Membuat Fungsi Simpan/Buka dengan BufferedWriter dan BufferedReader

private void export() {
        DefaultTableModel model = (DefaultTableModel) tdata.getModel();
        try {
            File file = new File(fn);
            if (!file.exists()) {
 
                file.createNewFile();
            }
            FileWriter fw = new FileWriter(file.getAbsoluteFile());
            BufferedWriter bw = new BufferedWriter(fw);
 
            for (int i = 0; i < tdata.getRowCount(); i++) {
                for (int j = 0; j < tdata.getColumnCount(); j++) {
                    bw.write((String) tdata.getModel().getValueAt(i, j) + "#");
                }
                bw.newLine();
            }
            bw.close();
            fw.close();
            System.out.println("Sip Cik");
 
        } catch (IOException ex) {
 
            ex.printStackTrace();
       }
    }

   private void cose() {
        DefaultTableModel model = (DefaultTableModel) tdata.getModel();
        int i = 0;
        try {
            BufferedReader br = new BufferedReader(new FileReader(fn));
            String tem;
            while ((tem = br.readLine()) != null) {
                StringTokenizer st = new StringTokenizer(tem, "#");
                String Kode = st.nextToken();
                String Merek = st.nextToken();
                String Harga = st.nextToken();
                String Jumlah = st.nextToken();
 
                System.out.println(Kode);
                model.addRow(new Object[]{Kode, Merek, Harga, Jumlah});
            }
            br.close();
        } catch (Exception e) {
            System.out.println(e.getMessage());
        }
 
    }

public class main extends javax.swing.JFrame {
private String fn = "D:/file.txt";  //tulis di bawah kode public class