<code java>
package nslookup;

import java.io.Serializable;
import java.net.InetAddress;

public class QueryAnswer implements Serializable {

        InetAddress ia = null; 
        String hostName = null; 
        boolean valid = false;
        
        public QueryAnswer(String h, InetAddress i) {
                ia = i; hostName = h;
                valid = true;
        }
        
        public QueryAnswer() {
                valid = false; 
        }

        public String getHostName() { 
                if(valid) 
                        return hostName; 
                else 
                        return null; }
        public InetAddress getInetAddress() { 
                if(valid)
                        return ia; 
                else 
                        return null; }
        
        public String toString() { 
                if(valid) return hostName+" has address "+ia.toString(); else return "Not valid";
        }
        
}
</code>