Object-Oriented Programming Basics

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Questions and Answers

What is a class in Object-Oriented Programming?

  • A blueprint for creating objects (correct)
  • The same as an object
  • A method that performs tasks
  • A variable that holds values

What is an object in programming?

An instance of a class that can perform tasks and hold values.

What is the purpose of a constructor?

To create an object and return its address.

What does a method define?

<p>A specific behavior or task that an object can perform.</p> Signup and view all the answers

What is an instance variable?

<p>A variable in an object that holds a value.</p> Signup and view all the answers

What is the role of an access specifier?

<p>To control the visibility of classes, methods, and variables.</p> Signup and view all the answers

What is a return type in a method?

<p>It specifies what kind of data the method will return.</p> Signup and view all the answers

What is a parameter list in a method?

<p>Values passed to a method for internal use.</p> Signup and view all the answers

What are the components of a method header?

<p>Access specifier, return type, name, and parameter list.</p> Signup and view all the answers

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Study Notes

Class

  • Fundamental concept in Object-Oriented Programming (OOP)
  • Acts as a blueprint for creating objects; defines methods and instance variables
  • Contains three main components: constructors, methods, and instance variables
  • Represents a model with specific behaviors and values

Object

  • Instance of a class created during program execution
  • Capable of performing tasks and holding values as specified by its class
  • Identified by a unique name, allowing for multiple objects of the same class
  • Creation process known as instantiation, resulting in the object and a reference variable pointing to it

Constructor

  • Special component responsible for creating objects
  • Named identically to the class it belongs to
  • Typically initializes the class's instance variables when an object is created

Method

  • Defines a behavior or task for objects of a class
  • Specified within the class definition

Instance Variable

  • Holds data pertaining to an object, specified in the class definition
  • Values can change dynamically during program execution
  • The current values of all instance variables represent the state of an object

Access Specifier

  • Qualifies Java classes, methods, and variables for visibility control
  • Determines if the class, method, or variable is publicly accessible or restricted to the class (private)

Return Type

  • Specifies the kind of data a method will return when invoked
  • Part of the method header and must always be present
  • Can include primitive data types (e.g., int, double, char) and user-defined classes
  • A return type of void indicates no value is returned, often used in mutator methods

Parameter List

  • Defines values passed to a method for internal use
  • Must have specified data types and variable names in the method header
  • When invoking a method, parameters of the exact type must be included
  • Also referred to as the method's argument list
  • Composed of two parts: a header and a body
  • Class header syntax includes access specifier, class reserved word, and name
  • Method header includes access specifier, return type, name, and parameter list
  • Also known as a method's signature; differentiation between class and method headers in syntax is crucial

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