Objects, Classes, and Instances Flashcards

Questions and Answers

What is a class in programming?

Another type to store and manage data (correct)

A subroutine to manipulate data

A method to create an instance

An object made from a blueprint

What are objects in programming?

The software equivalent of a physical item that contains data and methods to manipulate that data.

What is an instance?

One specific object created with a constructor method within a class.

What are instance variables?

The data contained inside of an object. Signup and view all the answers

What are instance methods?

Subroutines written in the class that allow instances to manipulate and access its data. Signup and view all the answers

What is a constructor method?

A method used to create an instance of a class. Signup and view all the answers

What does the 'new' operator do?

It is used to create an object instance and calls the constructor method. Signup and view all the answers

What is a mutator method?

A class method that changes an instance variable, often starting with 'set'. Signup and view all the answers

What is an accessor method?

A class method that retrieves data from an object, often starting with 'get'. Signup and view all the answers

Study Notes

Classes and Objects

Class serves as a template for creating objects, defining the properties and behaviors they contain.
Often compared to a recipe or blueprint, it organizes data and methods.

Objects

Objects represent physical items in software, encapsulating both data and methods for data manipulation.
They serve as instances of classes, holding specific values and functionalities.

Instances

An instance is a unique object created from a class using the constructor method.
Represents a concrete realization of the class, akin to a specific version of an object.

Instance Variables

Instance variables store the data specific to an object, essentially holding the object's state.
Each object can have different values for its instance variables, defining its individuality.

Instance Methods

Instance methods are functions defined within a class, enabling objects to manipulate and access their instance variables.
They facilitate interaction with the object's data, enhancing functionality.

Constructor Method

The constructor method is a special function invoked to create an instance of a class.
Initializes the instance variables during the object's creation process.

Operator "new"

The "new" operator is employed to instantiate an object, effectively calling the constructor method associated with the class.
It allocates memory for the new object and prepares it for use.

Mutator Methods

Mutator methods, often prefixed with "set," allow modification of instance variables.
They provide a controlled way to change the state of an object.

Accessor Methods

Accessor methods, commonly starting with "get," enable retrieval of an object's data without altering its state.
They provide a mechanism for safe access to the instance variables, often called "getters."

Description

Test your knowledge on the concepts of objects, classes, and instances in programming. These flashcards cover key definitions and usages to help you understand how data is organized and manipulated in object-oriented programming. Perfect for students and enthusiasts looking to reinforce their understanding of these fundamental concepts.