Java Class Anatomy Quiz

Questions and Answers

What defines a new abstract data type?

Method

Class (correct)

Instance

Object

What is an instance of a class data type?

Object

Object-oriented programming is designing a program by discovering objects, their properties, and their ______.

relationships

What holds the data for objects?

Instance variable Signup and view all the answers

What are the code behaviors or actions that an object can perform?

Methods Signup and view all the answers

What initializes the instance variables when the object is created?

Constructors Signup and view all the answers

What is the method that is first called when a Java application executes?

main method Signup and view all the answers

What are other names for instance variables?

Attributes, fields, or properties Signup and view all the answers

Private means that only the code in this class can directly access the instance variable values.

True Signup and view all the answers

What is the term for the data and code acting on the data being wrapped together into a single unit?

Data encapsulation Signup and view all the answers

Public means that variables can only be accessed from inside the class.

False Signup and view all the answers

What is another term for a getter method in Java?

Accessor method Signup and view all the answers

What are setters or modifiers in Java commonly referred to as?

Mutator method Signup and view all the answers

Void is a return type used to indicate that the method does return something.

False Signup and view all the answers

Study Notes

Java Class Anatomy

A class serves as a blueprint to define a new abstract data type, encapsulating data and methods.
An object is an instance of a class, representing an actual entity created based on the class definition.
Object-oriented programming (OOP) emphasizes design through identifying objects, their attributes, and relationships, promoting code reusability and modularity.
Instance variables are attributes specific to an object, used to hold its data.
Methods define actions or behaviors that objects can perform, encapsulating functionality within the class.
Constructors are special methods invoked when an object is created, responsible for initializing instance variables.
The main method is the entry point of a Java application, where execution begins.
Attributes, fields, or properties are alternative terms for instance variables in a class.
The private access modifier restricts direct access to instance variables, ensuring data encapsulation and security within the class.
Data encapsulation combines data (instance variables) and methods, hiding implementation details and exposing only necessary interfaces.
The public access modifier allows methods and variables to be accessed from outside the class, facilitating interaction with the object.
An accessor method, often referred to as a getter, provides read access to private instance variables.
A mutator method, also known as a setter, modifies the value of instance variables, controlling how data is updated.
The term void indicates that a method does not return a value, simplifying the method’s structure.

Description

Test your knowledge on Java class anatomy and the basics of object-oriented programming. This quiz covers concepts such as classes, objects, instance variables, methods, and constructors. Perfect for students aiming to understand Java's foundational principles.