/*
   filename:         maturity.java
   description:      evaluates the amount on a certificate of deposit of maturity
   author:           Kalin Ringkvist, k.rainquist@comcast.net
   version:          1.00 2004-02-10
*/

//import  Java classes
import javax.swing.*;
import java.awt.*;

import java.awt.event.*;//to detect the click on the button
import java.text.*;     //to format our output


public class maturity extends JFrame
{
    //create instance variables
      private JLabel lblAmount = new JLabel("Amount deposited:");
      private JLabel lblYears = new JLabel("Number of Years:");
      private JLabel lblInterest = new JLabel("Interest rate:");
      private JTextField txbAmount = new JTextField("");
      private JTextField txbYears = new JTextField("");
      private JTextField txbInterest = new JTextField("");
      private JTextField txbResult = new JTextField("");
      private JButton butCalc = new JButton("Calculate");

   private CalculateButtonHandler calcHandler;
    public maturity()
      {
         //get reference to JFrame.
         Container frame = getContentPane();

         //create and apply layout to the frame
         frame.setLayout(new GridLayout(4,2));

         //set result box as uneditable
         txbResult.setEditable(false);

         //set the default operation to exit when the user closes the application
         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

         //set the title of the frame
         setTitle("Calculate amount of a certificate of deposit on maturity.");

         //show the frame
         show();

         //put the objects on the form & align text
         frame.add(lblAmount);
         lblAmount.setHorizontalAlignment(JTextField.CENTER);
         frame.add(txbAmount);
         frame.add(lblYears);
         lblYears.setHorizontalAlignment(JTextField.CENTER);
         frame.add(txbYears);
         frame.add(lblInterest);
         lblInterest.setHorizontalAlignment(JTextField.CENTER);
         frame.add(txbInterest);
         frame.add(butCalc);
         frame.add(txbResult);

         //add action listener to butCalc to detect the click
         calcHandler = new CalculateButtonHandler();
         butCalc.addActionListener(calcHandler);
      }

   public static void main(String[] args)
   {

      maturity m = new maturity(); //instantiate class
      m.pack(); //pack the frame around the objects

   }


   //private class handles the button click event
   private class CalculateButtonHandler implements ActionListener
   {
      public void actionPerformed(ActionEvent event)
      {
         //get the user input
         double amount = Double.parseDouble(txbAmount.getText());
         double years = Double.parseDouble(txbYears.getText());
         double rate = Double.parseDouble(txbInterest.getText());

         //calculate total amount and put into result
         double result = amount * (Math.pow(1 + rate / 100, years));

       //format and display the result
         NumberFormat formatter = NumberFormat.getCurrencyInstance();
         txbResult.setText(formatter.format(result));
      }
   }


}