ExpenseTracker.java

import java.util.*;

class Expense {
    String category;
    double amount;

    Expense(String category, double amount) {
        this.category = category;
        this.amount = amount;
    }
}

public class ExpenseTracker {
    static ArrayList<Expense> expenses = new ArrayList<>();
    static Scanner sc = new Scanner(System.in);

    public static void main(String[] args) {
        while (true) {
            System.out.println("\n1.Add Expense  2.View Expenses  3.Total  4.Exit");
            int choice = sc.nextInt();

            switch (choice) {
                case 1 -> addExpense();
                case 2 -> viewExpenses();
                case 3 -> totalExpense();
                case 4 -> System.exit(0);
                default -> System.out.println("Invalid choice");
            }
        }
    }

    static void addExpense() {
        System.out.print("Category: ");
        String category = sc.next();
        System.out.print("Amount: ");
        double amount = sc.nextDouble();

        expenses.add(new Expense(category, amount));
        System.out.println("Expense Added");
    }

    static void viewExpenses() {
        for (Expense e : expenses) {
            System.out.println(e.category + " : ₹" + e.amount);
        }
    }

    static void totalExpense() {
        double total = 0;
        for (Expense e : expenses) {
            total += e.amount;
        }
        System.out.println("Total Expense: ₹" + total);
    }
}