Attribute sepallength = new Attribute("sepallength");
        Attribute sepalwidth = new Attribute("sepalwidth");
        Attribute petallength = new Attribute("petallength");
        Attribute petalwidth = new Attribute("petalwidth");
        ArrayList<String> cls_atr = new ArrayList<String>();
        cls_atr.add("Iris-setosa");
        cls_atr.add("Iris-versicolor");
        cls_atr.add("Iris-virginica");

        Attribute cls= new Attribute("class",cls_atr);
        ArrayList<Attribute> attributes = new ArrayList<Attribute>();
             attributes.add(sepallength);
             attributes.add(sepalwidth);
             attributes.add(petallength);
              attributes.add(petalwidth);
              attributes.add(cls);
             Instances dataset = new Instances("Test-dataset",attributes,5);

             double[] val = new double[data.numAttributes()];
             String text = null;
BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
System.out.println("Podaj sepallength: ");
text = stdin.readLine();
val[0] = Double.parseDouble(text);
              text = null;
System.out.println("Podaj sepalwidth: ");
text = stdin.readLine();
val[1] = Double.parseDouble(text);
             text = null;

System.out.println("Podaj petallength: ");
text = stdin.readLine();
val[2] = Double.parseDouble(text);
            text = null;

System.out.println("Podaj petalwidth: ");
text = stdin.readLine();
val[3] = Double.parseDouble(text);
             val[4]=data.attribute(4).indexOfValue("class");
             Instance inst = new DenseInstance(1.0,val);
             data.add(inst);

             double index = j48.classifyInstance(data.instance(data.numInstances()-1));
                    String className = data.attribute(data.numAttributes() - 1).value((int)index);
                    System.out.println(className);