Use Boxes Message with JOptionPane class

Common Constructors of JOptionPane class :

Common Methods of JOptionPane class :

Example :

import javax.swing.JOptionPane;

  public class NumbersDialog {

   public static void main(String[] args) {

     int creditDays = 30;

     JOptionPane.showMessageDialog(null, "" + creditDays);

     JOptionPane.showMessageDialog(null, "Every bill is due in " +       creditDays + " days");

     }

}

NumbersDialog class :

First dialog box created by NumbersDialog application :