E2_Savingaccount

class SavingsAccount {
    private static double annualInterestRate;
    private double savingsBalance;

    public SavingsAccount(double savingsBalance) {
        this.savingsBalance = savingsBalance;
    }

    public void calculateMonthlyInterest() {
        double monthlyInterest = (savingsBalance * annualInterestRate) / 12;
        savingsBalance += monthlyInterest;
    }

    public static void modifyInterestRate(double newAnnualInterestRate) {
        annualInterestRate = newAnnualInterestRate;
    }

    public double getSavingsBalance() {
        return savingsBalance;
    }
}

public class SavingsAccountTest {
    public static void main(String[] args) {
        SavingsAccount.modifyInterestRate(0.04); // Set annualInterestRate to 4%

        SavingsAccount saver1 = new SavingsAccount(2000.0);
        SavingsAccount saver2 = new SavingsAccount(3000.0);

        // Calculate and print the new balances for both savers
        saver1.calculateMonthlyInterest();
        saver2.calculateMonthlyInterest();

        System.out.println("Month 1 - Saver 1: " + saver1.getSavingsBalance());
        System.out.println("Month 1 - Saver 2: " + saver2.getSavingsBalance());

        SavingsAccount.modifyInterestRate(0.05); // Set annualInterestRate to 5%

        // Calculate and print the new balances for both savers in the next month
        saver1.calculateMonthlyInterest();
        saver2.calculateMonthlyInterest();

        System.out.println("Month 2 - Saver 1: " + saver1.getSavingsBalance());
        System.out.println("Month 2 - Saver 2: " + saver2.getSavingsBalance());
    }
}