// Fig. 2.9: Addition.java
// An addition program.

// Java extension packages
import javax.swing.JOptionPane;  // import class JOptionPane

public class Addition {

   // main method begins execution of Java application
   public static void main( String args[] )
   {
      String firstNumber;   // first string entered by user
      String secondNumber;  // second string entered by user
      int number1;          // first number to add
      int number2;          // second number to add
      int sum;              // sum of number1 and number2

      // read in first number from user as a string
      firstNumber =
         JOptionPane.showInputDialog( "Enter first integer" );

      // read in second number from user as a string
      secondNumber =
         JOptionPane.showInputDialog( "Enter second integer" );

      // convert numbers from type String to type int
      number1 = Integer.parseInt( firstNumber ); 
      number2 = Integer.parseInt( secondNumber );

      // add the numbers
      sum = number1 + number2;

      // display the results
      JOptionPane.showMessageDialog(
         null, "The sum is " + sum, "Results",
         JOptionPane.PLAIN_MESSAGE );

      System.exit( 0 );   // terminate application

   }  // end method main

}  // end class Addition

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 * (C) Copyright 2002 by Deitel & Associates, Inc. and Prentice Hall.     *
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