Iterator2 methods for traversal using the Iterator interface of the container class

Iterator2 methods for traversal using the Iterator interface of the container class

All the container classes that implement the Collection interface have an iterator method to return an object that implements the Iterator interface. The Iterator object is called an Iterator.

You can use Iterator to traverse a set in two ways.

Method 1: Use whether there is a next element as the condition for the while LOOP

1 Iterator iter = set. iterator (); 2 while (iter. hasNext () {3 String str = (String) iter. next (); 4 System. out. println (str); 5}

Method 2: Use the for Loop

1 for (Iterator iter = set. iterator (); iter. hasNext ();) {2 String str = (String) iter. next (); 3 System. out. println (str); 4}