genralization or composition
[241 byte] By [zbadra] at [2007-9-28 15:04:53] 
hi,i have a class which have to perfom somes processes on a set of object.i want to know if it's better to extend HashSet (by exple) or to use it in my classe as a private attribute.thanx in advance. badr.
In general, if your class "is a" HashSet (for example), then it is appropriate to extend HashSet, otherwise you should wrap and delegate to it. There is a nice discussion of this topic in "Effective Java".Hope that helpsLee
tsitha at 2007-7-12 11:47:46 >
Unless you need to enhance or possibly change the behavior of the HashSet it is better to have a class that contains a HashSet internally and presents an external interface similar to the HashSet. This type of a design pattern implementation is called an Adapter.
Based on my experience there has only been a couple of times where I have felt it was necessary to extend one of the Collection classes. Most of the time I go for the adapter.
jonathanhousea at 2007-7-12 11:47:46 >
thank you all ;-)
zbadra at 2007-7-12 11:47:46 >
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