Print cycle while in a TextArea that is in another Java class

I have this program that pings a specified host.

public class PingTool {

private String ip = "";
private int port;
private int times;
private String hostaddr = "";
String resultado;


public void setDireccion(String ip, int port, int times){
    this.ip = ip;
    this.port = port;
    this.times = times;
}

//Metodo que ejecuta el programa.
public void exec(){

    try { 
        hostaddr = InetAddress.getByName(ip).getHostAddress();.           
    } catch (UnknownHostException e) { 
        System.out.println("El host ingresado es incorrecto."); 
        System.exit(0); 
    }

    resultado = "Haciendo ping a "+ip+" ("+hostaddr+") "+times+" veces en el puerto "+port+"...\n";

    int total = 0;
    long totalping = 0;
    Socket s = null;

    while(total < times) {
        total++;
        long start = System.currentTimeMillis();

        try {
            SocketAddress sockaddr = new InetSocketAddress(hostaddr, port);
            s = new Socket();
            s.connect(sockaddr, 1000);
        } catch(SocketTimeoutException e) {
            resultado = "Respuesta desde ["+hostaddr+"]: Tiempo de espera agotado.";
            continue;
        } catch(UnknownHostException e) {
        } catch(IOException e) {
        }

        long end = System.currentTimeMillis();
        totalping += (end-start);
        long totaltime = (end-start);
        long avg = (long)(totalping/total);

        if(totaltime <= 0){
            totaltime++;
            resultado = "Respuesta desde "+hostaddr+" Tiempo: "+ "<" + totaltime + "ms" +" Average: "+avg;
        }else{
            resultado = "Respuesta desde "+hostaddr+" Tiempo: "+ totaltime + "ms" +" Average: "+avg;
        }
    }

    long avg = (long)(totalping/total);

    resultado = "\nResultado de ping para: " + hostaddr;
    resultado = "\nAverage request - " + avg;

}

}

And I have another class in which I have the graphical interface where the result is a textarea.

    PingTool pingTool = new PingTool();

    String ip = campoIP.getText();
    int port = Integer.parseInt(campoPort.getText());
    int times = Integer.parseInt(campoTimes.getText());

    pingTool.setDireccion(ip, port, times);
    pingTool.exec();
    resultadoPing.append(result + "\n");

What I can not do is print the result textarea every cycle turn, for example if I want to ping 10 times in the textarea should appear those 10 results. But the only thing I get is to print the last value that is assigned to the variable that contains the result.