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by vermasque
2911 days ago
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Interfaces can also provide read-only references of a instance. Consider interface Foo with accessors only and a MutableFoo implementation with accessors and mutators. The creator of the MutableFoo instance can make all sorts of changes to the instance but then pass it around as a Foo that can't be modified. Another option is to simply put all the state in the constructor so that a Foo never needs to be mutated; however, that might not be elegant in some cases state is incrementally accrued. I do acknowledge that XImpl is kinda ugly as name. |
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Until you cast the object...
You should use truly immutable data types unless you specifically need otherwise, most modern languages and libraries encourage you to do so.