public interface TreeNode<T>
T
getChild(int index)
List<T>
getChildren()
int
getChildrenCount()
getFirst()
getLast()
getParent()
boolean
hasChildren()
isRoot()
T getParent()
List<T> getChildren()
T getChild(int index)
T getFirst()
T getLast()
int getChildrenCount()
boolean isRoot()
boolean hasChildren()
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