Whad the hell does "iterator" mean?

Question

How does it work and where can we use it(and how?)?

Answer 1

looping in collection without keeping track of element of collection.

we use it when we want to retrieve one element after another without using loop . ( note with iterator object you can get value of each element of collection by just calling next() on each call you will get new value when exists.

//hasnext func return true when there are items in collection
//next return the current value each time when looping

ArrayList<String> collobject=new ArrayList<>();
collobject.add("java");

iterator iter=collobject.iterator();
while(iter.hasNext()){
System.out.println(iter.next());
}