import javax.swing.JOptionPane;

/**
   This program demonstrates the use of option panes for 
   input and output.
*/
public class OptionPaneDemo 
{
   public static void main(String[] args)
   {
      String input = JOptionPane.showInputDialog("Enter price:");
      double price = Double.parseDouble(input);
      final double TAX_RATE = 8.5;
      price = price * (1 + TAX_RATE / 100);
      JOptionPane.showMessageDialog(null, "Price after tax: " + price);
   }
}