In which cases is it preferable to use ArrayList instead of LinkedList?

The choice between ArrayList and LinkedList depends on the nature of operations you plan to perform with the collection:

• ArrayList is implemented based on a dynamic array. It provides fast access by index (operations get and set — O(1)). Adding elements to the end of the list is usually quick (amortized O(1)), but inserting or deleting elements in the middle or at the beginning of the list requires shifting elements (O(n)).

• LinkedList is implemented as a doubly linked list. Access by index requires traversal (O(n)), but inserting and deleting elements at the beginning, end, or middle of the list (if there is a reference to the node) is fast (O(1)).

When to prefer using ArrayList:

• If frequent access to elements by index is required.
• If insertions/deletions in the middle of the list are rare.
• If memory saving is important (ArrayList usually takes less memory than LinkedList).

Example: For storing and frequently reading a large number of elements, such as a list of users, it is better to use ArrayList.

When LinkedList might be better:

• If insertions and deletions at the beginning or middle of the list are frequent, and there is no frequent access by index.

In most cases, ArrayList is a more versatile and efficient choice.