15.6. Iterating Over Collections

Try these first

1. 1.

   What can the enhanced for-loop be used for?

   Hint

   Think of a scenario where you just want to read elements.

2. 2.

   What does hasNext() do in an Iterator?

   Hint

   Recall the method’s purpose in the iteration process.

3. 3.

   Which method allows you to avoid managing indices while iterating?

   • Iterator
   • Enhanced For-Loop
   • ListIterator

   Hint

   Consider which method is specifically designed to streamline coding.

4. 4.

   True or False: You can use the remove() method with every iteration method.

   • True
   • False

   Hint

   Think about what happens when you try to modify a collection directly.

5. 5.

   Write a program that uses an enhanced for-loop to print even numbers from an array of integers.

   Hint

   Think of how to structure your loop to include a condition for even numbers.

6. 6.

   Demonstrate how to safely remove elements from an ArrayList while iterating using an Iterator.

   Hint

   Remember, `remove()` must be called on the iterator, not the list directly.