DNSRecord(String name,DNSRecordType type,DNSRecordClass recordClass,boolean unique,int ttl){
  super(name,type,recordClass,unique);
  this._ttl=ttl;
  this._created=System.currentTimeMillis();
}

DNSRecord ( String name , DNSRecordType type , DNSRecordClass recordClass , boolean unique , int ttl ) { super ( name , type , recordClass , unique ) ; this . _ttl = ttl ; this . _created = System . currentTimeMillis ( ) ; }
create a dnsrecord with a name , type , class , and ttl .
