Questions and Answers
What is a class in Object-Oriented Programming?
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?
Signup and view all the answers
What is an instance variable?
Signup and view all the answers
What is the role of an access specifier?
Signup and view all the answers
What is a return type in a method?
Signup and view all the answers
What is a parameter list in a method?
Signup and view all the answers
What are the components of a method header?
Signup and view all the answers
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
Header
- 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
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
This quiz covers the fundamental concepts of Object-Oriented Programming (OOP), including classes, objects, constructors, methods, and instance variables. Test your understanding of how these components interact in the creation and management of objects in programming.
