability and its importance until I read Josh Bloch's statement quoted on a site about Java practices. There must be something about it that Bloch would quote such a tough statement. And it's true! A programmer must defend his class's instance variables from being changed from outside itself (except for instantiating the class, in which case you'll use a constructor or a static factory), unless there is a very good reason for it. Yeah, that is coolness to the uttermost level. Another point learned. :]

Continually learning,

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