Mortgage Calculator with source code in java

//Mortgage.java
public class Mortgage {
 
 private double loanAmount;
 private int loanTerm ;
 private double interest ;
 
 

 
 
 public Mortgage(double loanAmount, int loanTerm, double interest){
  this.loanAmount = loanAmount;
  this.loanTerm = loanTerm;
  this.interest = interest;
  
  
  
 }
 
 public void setLoanAmount(double loanAmount){
  this.loanAmount = loanAmount;
 }
 
 public double getLoanAmount(){
  return loanAmount;
 }
 
 
 
 public void setLoanTerm(int loanTerm){
  this.loanTerm = loanTerm;
 }
 
 public int getLoanTerm(){
   return loanTerm;
 }
 
 
 public void setInterest(double interest){
  this.interest = interest;
 }
 public double getInterst(){
  
  return interest;
 }
 
 
 
 
 
 public double getDailyRepayments(){ 
  double a = getInterst()*365/365+12; 
  double days = getLoanTerm()*365/365+12; 
  return a*getLoanAmount()/(1-1/Math.pow(1+a,days)); 
  }
 
 
 
  public double balanceAfterDays(int d){ 
  double a = getInterst()/365; 
  double days = getLoanTerm()*365; 
  return getLoanAmount()*(Math.pow(1+a,days)-Math.pow(1+a,d))/(Math.pow(1+a,days)-1); 
  } 
  
  
  public String getFortnightRepayment(){
   double a = getInterst()/100;
   return String.format("%.2f", (getLoanAmount() * a/26) / (1 - 1 / Math.pow(1 + a/26, 260)));
  }

  public String getBalance(int y){
   double a = getInterst()/100;
   return String.format("%.2f",getLoanAmount()*(Math.pow(1+a/26, y*26))-505.52*((Math.pow(1+a/26, 78)-1)/(a/26)) );
   
  }
 
}
//Mortgage.java Ends



//MortgageCalculator.java

import java.awt.Component;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JSeparator;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.SwingConstants;


public class MortgageCalculator extends JFrame implements ActionListener {

 
 private JLabel lblLoanAmount;
 private JLabel lblLoanTerm;
 private JLabel lblInterest;
 private JLabel lblAud;
 private JLabel lblyears;
 private JLabel lblpercent;
 private JLabel lblfortnightlyRepayments;
 private JLabel lblyear;
 private JLabel lblbalanceAtTheEndOfYear;
 
 private JTextField tfLoanAmount;
 private JTextField tfLoanTerm;
 private JTextField tfLoanInterest;
 private JTextField tffortnightlyRepayments;

 private JButton btnCalculate;
 private JTextArea taOutputArea;
 private JScrollPane scrollArea;
 private JSeparator separator;
 
 JPanel mainPanel;
 
 public MortgageCalculator(){
  super("Mortgage Calculator");
  lblLoanAmount= new JLabel("Loan Amount"); 
  lblLoanTerm= new JLabel("Loan Term"); 
  lblInterest= new JLabel("Interest"); 
  lblAud= new JLabel("AUD"); 
  lblyears= new JLabel("Years"); 
  lblpercent= new JLabel("%"); 
  lblfortnightlyRepayments= new JLabel("Fortnightly Repayments"); 
  lblyear= new JLabel("Year"); 
  lblbalanceAtTheEndOfYear= new JLabel("Balance at the end of the year"); 
  tffortnightlyRepayments = new JTextField();
  tffortnightlyRepayments.setEditable(false);
  
  tfLoanAmount = new JTextField();
  tfLoanTerm   = new JTextField();
  tfLoanInterest= new JTextField(); 
  
  btnCalculate = new JButton("Calculate");
  taOutputArea = new JTextArea();
  scrollArea = new JScrollPane(taOutputArea);
  
  separator = new JSeparator(SwingConstants.HORIZONTAL);
  
  mainPanel = new JPanel();
  mainPanel.setLayout(null);
  
  setComponents(mainPanel, lblLoanAmount, 50, 50, 100, 30);
  setComponents(mainPanel, lblLoanTerm, 50, 90, 100, 30);
  setComponents(mainPanel, lblInterest, 50, 130, 100, 30);
  
  setComponents(mainPanel, tfLoanAmount, 300,  50, 100, 30);
  setComponents(mainPanel, tfLoanTerm, 300, 90, 100, 30);
  setComponents(mainPanel, tfLoanInterest, 300, 130, 50, 30);
  
  setComponents(mainPanel, lblAud, 430,  50, 100, 30);
  setComponents(mainPanel, lblyear, 430, 90, 100, 30);
  setComponents(mainPanel, lblpercent, 350, 130, 100, 30);
  
  setComponents(mainPanel, btnCalculate, 50, 170, 100, 30);
  
  setComponents(mainPanel, separator, 20, 220, 440, 30);
  
  setComponents(mainPanel, lblfortnightlyRepayments, 50, 240, 160, 30);
  setComponents(mainPanel, tffortnightlyRepayments, 350, 240, 70, 25);
  
  setComponents(mainPanel, lblyears, 50, 280, 70, 30);
  setComponents(mainPanel, lblbalanceAtTheEndOfYear, 250, 280, 180, 30);
  
  setComponents(mainPanel, scrollArea, 50, 310, 380, 220);
  
  setSize(500, 580);
  setLocationRelativeTo(null);
  setResizable(false);
  setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  setVisible(true);
  
  btnCalculate.addActionListener(this);
  
 }
 
 public void actionPerformed(ActionEvent e) {
  
  String strloanAmount = tfLoanAmount.getText();
  String strloanTerm = tfLoanTerm.getText();
  String strloanInterest = tfLoanInterest.getText();
  
  Object source = e.getSource();
  if(source.equals(btnCalculate)){
    try {

     
     
     double douloanAmont = Double.parseDouble(strloanAmount);
     int intloanTerm = Integer.parseInt(strloanTerm);
     double douloanInterest = Double.parseDouble(strloanInterest);
     
     Mortgage m = new Mortgage(douloanAmont,intloanTerm,douloanInterest);
     
     
     
     
    
     String fortnightlyrepayment = m.getFortnightRepayment();
     
     tffortnightlyRepayments.setText(""+fortnightlyrepayment);
     
     
     taOutputArea.setText(null);
     for (int i = 1; i<=intloanTerm; i++){
      String a = m.getBalance(i);
      taOutputArea.append(i+"\t\t\t"+""+a+"\n");
     }
     
     
     
         
       } catch (NumberFormatException e1) {
        
         JOptionPane.showMessageDialog(null, "Please Fill all fields with integer values", "Error", JOptionPane.ERROR_MESSAGE);
         tfLoanAmount.setText(null);
         tfLoanTerm.setText(null);
         tfLoanInterest.setText(null);
       }
  }
  
 }
 public void setComponents(Container contentpane,Component c,int x, int y, int width, int height){
  
  c.setBounds(x,y,width,height);
  contentpane.add(c);
  
  this.add(contentpane);
 }
 
 public static void main(String[] args) {
  
  new MortgageCalculator();
 }
}
//MortgageCalculator.java ends

Screen Shot

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