// Fig. 5.6: Interest.java
// Calculating compound interest.
import java.text.NumberFormat;  // class for numeric formatting
import java.util.Locale;  // class for country-specific information

import javax.swing.JOptionPane;
import javax.swing.JTextArea;

public class Interest {

   public static void main( String args[] )
   {
      double amount;       // amount on deposit at end of each year
      double principal = 1000.0;  // initial amount before interest
      double rate = 0.05;         // interest rate

      // create NumberFormat for currency in US dollar format
      NumberFormat moneyFormat = 
         NumberFormat.getCurrencyInstance( Locale.US );

      // create JTextArea to display output
      JTextArea outputTextArea = new JTextArea();

      // set first line of text in outputTextArea
      outputTextArea.setText( "Year\tAmount on deposit\n" );

      // calculate amount on deposit for each of ten years
      for ( int year = 1; year <= 10; year++ ) {

         // calculate new amount for specified year
         amount = principal * Math.pow( 1.0 + rate, year );

         // append one line of text to outputTextArea
         outputTextArea.append( year + "\t" +
            moneyFormat.format( amount ) + "\n" );

      } // end for

      // display results
      JOptionPane.showMessageDialog( null, outputTextArea,
         "Compound Interest", JOptionPane.INFORMATION_MESSAGE );

      System.exit( 0 );  // terminate the application

   } // end main

} // end class Interest

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