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

The 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 like 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 focus on modifying arrays stored in an ArrayList.

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

• ArrayLists can store primitive data types directly.

• ArrayLists have a fixed size.

• ArrayLists allow dynamic resizing.

• ArrayLists do not require memory allocation.

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

• Array index out of bounds

• Type mismatch error

• Unchecked call to add

• Null pointer exception

How can you ensure that an ArrayList only contains strings?

• By using a try-catch block

• By manually checking each element before adding

• By declaring the ArrayList with a specific type using generics

• By using a for loop to check each element

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

• The integer is automatically converted to a string

• The integer is added without any issues

• A compile-time error occurs

• The integer is ignored

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

• removeAt()

• removeByIndex()

• delete()

• remove()