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Class DataStructures.PreOrder 

java.lang.Object
   |
   +----DataStructures.TreeIterator
           |
           +----DataStructures.PreOrder
public class PreOrder
extends TreeIterator
Preorder iterator class.

Constructor Index

o PreOrder(BinarySearchTree)
Construct the iterator.

Method Index

o advance()
Advance the current position to the next node in the tree, according to the preorder traversal scheme.
o first()
Set the current position to the first item, according to the preorder traversal scheme.

Constructors

o PreOrder 
  public PreOrder(BinarySearchTree theTree)
Construct the iterator. The current position is set to null.

Parameters:
theTree - the tree to which the iterator is permanently bound.

Methods

o first 
  public void first()
Set the current position to the first item, according to the preorder traversal scheme.

Overrides:
first in class TreeIterator
o advance 
  public void advance() throws ItemNotFound
Advance the current position to the next node in the tree, according to the preorder traversal scheme.

Throws: ItemNotFound
if the current position is null.
Overrides:
advance in class TreeIterator 
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