A simple addition of two numbers using Java that using swing JOptionPane to accept and display the sum of the two numbers.

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Program Listing

// Addition,java
// Addition program that uses JOptionPane for input and output.
// Jake Rodriguez Pomperada, MAED-IT, MIT
// www.jakerpomperada.blogspot.com  and www.jakerpomperada.com
// jakerpomperada@gmail.com
// Bacolod City, Negros Occidental Philippines

import javax.swing.JOptionPane; 

public class Addition 
   public static void main( String args[] )
      // obtain user input from JOptionPane input dialogs
      String x = 
         JOptionPane.showInputDialog( "Enter first integer" );
      String y =
          JOptionPane.showInputDialog( "Enter second integer" );

      // convert String inputs to int values for use in a calculation
      int a = Integer.parseInt(x); 
      int b = Integer.parseInt(y);

      // Perform addition of variables a and variable b
      int sum = a+b;

      // display result in a JOptionPane message dialog
      JOptionPane.showMessageDialog( null, "The sum of " + a + " and " + b + " is " + sum + ".", 
         "Sum of Two Numbers Using JOptionPane in Java", JOptionPane.INFORMATION_MESSAGE );
   } // end method main
} // end class Addition