complex numbers

import javax.swing.JOptionPane;

public class ComplexNumberDriver {
    final static String TITLE = "Imaginary Numbers";
    public static void main(String[] args) {
        //String TITLE = "Imaginary Numbers";

        double real;
        double imag;
        String realString;
        String imagString;

        while (true) {
            realString = JOptionPane.showInputDialog(null, "Enter Real Value of First Complex Number", TITLE, 1);
            imagString = JOptionPane.showInputDialog(null, "Enter Imaginary Value of First Complex Number", TITLE, 1);
            real = Double.parseDouble(realString);
            imag = Double.parseDouble(imagString);
            Complex c1 = new Complex(real, imag);

            realString = JOptionPane.showInputDialog(null, "Enter Real Value of Second Complex Number", TITLE, 1);
            imagString = JOptionPane.showInputDialog(null, "Enter Imaginary Value of Second Complex Number", TITLE, 1);
            real = Double.parseDouble(realString);
            imag = Double.parseDouble(imagString);
            Complex c2 = new Complex(real, imag);


            Complex plus = c1.add(c2);
            Complex minus = c1.subtract(c2);
            Complex times = c1.multiply(c2);
            Complex quot = c1.divide(c2);


            String outPut = "c1      = " + c1 +
            "\nc2      = " + c2 +
            "\nc1 + c2 = " + plus +
            "\nc1 - c2 = " + minus +
            "\nc1 * c2 = " + times +
            "\nc1 / c2 = " + quot +
            "\n-c1     = " + c1.negate() +
            "\n-c2     = " + c2.negate() +
            "\nConj c1 = " + c1.conjugate() +
            "\nConj c2 = " + c2.conjugate() +
            "\n|c1|    = " + c1.abs() +
            "\n|c2|    = " + c2.abs() +
            "\nDist    = " + c1.distance(c2) +
            "\n==?     = " + c1.equals(c2) +
            "\n>?      = " + c1.greaterThan(c2) +
            "\n<?      = " + c1.lessThan(c2);
            JOptionPane.showMessageDialog(null, outPut, TITLE, 1);


            int confirm = JOptionPane.showConfirmDialog(null, "Do this again?", TITLE, 1);
            if (!(confirm == JOptionPane.OK_OPTION))
                break;
        }
        JOptionPane.showMessageDialog(null, "Thank you for using " + TITLE, TITLE, 1);

    }

}