FRQ for POJO

• Question 2: POJO (Unit 5)
• Question 2: POJO FRQ Frading Rubric (Unit 5)

Question 2: POJO (Unit 5)

Situation: You are developing a system to manage a small personal library. Each book in the library is represented by a POJO called Book .

(a) Explain the concept of a POJO in Java and provide an example scenario where using POJOs is beneficial in a programming task.

(b) Code:

You need to implement a class Library that maintains a collection of Book objects. The Book class has already been defined with the following private instance variables: title (a String representing the title of the book), author (a String representing the author of the book), and yearPublished (an int representing the year the book was published). The class has the corresponding getters for these variables.

Write the POJO class Book including a no-argument constructor, a constructor with parameters to initialize all the fields, getters for all the instance variables, and a toString() method that returns a String in the format “Title by Author (Year)”.

Implement the Library class with the following methods:

• addBook(Book newBook): A method that takes a Book object and adds it to the library’s collection.
• getOldestBook(): This method returns the Book that was published the earliest in the collection.
• toString(): This method returns a String with all books’ details in the library, each separated by a newline character.

Question 2: POJO FRQ Frading Rubric (Unit 5)

(a) Explanation and Scenario:

• 1 point: Provides a clear explanation of POJOs in Java and presents a relevant scenario.

(b) Code Implementation:

• POJO Class Book:
  • No-argument Constructor: 0.5 points
  • Parameterized Constructor: 0.5 points
  • Getters: 1 point
  • toString() Method: 0.5 points
• Class Library Implementation:
  • addBook Method: 1 point
  • getOldestBook Method: 1 point
  • toString() Method: 1 point