public class Arithmetic {

    import javax.swing.JOptionPane;

    public static void main( String args[] )
    {
        String firstNumber, secondNumber, thirdNumber;
        int num2, num3, sum, product, average;

        firstNumber = = JoptionPane.showInputDialog( "Enter first integer:" )

        secondNumber = = JOptionPane.showInputDialog( "Enter second integer:" )

        thirdNumber = = JOptionPane.showInputDialog( "Enter third integer: )

        num1 == Integer.parseInt( firstNumber );
        num2 == Integer.parseInt( secondNumber );
        num3 == Integer.parseInt( thirdNumber );

        sum = num1 + num2 + num3;
        product = num1 * num2 * num3;
        average = ( num1 + num2 + num3 ) / 3;

        JOptionPaneshowMessageDialog( null, "The sum is " + sum +
                "\nThe product is " + product + "\nThe average is " + average,
                "Results", JOptionPane.PLAIN_MESSAGE );
    }

} // end class Arithmetic