Java Programming for Complete Beginners - Java 16 - Step 13 - First Look at ArrayList - an Introduction

This video introduces the concept of ArrayList in Java, highlighting its ability to dynamically add and remove elements, unlike traditional arrays. It explains how to create an ArrayList instance and demonstrates basic operations such as adding and removing elements. The video also covers the importance of type safety using generics, ensuring that all elements in an ArrayList are of the same type. The tutorial concludes with a brief overview of the discussed features and a preview of the next video, which will delve deeper into modifying arrays using ArrayList.

What is a key advantage of using an ArrayList over a traditional array in Java?

• ArrayLists are faster than arrays for all operations.

• ArrayLists allow dynamic resizing, enabling elements to be added or removed.

• ArrayLists have a fixed size that cannot be changed.

• ArrayLists can store primitive data types directly.

What warning might you encounter when adding elements to an ArrayList without specifying a type?

• NullPointerException

• ArrayIndexOutOfBoundsException

• Unchecked call to add(E)

• Type mismatch error

How can you ensure that an ArrayList only contains elements of a specific type?

• By using a type-safe cast

• By declaring the ArrayList with a specific type using generics

• By using a try-catch block

• By initializing the ArrayList with a fixed size

What happens if you try to add an integer to an ArrayList declared to hold only strings?

• The integer is added, but a runtime warning is issued.

• A compile-time error occurs, preventing the addition.

• The integer is added without any issues.

• The integer is automatically converted to a string.

Which method would you use to remove an element from an ArrayList by its index?

• removeAt()

• remove()

• delete()

• removeByIndex()