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01
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How is memory leak prevented in Observer pattern in Java?
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A.
Anonymous inner class Observer does not cause memory leak; outer class reference not held
B.
Explicit detach; WeakReference; AutoCloseable Observer; Spring bean lifecycle management prevents memory leak
C.
Observers always protected by Subject with WeakReference; cannot be collected by GC
D.
Observer pattern cannot cause memory leak; GC automatically cleans all observers
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