import java.util.*; 
public class LoanAccount{

// A static variable to store the annual Interest rate 
static double annualInterestRate; 
// A private variable of type double to store the principle amount 
private double principle;

// Constructor of LoanAccount Class 
LoanAccount(double p){
principle = p; 
}

// The calculateMonthlyPayment() method computes the monthly payment
// Provided the number of payments to be made for a given principle amount 
public double calculateMonthlyPayment(int numberOfPayments){

// The monthly interest rate is computed as annualInterestRate/12 
double monthlyInterestRate = annualInterestRate/12;

// Here computing the value of monthly payments using the below formula 
double monthlyPayment = principle * ((monthlyInterestRate)/(1 - Math.pow(1 + monthlyInterestRate, -1*numberOfPayments)));

// It returns the computed value of monthly payment 
return monthlyPayment;
}

// Function to set the value of the annualInterestRate to a new rate 
static void setAnnualInterestRate(double newRate){
annualInterestRate = newRate;
}

// Main Method 
public static void main(String[] args){

// Created two instances of LoanAccount class with
// Principle amount of 5000 for loan1 and 31000 for loan2 LoanAccount loan1 = new LoanAccount(5000); 
LoanAccount loan2 = new LoanAccount(31000);

// Test 1
// Setting annualInterestRate to 1% or 0.01 setAnnualInterestRate(0.01);

// Displaying the output in desired format
System.out.println("Monthly payments for loan1 of $5000.00 and loan2 of $31000.00 for 3, 5 and 6 year loans at 1% interest."); System.out.println("Loan\t3 years\t5 years\t6 years");

// Displaying the monthly payments of loan1 for the tenure for 36, 60 and 72 months 
System.out.print("Loan1\t"); 
System.out.print(String.format("%.2f\t", loan1.calculateMonthlyPayment(36)));
System.out.print(String.format("%.2f\t", loan1.calculateMonthlyPayment(60))); 
System.out.print(String.format("%.2f", loan1.calculateMonthlyPayment(72)));

// Displaying the monthly payments of loan2 for the tenure for 36, 60 and 72 months 
System.out.print("\nLoan2\t"); 
System.out.print(String.format("%.2f\t", loan2.calculateMonthlyPayment(36))); 
System.out.print(String.format("%.2f\t", loan2.calculateMonthlyPayment(60))); 
System.out.print(String.format("%.2f", loan2.calculateMonthlyPayment(72)));

// Test 2
// Setting annualInterestRate to 5% or 0.05
setAnnualInterestRate(0.05);

// Displaying the output in desired format.
System.out.println("\n\nMonthly payments for loan1 of $5000.00 and loan2 of $31000.00 for 3, 5 and 6 years loan at 1% interest."); 
System.out.println("Loan\t3 years\t5 years\t6 years");

// Displaying monthly payments for loan1 for the tenure for 36, 60 and 72 months
System.out.print("Loan1\t"); 
System.out.print(String.format("%.2f\t", loan1.calculateMonthlyPayment(36)));
System.out.print(String.format("%.2f\t", loan1.calculateMonthlyPayment(60))); 
System.out.print(String.format("%.2f", loan1.calculateMonthlyPayment(72)));
System.out.print("\nLoan2\t");

// Displaying monthly payments for loan2 for the tenure for 36, 60 and 72 months 
System.out.print(String.format("%.2f\t", loan2.calculateMonthlyPayment(36)));
System.out.print(String.format("%.2f\t", loan2.calculateMonthlyPayment(60))); 
System.out.print(String.format("%.2f", loan2.calculateMonthlyPayment(72)));
  } 
}