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Questions and Answers
What is the primary purpose of encapsulation in object-oriented programming?
What is the primary purpose of encapsulation in object-oriented programming?
What is the term for an instance of a class?
What is the term for an instance of a class?
What is the term for creating a new class based on an existing class?
What is the term for creating a new class based on an existing class?
What is the term for multiple methods with the same name but different parameters?
What is the term for multiple methods with the same name but different parameters?
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What is the term for a class containing objects of other classes?
What is the term for a class containing objects of other classes?
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What is the term for assigning a subclass object to a superclass reference variable?
What is the term for assigning a subclass object to a superclass reference variable?
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What is the first step in problem-solving in customer service?
What is the first step in problem-solving in customer service?
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What is an important aspect of effective communication in customer service?
What is an important aspect of effective communication in customer service?
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What should you do after offering a solution to a customer's problem?
What should you do after offering a solution to a customer's problem?
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Why is active listening important in customer service?
Why is active listening important in customer service?
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What should you do when communicating with customers who have disabilities or language barriers?
What should you do when communicating with customers who have disabilities or language barriers?
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Why is verifying understanding important in customer service?
Why is verifying understanding important in customer service?
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Study Notes
Object-Oriented Programming (OOP) in Java
Key Concepts
- Encapsulation: Hiding implementation details and showing only necessary information to the outside world.
- Abstraction: Focusing on essential features and hiding non-essential details.
- Inheritance: Creating a new class based on an existing class.
- Polymorphism: Objects of different classes responding to the same method call.
Classes and Objects
- A class is a blueprint or template for creating objects.
- An object is an instance of a class.
- A class defines properties (data) and methods (functions).
Inheritance
- Superclass (or parent class): The class from which another class inherits.
- Subclass (or child class): The class that inherits from another class.
- Extends keyword: Used to indicate inheritance.
- Single inheritance: A class can only inherit from one superclass.
- Multilevel inheritance: A class can inherit from a subclass that itself inherits from another class.
Polymorphism
- Method Overloading: Multiple methods with the same name but different parameters.
- Method Overriding: A subclass provides a different implementation of a method already defined in its superclass.
- Upcasting: Assigning a subclass object to a superclass reference variable.
- Downcasting: Assigning a superclass object to a subclass reference variable.
Other OOP Concepts
- Composition: A class containing objects of other classes.
- Interface: A abstract class that defines a contract for other classes to implement.
- Abstract class: A class that cannot be instantiated and is used as a base class for other classes.
- Packages: A way to group related classes and interfaces together.
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Description
Test your knowledge of Object-Oriented Programming concepts in Java, including encapsulation, abstraction, inheritance, polymorphism, and more.
