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What are the advantages when we do like this?

 
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Bartender
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Bilal, Welcome to JavaRanch

Please TellTheDetails - And what is that you want to do? Also any exceptions you have with the code?
 
bilal haider
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A is contating an object of b which is containing a hashset of A.
There is no error or exception ... I just want to know that what are the advantages of this kind of containment?
 
Bartender
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Let's say you have this:


Can you see now what it is used for?
 
bilal haider
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Thank you very much for the quick response, and moving me one step ahead.
What I understand is that Group class is containing distinct child objects.

But why we are containing group object in child object?
 
Bartender
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Its is so you can see an association from both sides. From the Group instance you know what Child object the Group contains. From the Child object, you know what Group this particular Child object belongs to.
 
Consider Paul's rocket mass heater.
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