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Garbage Collection (Islands of isolation)

 
Ranch Hand
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Bartender
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i1 object's i instance variable referes to i2 object and i2's instance variable refers to i1 object. When you make i1 & i2 null those two objects become isolated from outside.
 
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Even though both objects still have a reference (from the other one), no other code can ever get a reference.
 
Don't get me started about those stupid light bulbs.
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