LoanCalculator.java

import java.util.*;
/**
* sets up the calculator
*/
public class LoanCalculator {

    public static void main(String[] args) {
    
         Scanner console=new Scanner(System.in);
   
     System.out.print("What is the annual percentage rate (APR)? ");
     
     double apr=console.nextDouble();
     
     System.out.print("What is the loan term in years? ");
     
     double loanTerm=console.nextDouble();
     
     System.out.print("What is the loan amount in whole dollars? ");
     
     double amount=console.nextDouble();
     
 double monthlyPayment= calculatePayment( apr,  loanTerm,  amount);
	 
	 System.out.printf("the monthly payment is : %.2f\n", monthlyPayment);
	    producePaymentSchedule(monthlyPayment, apr, loanTerm, amount);
		
	  
	 }
  /**
 * Calculates the monthly payment.
 * @return monthly payment
 */
    public static double calculatePayment(double apr, double loanTerm, double amount) {
    	
	
	double n = 12 * loanTerm;
	
	double i= apr/1200;

     double monthlyPayment=(amount * i * Math.pow(1+i, n))/(Math.pow(1+i, n)-1);

    
     return monthlyPayment;
	
    }
  /**
* Create Payment Schedule
* @param monthly payment, apr, loanTerm, and amount
*/
 public static void producePaymentSchedule(double monthlyPayment, double apr, double loanTerm, double amount) {
 
                   System.out.println("         Payment Schedule   ");
		   
	 System.out.printf("   num   Payment   Interest   Principal   Balance \n");
	 double Balance=amount;
	 System.out.printf("                                         $%8.2f\n\n", Balance);
	 
	       
	      for(int i=1; i<=(loanTerm*12); i++) {
		  double payment=monthlyPayment;
		  double interest= (apr/1200)*Balance;
		  double  principal=payment-interest;	  
		   Balance=Balance-principal;
		  System.out.printf("%4d   $%6.2f    $%6.2f    $%6.2f    $%8.2f\n", i, payment, interest, principal, Balance);
		  }
   }
}
		  
	   
	 
	 
	 
  


		 

		
    	
	  
		  
    
	
	   
	   
	 
  

	 

Saw this code on the LinusTechTips forum for the challenge of a useful program under 100 lines of code: you could really nail it if you indented more efficiently