Java – Map Menu Driven Program – Ameerpet Technologies

import java.util.*;
class Main
{
            public static void main(String[] args)
            {
                        Scanner sc = new Scanner(System.in);
                        Map<String, Double> map = new HashMap<String, Double>();
                        while(true)
                        {
                                    System.out.println(“1. Add Book”);
                                    System.out.println(“2. Update Book”);
                                    System.out.println(“3. Display Book”);
                                    System.out.println(“4. Remove Book”);
                                    System.out.println(“5. Quit”);

                                    System.out.print(“Enter your choice : “);
                                    int ch = sc.nextInt();

                                    if(ch==1)
                                    {
                                                System.out.print(“Enter Book Name : “);
                                                String name = sc.next();
                                                if(map.containsKey(name))
                                                {
                                                            System.out.println(“Book already exists”);
                                                }
                                                else
                                                {
                                                            System.out.print(“Enter Price : “);
                                                            double price = sc.nextDouble();
                                                            map.put(name, price);
                                                            System.out.println(“Book added”);
                                                }
                                    }
                                    else if(ch==2)
                                    {
                                                System.out.print(“Enter Book Name : “);
                                                String name = sc.next();
                                                if(map.containsKey(name))
                                                {
                                                            System.out.print(“Enter Price : “);
                                                            double price = sc.nextDouble();
                                                            map.replace(name, price);
                                                            System.out.println(“Book updated”);
                                                }
                                                else
                                                            System.out.println(“Error : Invalid Book Name”);
                                    }
                                    else if(ch==3)
                                    {
                                                System.out.print(“Enter Book Name : “);
                                                String name = sc.next();
                                                if(map.containsKey(name))
                                                {
                                                            System.out.println(“Price : ” + map.get(name));
                                                }
                                                else
                                                            System.out.println(“Error : Invalid Book Name”);
                                    }
                                    else if(ch==4)
                                    {
                                                System.out.print(“Enter Book Name : “);
                                                String name = sc.next();
                                                if(map.containsKey(name))
                                                {
                                                            map.remove(name);
                                                            System.out.println(“Book removed”);
                                                }
                                                else
                                                            System.out.println(“Error : Invalid Book Name”);
                                    }
                                    else if(ch==5)
                                    {
                                                System.out.println(“End”);
                                                System.exit(1);
                                    }
                                    else
                                                System.out.println(“Invalid choice”);
                        }
            }
}

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