Web Reference: An Iterator is an object that can be used to loop through collections, like ArrayList and HashSet. It is called an "iterator" because "iterating" is the technical term for looping. Mar 11, 2026 · An Iterator in Java is one of the most commonly used cursors in the Java Collections Framework. It is used to traverse or iterate through elements of a collection one by one. Obtain an iterator to the start of the collection by calling the collection's iterator ( ) method. Set up a while loop that makes a call to the hasNext ( ) method. Have the loop iterate as long as hasNext ( ) returns true. Within the while loop, obtain each element by calling the next ( ) method.
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