CCS108 Week 1
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Questions and Answers

What does OOP stand for?

Object-Oriented Programming

Which of the following is NOT a major programming language that supports OOP?

  • C#
  • HTML (correct)
  • Java
  • Python

    • What are the two main components of an object?

    Attributes and methods

    What is the purpose of a class in OOP?

    <p>To act as a blueprint or template for creating objects.</p> Signup and view all the answers

    All objects of the same class share the same attributes and methods.

    <p>True</p> Signup and view all the answers

    The public access modifier allows a class to be accessed only from within the same package.

    <p>False</p> Signup and view all the answers

    The private access modifier allows attributes to be accessed from outside the class.

    <p>False</p> Signup and view all the answers

    What is the process of creating an object called?

    <p>Object instantiation</p> Signup and view all the answers

    What is the purpose of a setter method?

    <p>To set or change the value of a private attribute.</p> Signup and view all the answers

    What is the purpose of the this keyword in a setter method?

    <p>To differentiate the attribute from the parameter with the same name.</p> Signup and view all the answers

    What is the purpose of the void keyword in a method?

    <p>To indicate that the method does not return a value.</p> Signup and view all the answers

    Methods are also known as behaviors.

    <p>True</p> Signup and view all the answers

    What does the accessModifier in a method definition determine?

    <p>The visibility of the method.</p> Signup and view all the answers

    What does the dataType in a method definition specify?

    <p>The type of value that the method returns.</p> Signup and view all the answers

    What is the purpose of parameters in a method definition?

    <p>To receive input data from the caller of the method.</p> Signup and view all the answers

    What is a derived attribute?

    <p>An attribute that is calculated based on other attributes.</p> Signup and view all the answers

    The displayDetails() method in the Circle class has separate get() methods to retrieve individual attribute values.

    <p>False</p> Signup and view all the answers

    Private methods are accessible from outside the class that defines them.

    <p>False</p> Signup and view all the answers

    What is the objective of the Car Rental program?

    <p>To manage a single car's rental process and keep track of its status and pricing.</p> Signup and view all the answers

    What is the name of the car rental service in the programming problem?

    <p>City Wheels</p> Signup and view all the answers

    The Car class has a method named rent() to process rental requests.

    <p>False</p> Signup and view all the answers

    Which of the following attributes is NOT included in the Car class?

    <p>Color</p> Signup and view all the answers

    The calculateRentalPrice(int days) method in the Car class takes the number of days as an input.

    <p>True</p> Signup and view all the answers

    What is the name of the object created in the Main class of the Car Rental program?

    <p>calc</p> Signup and view all the answers

    What is the data type of the add() method in the Calculator class?

    <p>int</p> Signup and view all the answers

    The divide() method in the Calculator class handles division by zero gracefully.

    <p>True</p> Signup and view all the answers

    What are the two derived attributes in the Circle class?

    <p>Diameter and circumference</p> Signup and view all the answers

    The Circle class uses separate get() and set() methods for each of its attributes.

    <p>False</p> Signup and view all the answers

    If a private method in the Circle class needs to be accessible from outside the class, it can be declared as public.

    <p>True</p> Signup and view all the answers

    What is the main difference between a class and an object?

    <p>A class is a blueprint for creating objects, while an object is an instance of a class.</p> Signup and view all the answers

    Objects can be created using the new keyword.

    <p>True</p> Signup and view all the answers

    Study Notes

    Object-Oriented Programming (OOP)

    • OOP is a programming approach used in various languages like Java, C#, C++, PHP, and Ruby
    • Real-world entities (cars, animals, people) and abstract concepts (like transactions) can be represented as objects
    • Objects have attributes (properties/fields) describing their state and methods (behaviors/actions)
    • To create an object, define a class (template/blueprint) specifying attributes and methods
    • All objects of the same class share the same attributes and methods

    Introduction to OOP

    • Learning Outcomes: identify class/object components, explain OOP concepts, create simple OOP programs
    • Resources Needed: laptop/computer, Java Development Kit (JDK), Java IDE (like Eclipse or BlueJ)

    Lesson Discussion

    • OOP is a programming approach using objects with attributes (state) and methods (behavior)
    • A class is a template defining attributes and methods for objects
    • Objects of a class share those attributes and methods
    • In Java, the public keyword defines a class's visibility (accessible in any class)
    • Packages (folders of related classes) help organize code, preventing name conflicts
    • Access modifiers (like public, private, etc.) control visibility and access within a program

    Creating an Object in Java using Class Name

    • Creating objects: ClassName objectName = new ClassName();
    • objectName acts as a variable holding the object
    • Example: Dog dog1 = new Dog(); creates a Dog object named dog1

    Attributes/Encapsulation

    • Attributes are variables that describe an object
    • Encapsulation hides internal object state, controlling modifications through methods. Attributes must usually be declared as private in a class to avoid unwanted modification and ensure the integrity of the object's data structure. This leads to a better organized and maintainable codebase.
    • In a Dog class, example private attributes: breed, color
    • Setters (set methods): change attribute values (e.g., setBreed(), setColor())
      • Example usage: dog1.setColor("white");

    Accessing Attributes (Getters)

    • Getters (get methods): retrieve attribute values (e.g., getBreed(), getColor())
    • Method syntax: public dataType getAttributeName() { return attributeName; }
      • Example usage: System.out.println("dog1 is a " + dog1.getColor() + " " + dog1.getBreed());

    Methods

    • Methods (also called behaviors) define actions an object can perform
      • Example bark() and eat() methods for a Dog object

    Calculator Class

    • A Calculator class encapsulates arithmetic operations (add, subtract, multiply, divide)
    • Methods return results or perform actions, like printing error messages.

    Circle Class

    • A Circle class calculates diameter and circumference, derived from the radius. Attributes are not explicitly stored (but calculated). The displayDetails() method is used to view the relevant attributes.

    Summary

    • OOP uses classes as templates to model real-world entities
    • Objects are instances of classes
    • Attributes represent data, and methods define actions within a class

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    Related Documents

    Object-Oriented Programming Prelim Workbook PDF (2025)

    Description

    This quiz covers the fundamentals of Object-Oriented Programming (OOP) including concepts like classes, objects, attributes, and methods. You'll learn to identify the components of OOP and apply these concepts to create simple programming projects in Java. Test your understanding of how real-world entities can be modeled as objects in OOP.

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