How to send position data obtained by for loops to a .txt file in java?

[gondsieg]

I'm inexperienced in java, at this moment I can only see the data of hand.palmPosition () in my .txt, but I need to get bone.center () on all the iterations

I try with:

out.println (hand.finger (fingerID) .bone (Bone.Type.TYPE_DISTAL) .center ());

//cant take the current finger.id, then i just use the previous who i get on another run of the program, like 2035 or something

without success, it only showed "INVALID BONE" in the .txt file

Please help!

This is all the code

@Override
public void onFrame(Controller controller) {
    
    // Get the most recent frame and report some basic information
    Frame frame = controller.frame();
    System.out.println("Frame id: " + frame.id());
    
    //Get hands
    for(Hand hand : frame.hands()) {            
        DateFormat dateFormat = new SimpleDateFormat("HH:mm:ss:SS");
        String currentTime = dateFormat.format(System.currentTimeMillis());
        String handType = hand.isLeft() ? "Mano izquierda" : "Mano derecha";
        
        
        System.out.println("  " + handType 
                                + ", Posicion palma: " + hand.palmPosition());
        
        
        // Get fingers
        for (Finger finger : hand.fingers()) {
            System.out.println("    " + finger.type() + ", id: " + finger.id()
                             + ", longitud: " + finger.length()
                             + "mm, ancho: " + finger.width() + "mm");
            
            //Get Bones
            for(Bone.Type boneType : Bone.Type.values()) {
                Bone bone = finger.bone(boneType);
                System.out.append("      " + bone.type()
                                   + " Centro Hueso: " + bone.center());                    
            }
        }
        //.txt
        File datos = new File("Data.txt");
        try(FileWriter fw = new FileWriter(datos, true);
        BufferedWriter bw = new BufferedWriter(fw);
        PrintWriter out = new PrintWriter(bw))    
        {
        
        out.println(currentTime);
        out.println(frame.id()); 
        out.println(hand.palmPosition().getX());
        out.println(hand.palmPosition().getY());
        out.println(hand.palmPosition().getZ());
        out.println(hand.frame().currentFramesPerSecond());
        out.println(hand.finger(2850).bone(Bone.Type.TYPE_DISTAL).center());
        
        } catch (IOException e){
        e.printStackTrace();
        }
    }
    if (!frame.hands().isEmpty()) {
        System.out.println();            
    } 
}