Quiz on Classes, Objects, and Methods

What are instance variables?

• Variables that can only be accessed by the main class

• Variables declared outside any method

• Variables that are always public

• Variables declared within a method

What is the purpose of methods in programming?

• To declare variables

• To hide information

• To group statements for a specific task

• To store data permanently

What does the 'this' keyword refer to?

• The variable being declared

• The object receiving a method call

• The method being called

• The class itself

Where are local variables declared?

• Within a class

• Within a method definition

• Outside any method

• In the main class only

What is information hiding?

• Hiding all methods from users

• Restricting access to some object components

• Making all variables public

• Allowing full access to all methods

What are public modifiers?

• Modifiers that are only used in constructors

• Modifiers that allow unrestricted access

• Modifiers that restrict access

• Modifiers that are always private

What is an accessor method?

• A method that deletes data

• A method that creates new variables

• A method that returns data from a private variable

• A method that changes data

What do mutator methods do?

• They return data from a variable

• They change data in private variables

• They create new classes

• They are always public

What is encapsulation?

• Combining data and actions into a single item

• Creating multiple classes for a single task

• The process of hiding all methods

• Declaring all variables as public

What is the main benefit of information hiding?

• It prevents any access to methods

• It allows full access to all components

• It simplifies the programming process

• It makes the code more complex