Learn Java from Scratch - A Beginner's Guide - Step 08 - Exploring New Java API - List Set and Map - copyOf Methods

This video tutorial introduces new Java APIs, focusing on the 'copy of' method available in List, Set, and Map interfaces from Java 10 onwards. It explains how to create unmodifiable collections and demonstrates practical use cases, ensuring data integrity by preventing modifications to collections. The tutorial also covers project setup and the importance of using immutable collections in Java applications.

What is the first step in exploring new Java APIs according to the tutorial?

• Read the Java documentation

• Install the latest Java version

• Create a new Java project

• Set up a database connection

Which Java version introduced the 'copyOf' method?

• Java 11

• Java 10

• Java 9

• Java 8

What does the 'copyOf' method return when used on a List?

• A modifiable list

• An unmodifiable list

• A reversed list

• A sorted list

What is a key requirement for collections passed to the 'copyOf' method?

• The collection must be of type ArrayList

• The collection must not contain null elements

• The collection must be sorted

• The collection must be empty

How can you prevent modifications to a list before passing it to a method?

• Use a synchronized list

• Use a static list

• Use 'copyOf' to create an unmodifiable list

• Use a thread-safe list

What happens if you try to modify a list created with 'copyOf'?

• The modification is allowed

• The list is automatically resized

• The list is converted to a modifiable list

• An UnsupportedOperationException is thrown

What does 'copyOf' return if the input map is already immutable?

• An empty map

• A null value

• The same map instance

• A new copy of the map