HARD
PHANTOM
SOFT
WEAK
protected Reference<T, V>
createReference(T value, V handler, ReferenceQueue queue)
class Enum
name, equals, toString, hashCode, compareTo, compareTo, valueOf, getDeclaringClass, ordinal, wait, wait, wait, getClass, notify, notifyAll
class Object
wait, wait, wait, equals, toString, hashCode, getClass, notify, notifyAll
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