Question

Which class can be used to declare and instantiate an ArrayList of primitive data types?

1) ArrayList
2) List
3) Collection
4) PrimitiveArrayList

Answer 1

option(!) The ArrayList class is used to create an ArrayList of objects, not primitives, but can store primitives using their associated wrapper classes like Integer and Double.

Step-by-step explanation:

The class that can be used to declare and instantiate an ArrayList of primitive data types is the ArrayList class. However, it's important to understand that ArrayList cannot directly store primitive data types like int, char, double, etc., because it works with objects and not primitive types. To store primitives in an ArrayList, one must use their wrapper classes like Integer, Character, Double, etc.

In Java, ArrayList is a dynamic array-like data structure provided by the Java Collections Framework. It allows dynamic resizing, enabling the addition and removal of elements at runtime. ArrayLists automatically handle the size management, alleviating the need for manual resizing. They provide constant-time access to elements and support various operations such as add, remove, and retrieve. ArrayLists can store objects of any type and are commonly used in Java programming for their flexibility and ease of use. However, they may have performance overhead compared to arrays in certain scenarios due to their dynamic resizing mechanism.