StockTradingPlatform.java

import java.util.Scanner;

class Stock {
    String name;
    double price;

    Stock(String name, double price) {
        this.name = name;
        this.price = price;
    }
}

public class StockTradingPlatform {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        Stock[] stocks = {
            new Stock("TCS", 3500),
            new Stock("INFOSYS", 1800),
            new Stock("RELIANCE", 2900)
        };

        System.out.println("========== STOCK MARKET ==========");

        for (int i = 0; i < stocks.length; i++) {
            System.out.println((i + 1) + ". " +
                    stocks[i].name + " - Rs." + stocks[i].price);
        }

        System.out.print("\nSelect a stock (1-" + stocks.length + "): ");
        int choice = sc.nextInt();

        if (choice < 1 || choice > stocks.length) {
            System.out.println("Invalid stock selection.");
            sc.close();
            return;
        }

        Stock selected = stocks[choice - 1];

        System.out.print("Enter quantity to buy: ");
        int quantity = sc.nextInt();

        if (quantity <= 0) {
            System.out.println("Quantity must be greater than 0.");
            sc.close();
            return;
        }

        double total = quantity * selected.price;

        System.out.println("\n========== PORTFOLIO ==========");
        System.out.println("Stock      : " + selected.name);
        System.out.println("Price      : Rs." + selected.price);
        System.out.println("Quantity   : " + quantity);
        System.out.println("Investment : Rs." + total);
        System.out.println("===============================");

        sc.close();
    }
}