AP Computer Science A Flashcards: ArrayList Traversals
Written by AP Content Team, Verified for 2026 AP Exams, Last updated: May 2026
Review key ideas with interactive flashcards. This set includes 10 cards to help you master important concepts.
What is the primary goal when developing code that traverses an ArrayList?
The primary goal is to access all or an ordered sequence of the elements and determine the results of the traversal.
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What is the primary goal when developing code that traverses an ArrayList?
The primary goal is to access all or an ordered sequence of the elements and determine the results of the traversal.
A program is intended to access every element in an ArrayList to check its value. What is the name for this process?
This process is called traversing the ArrayList.
What is a major risk of changing an ArrayList's size while traversing it with an enhanced for loop?
Changing the size of an ArrayList while traversing it using an enhanced for loop can result in a ConcurrentModificationException.
What are the two general methods mentioned for traversing the elements of an ArrayList?
The two methods mentioned are using iteration statements (like loops) or using recursive statements.
Why does deleting elements during an ArrayList traversal require special techniques?
Special techniques are required when deleting elements during a traversal to avoid skipping over subsequent elements in the list.
What is the potential negative outcome of improperly deleting elements during an ArrayList traversal?
Improperly deleting elements during a traversal can cause the program to skip over elements that should have been processed.
To avoid a ConcurrentModificationException, what actions should you NOT perform when using an enhanced for loop to traverse an ArrayList?
When using an enhanced for loop to traverse an ArrayList, you should not add or remove elements.
In the context of ArrayLists, what is a ConcurrentModificationException?
It is an exception that can be thrown if the size of an ArrayList is changed (by adding or removing elements) while it is being traversed with an enhanced for loop.
A programmer's code throws a ConcurrentModificationException while looping through an ArrayList. What is the most likely cause described in the text?
The most likely cause is that the code is adding or removing elements from the ArrayList while traversing it with an enhanced for loop.
What is traversing an ArrayList?
Traversing an ArrayList is when iteration or recursive statements are used to access all or an ordered sequence of the elements in the list.