Which interface must a class implement to be used in a 'for-each' loop?IteratorIterableCollectionListIterator

Break Down the Problem

1. Identify the question's requirement regarding Java loops.
2. Understand the necessary interface that allows for iteration in a 'for-each' loop.

Relevant Concepts

A 'for-each' loop in Java can iterate over a collection of elements. The class intended for this use must implement a specific interface that facilitates this process.

Analysis and Detail

1. The correct interface for enabling iteration with a 'for-each' loop is Iterable.
2. The Iterable interface requires that a class implement the iterator() method, which returns an instance of Iterator.
3. An Iterator provides methods like hasNext() and next() to traverse through the collection.

Verify and Summarize

• The Iterable interface is designed specifically to be used in 'for-each' loops.
• As the other options (Collection, List, and Iterator) do not directly allow usage in 'for-each', they are not correct answers for this specific requirement.

Final Answer

The interface that a class must implement to be used in a 'for-each' loop is Iterable.