๐ Topic Summary
Arrays and ArrayLists are both used to store collections of data in Java, but they differ significantly in their flexibility and functionality. Arrays are fixed-size data structures, meaning their size must be specified when they are created and cannot be changed later. ArrayLists, on the other hand, are dynamic, allowing you to add or remove elements as needed. This flexibility comes at the cost of some performance overhead compared to arrays.
Choosing between arrays and ArrayLists depends on the specific requirements of your program. If you know the size of your collection in advance and performance is critical, arrays are a good choice. If you need a dynamic collection that can grow or shrink as needed, ArrayLists are the better option.
๐ง Part A: Vocabulary
Match each term with its correct definition:
| Term |
Definition |
| 1. Array |
A. A dynamic data structure that can grow or shrink. |
| 2. ArrayList |
B. A fixed-size data structure that stores elements of the same type. |
| 3. Index |
C. The process of increasing the size of an ArrayList when it's full. |
| 4. Resizing |
D. A method to add elements to an ArrayList. |
| 5. add() |
E. The position of an element within an array or ArrayList. |
โ๏ธ Part B: Fill in the Blanks
Complete the following paragraph using the words provided: fixed-size, dynamic, ArrayList, Array, elements.
An ______ is a ________ data structure, meaning its size cannot be changed after creation. In contrast, an ________ is ________, allowing you to add or remove ________ as needed.
๐ค Part C: Critical Thinking
Explain a scenario where using an Array would be more efficient than using an ArrayList in Java. Justify your answer.