Read Writer button wont add to file.

my writer reader wont save data and add data to the file. When i run it all it does is overwrites the data. code is :

Code java:

   String add = nameField.getText();
        String newLine = ("\n");
        File file = new File("C:NewTest.dat");
        try {
// check whether the file is existed or not
            if (file.exists()) {
 
                // create a new file if the file is not existed
                file.createNewFile();
            }
            // new a writer and point the writer to the file
            BufferedWriter writer = new BufferedWriter(new FileWriter(file));
            // writer the content to the file
            writer.write(newLine);
            writer.write(add);
            // always remember to close the writer
            writer.close();
            writer = null;
        } catch (IOException ab) {
            ab.printStackTrace();
        }
        try {
            // new a reader and point the reader to the file
            BufferedReader reader = new BufferedReader(new FileReader(file));
            nameArea.append(add + newLine);
            reader.close();
            reader = null;
        } catch (FileNotFoundException ab) {
            ab.printStackTrace();
        } catch (IOException ab) {
            ab.printStackTrace();
        }