Shripad Katta on Instagram: "Most people use ArrayList every day… but almost nobody understands what happens when it grows. This is one of the most common Java interview traps. In this Reel, I explain ArrayList Internal Working (Resizing + Capacity) in simple terms: how ArrayList uses an internal array what happens when capacity is full why resizing causes a hidden performance cost and how to avoid it by setting the initial capacity If you’re preparing for Java interviews, backend roles, or DSA