if program using class treenode extends comparablekeyvaluepair
where:
root can treenode , treenode comparablekeyvaluepair therefor, root comparablekeyvaluepair,
how can declare this
treenode node; comparablekeyvaluepair tempnode; node = tempnode;
if tempnode not treenode, cannot this. if is, can write node = (treenode)tempnode. if cast fails, you'll classcastexception.
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