Selenium : Validate voters age

Program to check the age of user

import javax.swing.JOptionPane;
public class Vote_eligible {
 public static void main(String[] args)
 {
  int iAge=Integer.parseInt(JOptionPane.showInputDialog("enter age"));
  if (iAge>= 18)
  {
   JOptionPane.showMessageDialog(null, "Voter is above or equal to 18 years ,Elibible to vote");
  }
  else
  {
   JOptionPane.showMessageDialog(null, "Voter not eligible to vote");
  }   
 }
}