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See this thread for details.
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kathy sierra question doubt

 
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Please help me understand that how is just one object eligible for GC after //dostuff is reached
 
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Only object pointed by a1 is eligible to GC.


a2.b1 -> b1
a2.b2 ->b2
 
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Jacob please SearchFirst. This question has been asked many times in the forum. Search for "alpha beta" in the forum, you'll get a lot of good explanations...
 
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