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Java SE 12 & JDK 12
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Hierarchy For Package java.lang.ref
Package Hierarchies:
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Class Hierarchy
java.lang.
Object
java.lang.ref.
Cleaner
java.lang.ref.
Reference
<T>
java.lang.ref.
PhantomReference
<T>
java.lang.ref.
SoftReference
<T>
java.lang.ref.
WeakReference
<T>
java.lang.ref.
ReferenceQueue
<T>
Interface Hierarchy
java.lang.ref.
Cleaner.Cleanable