Java Programming for Complete Beginners - Java 16 - Java Tip 12 - Nested Classes - Inner Class Versus Static Nested Clas

The video tutorial explains nested classes, focusing on inner and static nested classes. It covers the creation of these classes, their differences, and how to instantiate them. Inner classes require an instance of the enclosing class, allowing access to its variables, while static nested classes do not. The tutorial concludes with a summary of these concepts.

What is the primary focus of the video tutorial?

• Understanding Java interfaces

• Exploring nested classes in Java

• Learning about Java exceptions

• Studying Java data structures

What is a nested class in Java?

• A class that is declared outside any other class

• A class that is declared inside an interface

• A class that is declared inside another class

• A class that is declared inside a method

Which of the following is true about an inner class?

• It can be instantiated without an instance of the enclosing class

• It must be declared as static

• It cannot exist without an instance of the enclosing class

• It can access only static members of the enclosing class

How can you instantiate a static nested class?

• By creating an instance of the enclosing class first

• Directly, without an instance of the enclosing class

• By using a special keyword

• By declaring it as public

What error occurs when trying to access non-static fields from a static nested class?

• ArrayIndexOutOfBoundsException

• ClassCastException

• NullPointerException

• Static reference to a non-static field

Which type of nested class can access the member variables of the enclosing class?

• Static nested class

• Inner class

• Neither static nested nor inner class

• Both static nested and inner class

What is a key characteristic of a static nested class?

• It must be declared inside a method

• It requires an instance of the enclosing class to be instantiated

• It can access non-static members of the enclosing class

• It can be used as a separate class on its own