Using the iterator over the same set more than once in java

Question

Say I\'m iterating over a set in java, e.g.

Iterator<_someObject_> it = _someObject_.iterator();

well, first I want to go through eve

Answer 1

It's true that iterators are single use only, but there is a class called ListIterator that allows you to do this by looking back on the list. An example would be:

ArrayList list = new ArrayList();
list.add("hey!");
list.add("how");
list.add("are");
list.add("you?");
ListIterator it = list.listIterator();
while(it.hasNext()){
   System.out.println(it.next() +" ");//you print all the elements
}
//Now you go back. You can encapsulate this while sentence into a void reset method.
while(it.hasPrevious()){
   it.previous();
}
//Now you check that you've reached the beginning of the list
while(it.hasNext()){
   System.out.println("back " + it.next() +" ");//you print all the elements
}

I think it could be useful for you that class.