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Author: TheComputationalCore

1.a.png

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+package Task3;
+
+import java.util.Scanner;
+
+// creating a class Book
+public class Book {
+	// creating the attributes
+	private int bookId;
+	private String author;
+	private String title;
+	private boolean isAvailable;
+	
+	// creating default constructor
+	public Book() {
+		super();
+	}
+	
+	// creating parameterized constructor
+	public Book(int bookId, String author, String title, boolean isAvailable) {
+		super();
+		this.bookId = bookId;
+		this.author = author;
+		this.title = title;
+		this.isAvailable = isAvailable;
+	}
+
+   // creating getters and setters
+	public int getBookId() {
+		return bookId;
+	}
+	public void setBookId(int bookId) {
+		this.bookId = bookId;
+	}
+	public String getAuthor() {
+		return author;
+	}
+	public void setAuthor(String author) {
+		this.author = author;
+	}
+	public String getTitle() {
+		return title;
+	}
+	public void setTitle(String title) {
+		this.title = title;
+	}
+	public boolean isAvailable() {
+		return isAvailable;
+	}
+	public void setAvailable(boolean isAvailable) {
+		this.isAvailable = isAvailable;
+	}
+	
+	// creating a method bookMenu
+	public void bookMenu() {
+		Scanner sc = new Scanner(System.in);
+	    System.out.println("1: Enter Id of a Book : ");
+	 
+	    this.bookId = sc.nextInt();
+	    System.out.println("2: Enter Book Author : ");
+	  
+	    this.author = sc.next();
+	    System.out.println("3: Enter Book Title : ");
+	  
+	    this.title = sc.next();
+	   
+	}
+
+    // creating toString
+	@Override
+	public String toString() {
+		return "Book [bookId=" + bookId + ", author=" + author + ", title=" + title + "]";
+	}
+	
+	
+	
+	
+}

1.b.png

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+package Task3;
+
+import java.util.Scanner;
+// creating a class that has main method
+public class BookManagementSystem {
+	    public static void main(String[] args) {
+	        Library library = new Library();
+
+	      
+	        do {
+	            library.displayMainMenu();
+	            Scanner sc = new Scanner(System.in);
+	            System.out.println("Enter your choice: ");
+	            System.out.println("******************************");
+	            int choice = sc.nextInt();
+	            if (choice == 1) {
+	                Book book = new Book();
+	                book.bookMenu();
+	                library.addBook(book);
+	            }else if (choice == 2) {
+	                System.out.println("Enter the books id that you want to search : ");
+	                int userChoice = sc.nextInt();
+	                int indexUser = library.findBook(userChoice);
+	                System.out.println("The book with the given id is: " + "\r\n" + library.getBook(library.findBook(userChoice)));
+	            }else if (choice == 3) {
+	                System.out.println("Enter the books Id Number that you want to Delete : ");
+	                int userChoice = sc.nextInt();
+	                Book book = library.getBook(library.findBook(userChoice));
+	                library.removeBook(book);
+	            } else if(choice == 4) {
+	                library.getAllBook();
+	            }
+	        } while (true); 
+	  }
+	}
+
+

1.c.png

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+package Task3;
+// creating a class employee
+public class Employee implements Taxable{
+	
+	int EmployeeId;
+	String name;
+	float salary;
+	
+// creating a parameterized constructor
+	public Employee(int employeeId, String name, float salary) {
+		super();
+		EmployeeId = employeeId;
+		this.name = name;
+		this.salary = salary;
+	}
+
+// implementing the abstract method to calculate incomeTax
+	@Override
+	public void calcTax() {
+		float calcTax = (incomeTax * salary) / 100;
+		System.out.println("The IncomeTax of the employee is : " + calcTax);
+	}
+}

1.d.png

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+package Task3;
+
+// creating a library class
+public class Library {
+	// creating attributes 
+	Book[] books;
+	public int count;
+
+    // creating default constructor
+	public Library() {
+	  
+	    books = new Book[5];
+	    count = 0;
+	}
+
+    // creating a method to count the number of books
+	public int countBooks() {
+	    return count;
+	}
+
+	// creating a method to search a book
+	public int findBook(int bookId) {
+	    for (int i = 0; i < count; i++) {
+	        if (books[i].getBookId() == bookId) {
+	            return i;
+	        }
+	    }
+	    return -1;
+	}
+   // creating a method to get a book
+	public Book getBook(int index) {
+	    if (index >= 0 && index <= count) {
+	        return books[index];
+	    }
+	    return null;
+	}
+
+
+	// creating a method to add a book
+	public boolean addBook(Book b) {
+	    if (count < books.length && findBook(b.getBookId()) == -1) {
+	        books[count] = b;
+	        count++;
+	        return true;
+	    }
+	    return false;
+
+	}
+
+   // creating a book to remove book
+	public boolean removeBook(Book b){
+	    int index = findBook(b.getBookId());
+	    if (index != -1) {
+	        for (int i = index; i < (count - 1); i++) {
+	            books[i] = books[i+1];
+	        }
+	        count--;
+	        return true;
+	    }
+	    return false;
+	}
+
+   // creating a method to print all the books
+	public void getAllBook() {
+	    System.out.println("All the book in the system are: " + "\r\n");
+
+	    for(int i = 0; i < count; i++){
+	        System.out.println(books[i]);
+	        System.out.println("\r\n");
+	    }
+
+	}
+
+	// creating a method to display the menu
+	public void displayMainMenu(){
+	    System.out.println("******************************");
+	    System.out.println("   Library Menu   ");
+	    System.out.println("1: Add a book.");
+	    System.out.println("2: Get a book information.");
+	    System.out.println("3: Delete the book.");
+	    System.out.println("4: Print all books.");
+	    System.out.println("******************************" + "\r\n");
+	}
+}

2.png

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+package Task3;
+
+import java.util.Scanner;
+// creating a class main to implement main method
+public class Main {
+	public static void main(String[]args){
+		try (Scanner sc = new Scanner(System.in)) {
+			System.out.println("Enter Employee Details");
+			System.out.println("=============================================");
+			System.out.println("Enter EmployeeId");
+			int empId = sc.nextInt();
+			System.out.println("Enter Employee Name");
+			String name = sc.next();
+			System.out.println("Enter Employee Salary");
+			float salary = sc.nextFloat();
+			Taxable tax = new Employee(empId, name, salary);
+			System.out.println(" ");
+			tax.calcTax();
+			System.out.println("=============================================");
+			System.out.println("Enter Employee Details");
+			System.out.println("=============================================");
+			System.out.println("Enter PID");
+			int pId = sc.nextInt();
+			System.out.println("Enter Price");
+			float price = sc.nextFloat();
+			System.out.println("Enter Quantity");
+			int quantity  =sc.nextInt();
+			Taxable gst = new Product(pId,price,quantity);
+			System.out.println(" ");
+			gst.calcTax();
+			System.out.println("=============================================");
+		}
+		}
+	}