L4 Collections & Arraylist

What is a dynamic array in Java?

• An array with fixed size

• An array that can resize itself when elements are added beyond its capacity

• A data structure that only supports reading elements

• A list that can store only integers

What is the main advantage of using an ArrayList over a regular array in Java?

• ArrayList allows duplicate elements

• ArrayList can grow and shrink dynamically

• ArrayList has faster access time than an array

• ArrayList can only hold primitive data types

Which of the following is the correct syntax for creating an ArrayList of integers in Java?

• ArrayList list = new ArrayList<>();

• ArrayList list = new ArrayList<>();

• ArrayList[] list = new ArrayList();

• ArrayList list = new ArrayList[10];

Which method is used to add an element to an ArrayList in Java?

• add()

• insert()

• append()

• push()

How do you initialize an empty ArrayList in Java?

• new ArrayList();

• ArrayList list = new ArrayList();

• ArrayList list();

• ArrayList list = new ArrayList();

What does the Iterable interface in Java represent?

• A collection of objects stored in an array

• A structure that can be iterated over using a for-each loop

• A class that allows only one element at a time

• A data structure that can only be iterated using an iterator

What is the default initial capacity of an ArrayList in Java?

• 10

• 1

• 5

• 20

Which of the following is NOT a part of the Java Collections Framework?

• HashMap

• HashSet

• ArrayList

• String[]

What happens when you try to remove an element from an ArrayList using its index?

• The element is removed, and the size of the list decreases by 1

• The element is removed, but the size remains the same

• It causes an exception if the element is not at the last index

• The element is replaced by null

Which of the following best describes the Collection interface in Java?

• A utility class to manipulate arrays

• A root interface of the Java Collections Framework that provides basic operations on collections

• A class that only works with ArrayList

• An interface that supports only the Map data structure