How to save and load checkBox states and text Field values in java?

Question

I have been wondering about saving and loading jcheckbox and jtextfields values in Java. Is it possible to save and load jcheckbox and jtextfields values? I have attached the picture of a small program in which I would like to save the values of checkbox and load them to review later. Do I use JFileChooser to do the operation?

   public class Try extends JFrame {
   private JPanel contentPane;
   private JCheckBox chckbx_1;
private JCheckBox chckbx_2;
private JTextField textField;
private JTextField textField_1;

/**
 * Launch the application.
 */
public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
        public void run() {
            try {
                Try frame = new Try();
                frame.setVisible(true);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    });
}

/**
 * Create the frame.
 */
public Try() {
    setTitle("Price tag");
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setBounds(100, 100, 450, 300);
    contentPane = new JPanel();
    contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
    setContentPane(contentPane);
    contentPane.setLayout(null);

    chckbx_1 = new JCheckBox("Price");
    chckbx_1.addItemListener(new ItemListener() {
        public void itemStateChanged(ItemEvent e) {
            if(e.getStateChange() == ItemEvent.SELECTED){
                textField.setEnabled(true);
                textField.setText("");
            }
            else if(e.getStateChange() == ItemEvent.DESELECTED){
                textField.setEnabled(false);
                textField.setText("");
        }
        }
    });

    chckbx_1.setBounds(72, 7, 81, 41);
    contentPane.add(chckbx_1);

    chckbx_2 = new JCheckBox("New Price");
    chckbx_2.addItemListener(new ItemListener() {
         @Override
        public void itemStateChanged(ItemEvent e) {
            if(e.getStateChange() == ItemEvent.SELECTED){
                textField.setEnabled(true);
                textField.setText("");
            }
            else if(e.getStateChange() == ItemEvent.DESELECTED){
                textField_1.setEnabled(false);
                textField_1.setText("");
        }
        }
    });
    chckbx_2.setBounds(72, 51, 89, 50);
    contentPane.add(chckbx_2);

    textField = new JTextField();
    textField.setBounds(196, 17, 86, 20);
    contentPane.add(textField);
    textField.setColumns(10);

    textField_1 = new JTextField();
    textField_1.setBounds(196, 66, 86, 20);
    contentPane.add(textField_1);
    textField_1.setColumns(10);

    JButton btn1 = new JButton("Save");
    btn1.setBounds(193, 173, 89, 23);
    contentPane.add(btn1);

    JButton btn2 = new JButton("Load");
    btn2.setBounds(314, 173, 89, 23);
    contentPane.add(btn2);
}}

Answer 1

The variables that you should use are :

 private FileWriter fw;
 private PrintWriter pw;
 private BufferedReader br;

For Saving the checkbox status and textfield value you can use FileWriter and PrintWriter to save in file:

btn1.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                String desktopPath = System.getProperty("user.home") + "/Desktop/";
                try {
                    fw = new FileWriter(desktopPath + "yourfile.txt");
                } catch (IOException ex) {
                    System.out.println("Error : " + ex);
                }
                pw = new PrintWriter(fw);
                pw.println(chckbx_1.isSelected() + "-" + textField.getText() + "-" + chckbx_2.isSelected()
                        + " -" + textField_1.getText());
                if (pw != null) {
                    pw.close();
                }
            }
        });

And for reading from the file you can use BufferedReader and use StringTokenizer for splitting the read line from the file :

btn2.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                String desktopPath = System.getProperty("user.home") + "/Desktop/";
                try {
                    String sCurrentLine;
                    br = new BufferedReader(new FileReader(desktopPath + "yourfile.txt"));
                    while ((sCurrentLine = br.readLine()) != null) {
                        StringTokenizer tokenizer = new StringTokenizer(sCurrentLine, "-");
                        if (tokenizer.hasMoreElements()) {
                             Boolean boolean1 = Boolean.valueOf(tokenizer.nextToken());
                             chckbx_1.setSelected(boolean1);
                        }
                        if (tokenizer.hasMoreElements()) {
                            textField.setText(tokenizer.nextToken());
                        }
                        if (tokenizer.hasMoreElements()) {
                             Boolean boolean1 = Boolean.valueOf(tokenizer.nextToken());
                             chckbx_2.setSelected(boolean1);
                        }
                        if (tokenizer.hasMoreElements()) {
                            textField_1.setText(tokenizer.nextToken());
                        }

                    }
                } catch (FileNotFoundException ex) {
                    System.out.println("Error : " + ex);
                } catch (IOException ex) {
                    System.out.println("Error : " + ex);
                }
            }
        });

And if you want to read from multi-file u can use JFileChooser like :

    btn2.addActionListener(new ActionListener() {
                @Override
                    public void actionPerformed(ActionEvent e) {
                        JFileChooser fc = new JFileChooser();
                        int ret = fc.showOpenDialog(null);
                        if (ret == JFileChooser.APPROVE_OPTION) {
                            File file = fc.getSelectedFile();
                             filename = file.getAbsolutePath();
                        }
....

and then, put the code for read:

br = new BufferedReader(new FileReader(filename));

Answer 2

You can make this by saving CheckBox selected index and text field to a file for example .txt and formating like

StateCheckBox1|2|StateTextField1|example

Then, when you read it you will take whole line and using .split() method, saving it to a String array.

Of course the better idea is to use Database, but if you want to save only few states, you no need to use it.

Otherwise if you are not closing you application, and want to load previous state of your's components, you can make Object for example. StateHolder which one hold your states.

If you want some more explanation about how to make this .txt just ask. I will try to explain it to you.