private boolean equalsNull(String c1,String c2){
  if (c1 == null)   c1="";
  if (c2 == null)   c2="";
  return c1.equalsIgnoreCase(c2);
}

private boolean equalsNull ( String c1 , String c2 ) { if ( c1 == null ) c1 = "" ; if ( c2 == null ) c2 = "" ; return c1 . equalsIgnoreCase ( c2 ) ; }
equals if " " or null
