Weka create instance and training data using arff

Read training data from arff file:

public static Instances get_instances_from_arff() throws Exception {
	BufferedReader breader = null;
	breader = new BufferedReader( new FileReader(System.getProperty("user.dir")+"/src/weka_usage/exploration_tracks.arff") );	
	Instances training_data = new Instances(breader);
	training_data.setClassIndex(training_data.numAttributes() -1);
	return training_data;

Create new instance with new provided attributes:

public static Instance create_instance(double[] attr, Instances training_data){
	// Create the instance	
	DenseInstance inst = new DenseInstance(4);
	//Instance inst = new DenseInstance(4);
	inst.setValue(0, attr[0]); //web
	inst.setValue(1, attr[1]); //db
        inst.setValue(2, attr[2]); //arrival rate																																																																																																					                               
	inst.setValue(3, attr[3]); // response time
	inst.setDataset(training_data); // assosiate training data with instance to help in its classification
	return inst;

build_classifier method:

public static AbstractClassifier build_classifier(String type, Instances data) throws Exception{

	if(type == "RandomForest"){
		RandomForest rF = new RandomForest();
		return rF;
	else if(type == "MultilayerPerceptron"){
		MultilayerPerceptron rF = new MultilayerPerceptron();
		return rF;
	else if(type == "LinearRegression"){
		LinearRegression rF = new LinearRegression();
		return rF;
		//GaussianProcesses is default
		GaussianProcesses rF = new GaussianProcesses();
		return rF;			

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