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ITERATORS - PowerPoint PPT Presentation


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ITERATORS. Methods. The standard iterator has 3 basic methods. -next(): advances the iterator one element up and returns the object that it passed over. - hasNext ():returns true if there is an element after the iterator’s position, else it will return false .

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Presentation Transcript
methods
Methods
  • The standard iterator has 3 basic methods

-next(): advances the iterator one element up and returns the object that it passed over

-hasNext():returns true if there is an element after the iterator’s position, else it will return false

-remove(): removes and returns the last element that was passed over by next()

implementations
Implementations
  • Here is an example of how we can use the iterator to display every element in the list
your list with elements represented with the letter e
Your list with elements represented with the letter e

Here it is true

e1

e2

e3

e4

e5

e6

while(hasNext()) – this checks throughout the loop if there is an element following the iterator

Because it is true, we can call the next() method and advance the iterator forward

After we call next(), we call the remove() method and take away element that we passed over.

We can repeat these steps in a loops to remove all of the elements

We now add an iterator to the list by using the list.iterator() method

We can use the 3 previously mentioned methods in a loop to

systematically return and remove the elements form the list

When called the iterator always starts at the position before the first element

Once we reach the end, our list is empty and the loop finishes

huzzah
HUZZAH

NOW YOU’RE

THINKING

WITH ITERATORS