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Composite design pattern understanding issue

 
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Hi All,
I am having some difficulty in understanding Composite design pattern.


Questions:
1) Firstly, what is the  part-whole hierarchy ?
2) When would you use this design pattern ?

 
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Old users coming back from time to time, welcome back

Please try to read here, I found this easy readable.
In case you don't understand some of the parts explained there - try to ask again.

By the way, answers to your questions are there. As I presume these are homework questions, we can't give you direct answers.
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