package  test.swing;

 import  java.awt.*;

 public   class  HColor {
   public   static   void  main(String[] args) {
    Color c = Color.CYAN;
    String hex = toHex(c);
    System.out.println("#" + hex.toUpperCase());
  }

   private   static  String toHex(Color c) {
     if  (c ==  null ) {
       return  toHex(Color.BLACK);
    }

    String red = leadZero(Integer.toHexString(c.getRed()));
    String green = leadZero(Integer.toHexString(c.getGreen()));
    String blue = leadZero(Integer.toHexString(c.getBlue()));

     return  red + green + blue;
  }

   private   static  String leadZero(String s) {
     return  s.length() ==  1  ? "0" + s : s;
  }
}