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Questions and Answers
What is a class in Object-Oriented Programming?
What is a class in Object-Oriented Programming?
What is an object in 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?
What is the purpose of a constructor?
To create an object and return its address.
What does a method define?
What does a method define?
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What is an instance variable?
What is an instance variable?
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What is the role of an access specifier?
What is the role of an access specifier?
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What is a return type in a method?
What is a return type in a method?
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What is a parameter list in a method?
What is a parameter list in a method?
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What are the components of a method header?
What are the components of a method header?
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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
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
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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.
