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Questions and Answers
What does the 'this' keyword represent within a method definition?
What does the 'this' keyword represent within a method definition?
Which term describes the mechanism for restricting access to some of the object's components?
Which term describes the mechanism for restricting access to some of the object's components?
What is the main purpose of encapsulation in Java?
What is the main purpose of encapsulation in Java?
In Java, what is a mutator?
In Java, what is a mutator?
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What does a UML Class Diagram primarily describe?
What does a UML Class Diagram primarily describe?
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Which type of method is used for comparison with objects instead of the '==' operator in Java?
Which type of method is used for comparison with objects instead of the '==' operator in Java?
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What is the main purpose of Object-Oriented Programming (OOP)?
What is the main purpose of Object-Oriented Programming (OOP)?
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How is a Class defined in Object-Oriented Programming (OOP)?
How is a Class defined in Object-Oriented Programming (OOP)?
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What does the extends keyword signify in Object-Oriented Programming (OOP) inheritance?
What does the extends keyword signify in Object-Oriented Programming (OOP) inheritance?
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What does the void keyword indicate in Java methods?
What does the void keyword indicate in Java methods?
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What is the difference between a Parameter and an Argument in Java methods?
What is the difference between a Parameter and an Argument in Java methods?
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How are Interfaces used in Object-Oriented Programming (OOP)?
How are Interfaces used in Object-Oriented Programming (OOP)?
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Study Notes
Object-Oriented Programming (OOP)
- OOP is a programming methodology that defines objects to accomplish a given task through their behaviors and interactions.
Object
- An object is a fundamental concept in OOP with characteristics or attributes.
- Objects have a state defined by the values of their attributes.
- Objects can perform actions known as behaviors, which are defined by methods.
Class
- A class is a blueprint for defining objects.
- Objects of the same kind have the same data type and belong to the same class.
- The data type of an object is the name of its class.
Inheritance
- Inheritance is a way of organizing classes that allows objects of a class to inherit properties from objects in another class.
- The
extendskeyword is used to apply inheritance.
Interface
- An interface is a program component containing the heading for a number of public methods.
- It is used by another class through the
implementskeyword.
Package
- A package is a collection of related classes and interfaces grouped together into a folder.
- Classes within a package can be used by any program or class with an import statement.
Methods
- A parameter is the list of variables in a method declaration.
- An argument is the actual value passed when a method is invoked.
- The
voidkeyword denotes that a method does not return a value. - A method is a collection of statements grouped together to perform an operation.
Variables
- Instance variables are variables declared outside the method, constructor, or any block, associated with an instance of a class.
- The
thiskeyword represents the object's name receiving the method call within a method definition. - Local variables are variables declared within a method definition, visible only to the methods in which they are declared.
Principles of OOP
- Information hiding is the mechanism for restricting access to some of the object's components to improve clarity, maintainability, and reusability.
- Encapsulation is the process of combining data and actions into a single item, grouping instance variables and methods into a class while hiding implementation details.
UML Class Diagram
- A UML class diagram describes the structure of a class by displaying the class name, variables, and methods.
Object Behavior
- Behavior refers to the actions that an object can take, defined by a piece of Java code called a method.
- An accessor is a public method that returns data from a private instance variable.
- A mutator is a public method that changes the data stored in one or more private instance variables.
- The
equalsmethod is used for comparison instead of the==operator when dealing with objects.
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Description
Test your knowledge on key concepts of Object-Oriented Programming (OOP) like objects, classes, and behaviors. Learn about the fundamental aspects of OOP methodology and its implementation in programming.
