iterators

Question

i don't understand Iterators number 2, whats the answer?

Answer 1

https://en.m.wikipedia.org/wiki/Iterator

Have a look

Answer 2

Here in the java doc you can see the methods you can use with an iterator https://docs.oracle.com/javase/8/docs/api/java/util/Iterator.html

And here is a well explained example https://www.w3schools.com/java/java_iterator.asp

If you still have trouble to understand it I recommend the video by telusko for the iterator interface https://youtu.be/O6DpXvlwWYg