Main.java

import java.util.ArrayList;
import java.util.Scanner;

class MusicItem {
    private String name;
    private String artist;
    private double price;
    private int stock;

    public MusicItem(String name, String artist, double price, int stock) {
        this.name = name;
        this.artist = artist;
        this.price = price;
        this.stock = stock;
    }

    public String getName() { return name; }
    public String getArtist() { return artist; }
    public double getPrice() { return price; }
    public int getStock() { return stock; }
    public void reduceStock(int qty) { this.stock -= qty; }

    public void display() {
        System.out.println("-----------------------------------");
        System.out.println("Name   : " + name);
        System.out.println("Artist : " + artist);
        System.out.println("Price  : $" + price);
        System.out.println("Stock  : " + stock);
        System.out.println("-----------------------------------");
    }
}

class MusicStore {
    private ArrayList<MusicItem> items = new ArrayList<>();

    public void addItem(MusicItem item) {
        items.add(item);
        System.out.println("Item added successfully!");
    }

    public void displayItems() {
        if (items.isEmpty()) { System.out.println("No items available."); return; }
        for (MusicItem item : items) item.display();
    }

    public MusicItem searchItem(String name) {
        for (MusicItem item : items) if (item.getName().equalsIgnoreCase(name)) return item;
        return null;
    }

    public void purchase(String name, int qty) {
        MusicItem item = searchItem(name);
        if (item == null) { System.out.println("Item not found!"); return; }
        if (item.getStock() < qty) { System.out.println("Not enough stock!"); return; }
        double total = qty * item.getPrice();
        item.reduceStock(qty);
        System.out.println("Purchase successful!");
        System.out.println("Total Amount: ₹" + total);
    }
}

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        MusicStore store = new MusicStore();

        while (true) {
            System.out.println("\n===== MUSIC STORE MENU =====");
            System.out.println("1. Add Music Item");
            System.out.println("2. Display All Items");
            System.out.println("3. Search Item");
            System.out.println("4. Purchase Item");
            System.out.println("5. Exit");
            System.out.print("Enter your choice: ");

            int choice;
            try {
                choice = Integer.parseInt(sc.nextLine().trim());
            } catch (NumberFormatException e) {
                System.out.println("Invalid input.");
                continue;
            }

            switch (choice) {
                case 1 -> {
                    System.out.print("Enter music name: ");
                    String name = sc.nextLine();
                    System.out.print("Enter artist: ");
                    String artist = sc.nextLine();
                    System.out.print("Enter price: ");
                    double price = Double.parseDouble(sc.nextLine());
                    System.out.print("Enter stock: ");
                    int stock = Integer.parseInt(sc.nextLine());
                    store.addItem(new MusicItem(name, artist, price, stock));
                }
                case 2 -> store.displayItems();
                case 3 -> {
                    System.out.print("Enter name to search: ");
                    String search = sc.nextLine();
                    MusicItem found = store.searchItem(search);
                    if (found != null) found.display();
                    else System.out.println("Item not found.");
                }
                case 4 -> {
                    System.out.print("Enter item name: ");
                    String purchaseName = sc.nextLine();
                    System.out.print("Enter quantity: ");
                    int qty = Integer.parseInt(sc.nextLine());
                    store.purchase(purchaseName, qty);
                }
                case 5 -> { System.out.println("Thank you!"); sc.close(); return; }
                default -> System.out.println("Invalid choice!");
            }
        }
    }
}