What is List Iterator in java || java tutorials || List Iterator ||
Hello everyone..
In this session let us look at the 'List Iterator' Concept.So far we've seen to iterate over an arraylist or linkedlist quickly to retrieve the elements..We can use the modified for loop, the special for loop saying for each element, in the collection of elements and then retrieve the values, but say we want to do some more operations when we iterate like, Add the values or update existing values or remove the existing elements from the list. So to do all these methods when we iterate over a list.. List Iterator is very useful. Let us see how we can create the list iterator object here and let us see how we can iterate over a list in the given order and in the reverse order. So that is also possible when you use a list iterator you can iterate over a list in the reverse order as well. So let's create a list iterator... so list iterator which is the interface over here. The object name, let me give it as itr and then list which is the name of the object that we're using an list.listiterator.. So itr will be created as a list iterator object and we need to import the list iterator from Java.util Now using this itr object and next, has next, previous and has previous methods. We can iterate over in the given order or in the reverse order..Now next will give us the next value in the list. Now when you create the list iterator by default the cursor is set before the beginning of the list. So say cursor is automatically set before the beginning and when you say list has next element it'll say yes there is next element available and then when you ask for the next element it'll give you the next. So for example if you do something like while itr.hasNext and run the loop until the list has next element available, list will run from the head to tail of the elements. Now as I set in the beginning cursor is before the first element.
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