JButton btnx1y1 = new JButton(">");
        btnx1y1.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                try {
                    String filePath = "C:\Users\Admin\workspace\generator\data\f.xml";
                    File inputFile = new File(filePath);
                    DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
                    DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
                    Document document = dBuilder.parse(inputFile);

                    Node control = document.getElementsByTagName("control").item(0);

                    NamedNodeMap attr = control.getAttributes();
                    Node nodeAttr = attr.getNamedItem("xpos");
                    nodeAttr.setTextContent(str201x);
                    attr.getNamedItem("ypos").setTextContent(str201y);

                    NodeList list = control.getChildNodes();


                    TransformerFactory transformerFactory = TransformerFactory.newInstance();
                    Transformer transformer= transformerFactory.newTransformer();
                    DOMSource source = new DOMSource(document);
                    StreamResult result=new StreamResult(new File(filePath));
                    transformer.transform(source, result);

                    StreamResult consoleResult = new StreamResult(System.out);
                    transformer.transform(source, consoleResult);

            }catch (Exception e1){
                e1.printStackTrace();
            }

            }
        });

textR201x = new JTextField();
String str201x=textR201x.getText();
str201x="";

textR201y = new JTextField();
String str201y=textR201y.getText();
str201y="";

<control name="control_200" xpos="233" ypos="25" width="60" type="float" format="%7.2f" refvar="gud/_ZSFR[29]" hotlink="true">