Iterator Concepts

Method Name	Description	Exception Case
next	Return next data element and move to next	If at end, throw runtime exception "no more elements"
hasNext	If NOT at end, return true, else false	None

Method Name

Description

Exception Case

Return next data element and move to next

If at end, throw runtime exception "no more elements"

hasNext

If NOT at end, return true, else false

None

Iterate Over an Arrayed List

This little algorithm has us visiting the entire list.

iterator = myArrayedList.toIterator()
While iterator.hasNext()
	print(iterator.next());

Iterate Over a Linked List

This little algorithm has us visiting the entire list.

iterator = myLinkedList.toIterator()
While iterator.hasNext()
	print(iterator.next());

Iterate Over a Complex Tree

This little algorithm has us visiting the complex tree.

iterator = myComplexTree.toIterator()
While iterator.hasNext()
	print(iterator.next());

Beautifully Simple Pattern

You get the idea -- using an iterator is always the same.

While iterator.hasNext()
	print(iterator.next());

BTW - Output


Given this input:
	list = [10, 20, 30, 40]
The expected output is shown