Java Programming for Complete Beginners - Java 16 - Step 03 - Create a Method in a Java Class

The video tutorial explains how to create and use methods within a class in programming. It starts with defining a simple method in a Planet class, demonstrating how to make instances of the class perform actions like revolving. The tutorial highlights the importance of using objects to invoke methods and addresses common errors related to static context. An exercise is provided to implement a similar method in a Country class, reinforcing the concept of methods as actions on class instances.

What is the primary purpose of creating instances of a class?

• To define new classes

• To store static data

• To execute the main method

• To perform actions defined by methods

What is the return type of the 'revolve' method defined in the class?

• boolean

• int

• String

• void

Why do we need to recreate instances after modifying a class?

• To update the class name

• To add new methods

• To reset the class variables

• To change the class type

How can you call a non-static method from outside its class?

• Using a global variable

• Using the class name directly

• Using an instance of the class

• Using a static reference

What error occurs when trying to call a non-static method using the class name?

• Array index out of bounds

• Non-static method cannot be referenced from a static context

• Null pointer exception

• Syntax error

What is the purpose of the 'coming soon' method in the country class?

• To initialize country variables

• To print a message indicating future actions

• To calculate the population

• To define the country's area

Which of the following is an example of an action that can be performed on a class instance?

• Defining a new class

• Creating a static variable

• Changing the class name

• Calling a method like 'revolve'