null
meaning simply that the implementation doesn't know how to determine the parent node, rather than there is no such node.
@return The parent Tree
node or null
@see Tree#parent(Tree)
This implementation obtains this preference node's lock, checks that the node has not been removed and returns the parent value that was passed to this node's constructor. @return the parent of this preference node. @throws IllegalStateException if this node (or an ancestor) has beenremoved with the {@link #removeNode()} method.
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