ArrayList AP CSA remove loop practice
AP CSA ArrayList Remove Loop Practice
ArrayList removal questions test whether students understand that indexes change immediately. The code may compile and still skip values, remove the wrong item, or throw an index error.
Best For
When to use this page
Students who know ArrayList methods but lose points when a loop removes multiple matching elements.
Practice Prompts
Try these before moving on
1
Trace a forward loop that removes all short words from an ArrayList and explain which elements are skipped.
2
Rewrite the loop so it safely removes all matching items.
3
Compare removing into a new list versus mutating the original list in place.
Common Mistakes
What to check in your answer
Incrementing i after remove(i) when the next item shifted into the same index.
Using an enhanced for loop while changing the list.
Forgetting that remove returns the removed value and changes size.