Variables - Parameters

I can not erase the data when I click on a button, I explain, it perfectly opens the string "data", and also the "J1" and "J2", when I open the fragment for the first time, it shows me the url + data, correct, but when I press a button, it does not erase the data that it is showing me, and it adds to the end the data of "J1", how do I do it so that the previous ones are deleted and I show the ones of the button?

public class FragJuv01 extends Fragment {

    Button j1, j2;

    String url = "https://rafelcf.000webhostapp.com//2018/";
    String dato = "jornada_actual_juvenil.php";
    String J1 = "juvenil/jornadas/j_01.php";
    String J2 = "juvenil/jornadas/j_03.php";

    private List<ModelEstadisticas> listJornadas;

    //Creating Views
    private RecyclerView recyclerView;
    private RecyclerView.LayoutManager layoutManager;
    private RecyclerView.Adapter adapter;

    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {

        View view = inflater.inflate(R.layout.jornadas_list, null);

        j1 = (Button)view.findViewById(R.id.j1);
        j1.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                dato = J1;
                getData();
            }
        });

        j2 = (Button)view.findViewById(R.id.j2);
        j2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                dato = J2;
                getData();
            }
        });

        //Initializing Views
        recyclerView = (RecyclerView) view.findViewById(R.id.recyclerView);
        recyclerView.setHasFixedSize(true);
        //layoutManager = new LinearLayoutManager(getActivity());
        RecyclerView.LayoutManager layoutManager = new GridLayoutManager(getActivity(), 1);
        recyclerView.setLayoutManager(layoutManager);

        final TextView miTexto = (TextView) view.findViewById(R.id.mi_texto);
        miTexto.setText(R.string.list_juveniles);
        //miTexto.setTextColor(color.RED);

        //Initializing our jornadas list
        listJornadas = new ArrayList<>();

        RequestQueue queue;

        //Laamando al metodo get data
        getData();

        recyclerView.setAdapter(adapter);
        recyclerView.addItemDecoration(new DecoracionLineaDivisoria(getActivity()));
        return view;
    }

    //This method will get data from the web api
    private void getData() {
        //Showing a progress dialog
        final ProgressDialog loading = ProgressDialog.show(getActivity(), "Cargando datos", "Por favor espere...", false, false);

        //Creating a json array request
        JsonArrayRequest jsonArrayRequest = new JsonArrayRequest(url+dato,
                new Response.Listener<JSONArray>() {
                    @Override
                    public void onResponse(JSONArray response) {
                        //Dismissing progress dialog
                        loading.dismiss();

                        //calling method to parse json array
                        parseData(response);
                    }
                },
                new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {
                    }
                });

        //Creating request queue
        RequestQueue requestQueue = Volley.newRequestQueue(getActivity());

        //Adding request to the queue
        requestQueue.add(jsonArrayRequest);
    }

    //This method will parse json data
    private void parseData(JSONArray array) {
        for (int i = 0; i < array.length(); i++) {
            ModelEstadisticas jornadas = new ModelEstadisticas();
            JSONObject json = null;
            try {
                json = array.getJSONObject(i);

                jornadas.setFecha(json.getString("fecha"));
                jornadas.setHora(json.getString("hora"));

                jornadas.setE_local(json.getString("nomLocal"));
                jornadas.setE_visi(json.getString("nomVisitante"));
                jornadas.setR_local(json.getString("resulLocal"));
                jornadas.setEstado(json.getString("estadoPartido"));
                jornadas.setR_visi(json.getString("resulVisitante"));

                jornadas.setEsc_local("http://ffcv.es/ncompeticiones/" + (json.getString("escudoLocal")));
                jornadas.setEsc_visi("http://ffcv.es/ncompeticiones/" + (json.getString("escudoVisitante")));


            } catch (JSONException e) {
                e.printStackTrace();
            }
            listJornadas.add(jornadas);
        }

        //Finally initializing our adapter
        adapter = new JornadasAdapter(listJornadas, getActivity());

        //Adding adapter to recyclerview
        recyclerView.setAdapter(adapter);
    }
}

The adapter if necessary

public class JornadasAdapter extends RecyclerView.Adapter<JornadasAdapter.ViewHolder> {

private ImageLoader imageLoader;
private Context context;

List<ModelEstadisticas> estadisticas;

public JornadasAdapter(List<ModelEstadisticas> estadisticas, Context context) {
    super();
    this.estadisticas = estadisticas;
    this.context = context;
}

@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.jornadas_row, parent, false);
    ViewHolder viewHolder = new ViewHolder(v);
    return viewHolder;
}

public void onBindViewHolder(ViewHolder holder, final int position) {
    holder.root.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

            //Toast.makeText(context, "PROXIMAMENTE",
            //Toast.LENGTH_LONG).show();

            Toast.makeText(context, estadisticas.get(position).getE_local(), Toast.LENGTH_SHORT).show();

            /*Intent intent= new Intent(context, DetailPartidos.class);

            //intent.putExtra("Jornada", estadisticas.get(position).getJornada());
            intent.putExtra("Fecha", estadisticas.get(position).getFecha());
            intent.putExtra("E_local", estadisticas.get(position).getE_local());
            intent.putExtra("E_visi", estadisticas.get(position).getE_visi());
            intent.putExtra("R_Local", estadisticas.get(position).getR_local()+estadisticas.get(position).getR_visi());



            intent.putExtra("Esc_Local", estadisticas.get(position).getEsc_local());
            intent.putExtra("Esc_Visi", estadisticas.get(position).getEsc_visi());

            context.startActivity(intent);*/


            ModelEstadisticas modelEstadisticas1 = estadisticas.get(getAdapterPosition());
        }

        private int getAdapterPosition() {
            return 0;
        }
    });
    ModelEstadisticas jornadas = estadisticas.get(position);
    imageLoader = DecoracionLineaDivisoria.CustomVolleyRequest.getInstance(context).getImageLoader();
    imageLoader.get(jornadas.getEsc_local(), ImageLoader.getImageListener(holder.escudo_local, R.mipmap.ic_launcher, android.R.drawable.ic_dialog_alert));
    imageLoader.get(jornadas.getEsc_visi(), ImageLoader.getImageListener(holder.escudo_visi, R.mipmap.ic_launcher, android.R.drawable.ic_dialog_alert));

    holder.textV_Fecha.setText(jornadas.getFecha());
    //holder.textV_Hora.setText(" a las " + jornadas.getHora());
    holder.textV_Hora.setText(jornadas.getHora());
    holder.textV_Equipo_Local.setText(jornadas.getE_local());
    holder.textV_Equipo_Visitante.setText(jornadas.getE_visi());
    holder.textV_Res_Local.setText(jornadas.getR_local());
    holder.textV_Estado.setText("  -  " + jornadas.getEstado() + "  -  ");
    holder.textV_Res_Visitante.setText(jornadas.getR_visi());
    holder.textV_Arbitro.setText(jornadas.getArbitro());

    //holder.escudo_local.setImageUrl(jornadas.getEsc_local(), imageLoader);
    //holder.escudo_visi.setImageUrl(jornadas.getEsc_visi(), imageLoader);

    /*Glide.with(context)
            .load(jornadas.getEsc_local())
            //.placeholder(R.drawable.friends_red)
            //.transform(new CircleTransform(context))
            .into(holder.escudo_local);

    Glide.with(context)
            .load(jornadas.getEsc_visi())
            //.placeholder(R.drawable.friends_red)
            //.transform(new CircleTransform(context))
            .into(holder.escudo_visi);*/
}

@Override
public int getItemCount() {
    return estadisticas.size();
}

class ViewHolder extends RecyclerView.ViewHolder {

    public TextView textV_Fecha;
    public TextView textV_Hora;
    public TextView textV_Equipo_Local;
    public TextView textV_Equipo_Visitante;
    public TextView textV_Res_Local;
    //public TextView textV_Res_Visi;
    public TextView textV_Estado;
    public TextView textV_Res_Visitante;
    public TextView textV_Arbitro;

    public ImageView escudo_local;
    public ImageView escudo_visi;


    public View root;

    public ViewHolder(View itemView) {
        super(itemView);
        root = itemView;


        textV_Fecha = (TextView) itemView.findViewById(R.id.tv_Fecha);
        textV_Hora = (TextView) itemView.findViewById(R.id.tv_Hora);
        textV_Equipo_Local = (TextView) itemView.findViewById(R.id.tv_Equipo_Local);
        textV_Equipo_Visitante = (TextView) itemView.findViewById(R.id.tv_Equipo_Visitante);

        textV_Res_Local = (TextView) itemView.findViewById(R.id.tv_Result_Local);
        textV_Estado = (TextView) itemView.findViewById(R.id.tv_Estado);
        textV_Res_Visitante = (TextView) itemView.findViewById(R.id.tv_Result_Visitante);
        textV_Arbitro = (TextView) itemView.findViewById(R.id.tv_Arbitro);

        escudo_local = (ImageView) itemView.findViewById(R.id.tv_esc_local);
        escudo_visi = (ImageView) itemView.findViewById(R.id.tv_esc_visi);
    }
}

}