Additional Notes
What happens to ArrayList performance when it resizes?
Track: Java
Topic: Collections
Focus: Collection Performance Basics
Java: Collection Performance Basics
Answer
Performance temporarily degrades. Frame the concept in practical terms so you can explain it during interview discussion.
When an ArrayList exceeds its capacity, it must resize by creating a new array and copying elements, which is an O(n) operation. For instance, if you add a large number of products to an initially small catalog, resizing can cause a temporary slowdown.
When an ArrayList exceeds its capacity, it must resize by creating a new array and copying elements, which is an O(n) operation. For instance, if you add a large number of products to an initially small catalog, resizing can cause a temporary slowdown.
Topics: Collection Performance Basics Collections Java