CS 002 - Advanced Object-Oriented Programming
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CS 002 - Advanced Object-Oriented Programming

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Questions and Answers

What is the primary purpose of the Runner or Driver program in the context of the LightBulb object?

  • To handle user input for the LightBulb object.
  • To serve as the entry point for the application. (correct)
  • To create multiple instances of LightBulb automatically.
  • To directly manipulate the properties of the LightBulb object.

    • In the presented Java code, what action does the command 'bulb1.turnOn()' perform?

  • It turns on the light bulb. (correct)
  • It checks the status of the bulb.
  • It creates a new instance of the LightBulb.
  • It changes the color of the bulb.

    • What will the user be prompted to input in the program?

  • The wattage of the LightBulb
  • The type of light bulb
  • The color of the LightBulb
  • The number of times to flip the switch (correct)

    • What type of loop is used in the provided code snippet?

    <p>For loop</p> Signup and view all the answers

    What will the output be right after the command 'System.out.println("Current bulb status: "+bulb1.checkStatus());' if the bulb is turned on?

    <p>The bulb is on.</p> Signup and view all the answers

    What is required for a LightBulb object to function effectively?

    <p>It needs to cooperate with other existing objects.</p> Signup and view all the answers

    How do you create an instance of a LightBulb object in the example provided?

    <p>LightBulb bulb1 = new LightBulb('white', 5);</p> Signup and view all the answers

    What method is called to turn on the LightBulb object?

    <p>bulb1.turnOn();</p> Signup and view all the answers

    What does the interpreter do after the instance of LightBulb is created?

    <p>It looks for the LightBulb class and calls the constructor.</p> Signup and view all the answers

    What type of parameters are passed when creating the LightBulb instance?

    <p>A string and an integer.</p> Signup and view all the answers

    Why can't the classes for LightBulb and BankAccount function independently?

    <p>They are designed to require interaction with other objects.</p> Signup and view all the answers

    Which of the following is not mentioned as a way to interact with objects?

    <p>By invoking constructors directly.</p> Signup and view all the answers

    What is the primary purpose of the 'new' keyword in object creation?

    <p>To allocate memory for a new object.</p> Signup and view all the answers

    Study Notes

    Running Programs with Objects

    • Objects are anthropomorphic and cannot function independently; they require collaboration with other objects to operate.
    • Interaction between objects occurs through method calls, allowing them to perform actions based on commands issued by other objects.

    LightBulb Example

    • To make a LightBulb object operational, it must be commanded by other objects.
    • Example command to turn on the LightBulb: bulb1.turnOn().
    • Before sending commands, an instance of the LightBulb must be created using the constructor with the new keyword.
    • Instance creation example: LightBulb bulb1 = new LightBulb("white", 5);, where "white" is the color and 5 is the wattage.

    Runner Class

    • A Runner or Driver program serves as the entry point for the application, containing the main method.
    • The Runner initiates interactions between different objects.

    Main Class Implementation

    • In the provided Main class example:
      • A LightBulb instance named bulb1 is created with specified parameters.
      • The light bulb is turned on using the command bulb1.turnOn(), followed by outputting its status.
      • A Scanner is used to prompt the user for input regarding how many times to flip the switch, demonstrating user interaction with the program.

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    Description

    This quiz covers Topic 1.6 of the Advanced Object-Oriented Programming course, focusing on running programs with objects. It is designed for students in the first semester of the SY 2024-2025 academic year. Test your understanding of OOP concepts and application in programming.

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