Using your own scenario from Assignment 2, identify all the objects and write out Java classes to represent each of them. A minimum of 5 objects is required.

To successfully create Java classes representing various objects based on a common scenario, let's consider a scenario involving a "Library System." This system will encompass a few objects: Book, Member, Library, Loan, and Author. Below are the steps to define the classes for each object.

1. Class: Book

public class Book {
    private String title;
    private String isbn;
    private Author author;
    private boolean isAvailable;

    public Book(String title, String isbn, Author author) {
        this.title = title;
        this.isbn = isbn;
        this.author = author;
        this.isAvailable = true; // Books are available by default
    }

    // Getters and setters
    public String getTitle() {
        return title;
    }

    public String getIsbn() {
        return isbn;
    }

    public Author getAuthor() {
        return author;
    }

    public boolean isAvailable() {
        return isAvailable;
    }

    public void setAvailable(boolean available) {
        isAvailable = available;
    }
}

2. Class: Author

public class Author {
    private String name;
    private String biography;

    public Author(String name, String biography) {
        this.name = name;
        this.biography = biography;
    }

    // Getters
    public String getName() {
        return name;
    }

    public String getBiography() {
        return biography;
    }
}

3. Class: Member

public class Member {
    private String memberId;
    private String name;
    private String email;

    public Member(String memberId, String name, String email) {
        this.memberId = memberId;
        this.name = name;
        this.email = email;
    }

    // Getters
    public String getMemberId() {
        return memberId;
    }

    public String getName() {
        return name;
    }

    public String getEmail() {
        return email;
    }
}

4. Class: Loan

import java.time.LocalDate;

public class Loan {
    private Book book;
    private Member member;
    private LocalDate loanDate;
    private LocalDate returnDate;

    public Loan(Book book, Member member, LocalDate loanDate) {
        this.book = book;
        this.member = member;
        this.loanDate = loanDate;
        this.returnDate = null; // Not returned yet
    }

    // Getters and setters
    public Book getBook() {
        return book;
    }

    public Member getMember() {
        return member;
    }

    public LocalDate getLoanDate() {
        return loanDate;
    }

    public LocalDate getReturnDate() {
        return returnDate;
    }

    public void setReturnDate(LocalDate returnDate) {
        this.returnDate = returnDate;
    }
}

5. Class: Library

import java.util.ArrayList;
import java.util.List;

public class Library {
    private List<Book> books;
    private List<Member> members;
    private List<Loan> loans;

    public Library() {
        books = new ArrayList<>();
        members = new ArrayList<>();
        loans = new ArrayList<>();
    }

    // Methods to add books, members, and loans
    public void addBook(Book book) {
        books.add(book);
    }

    public void addMember(Member member) {
        members.add(member);
    }

    public void addLoan(Loan loan) {
        loans.add(loan);
        loan.getBook().setAvailable(false); // Book is no longer available
    }
}

Final Answer

The Java classes outlined above represent a simple library system consisting of five objects: Book, Author, Member, Loan, and Library. Each class encapsulates attributes pertinent to its role and provides methods for interaction.