how to use select all option in checklistbox in swing java?

Question

In my snippet code! "checkBoxList" has no of files that are chosen by a file chooser and stored in it

check box "tmp" it has checkboxes for the files!

When i display the files[checkboxlist] in my panel.It comes as unchecked! After I have the option for tick/untick it.

I have the below code for select/unselect option

I need to know when I display the files!The files should display with checked(tick) Then I can modify which I can tick/untick.

I stuck on this logic!

[

EDIT: I did and updated answer for this part(see the image).

I Add select/deselectall to the panel(box) and it worked

box.add(chckbxSelectAll);

&& I need&curious to know how to put my selectall checkbox inside my panel

]

public void selectAllMethod() {
Iterator<JCheckBox> i = checkBoxList.iterator();
while (i.hasNext()) {
    JCheckBox tmp = i.next();
        if (chckbxSelectAll.isSelected()) {
            tmp.doClick();
        } else {
            tmp.setSelected(false);
            selectedCounter -= 1;
            if (selectedCounter < 0) {
                selectedCounter = 0;
            }
    noOfFileTxt.setText(Integer.toString(selectedCounter));
        }
    }
}

Here is my button selection method for choosing folder and displaying it in a panel with check box

public void chooseDirectoryFrom() {
    String tempStr = null;
    try {
        UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
        fileChooser = new JFileChooser();
        Font font = new Font("Latha", Font.ITALIC, 10);
        fileChooser.setFont(new Font("Latha", Font.PLAIN, 13));
        fileChooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
        fileChooser.setFont(font);

        int returnVal = fileChooser.showOpenDialog(frame);
        if (returnVal == JFileChooser.APPROVE_OPTION) {
            tempStr = fileChooser.getSelectedFile().getCanonicalPath();
        }
        if (tempStr != null && !tempStr.trim().equals("")) {
            searchBox.setText(tempStr);
            // Enable the search button
        //  btnDisplay.setEnabled(true);
        } else {
            //btnDisplay.setEnabled(false);
        }
    } catch (Exception e) {
        e.printStackTrace();
    }

//  public void selectToDisplay() {            //disabled btn to display
    File sourceFolder = null;
    Box box = Box.createVerticalBox();
    if (boxList.size() != 0) {
        middlePanel.remove(scrollPane);
        middlePanel.repaint();
        frame.repaint();
        boxList = new ArrayList<Box>();
        checkBoxList = new ArrayList<JCheckBox>();
        fileNamesMap = new HashMap<String, String>();
        selectedCounter = 0;
        noOfFileTxt.setText(Integer.toString(selectedCounter));
    }
    sourceFolder = new File(searchBox.getText());
    File[] sourceFilesList = sourceFolder.listFiles();
    JCheckBox cb1 = null;
    for (int i = 0; i < sourceFilesList.length; i++) {
        if (sourceFilesList[i].isFile() & sourceFilesList[i].getName().endsWith(".txt")) {
            fileNamesMap.put(sourceFilesList[i].getAbsolutePath(), sourceFilesList[i].getName());
            cb1 = new JCheckBox(sourceFilesList[i].getAbsolutePath()); 
            cb1.setFont(new Font("Latha", Font.BOLD, 20));
            box.add(cb1);
            checkBoxList.add(cb1);
            cb1.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent e) {
                    if (((AbstractButton) e.getSource()).isSelected()) {
                        selectedCounter += 1;
                    } else {
                        selectedCounter -= 1;
                        if (selectedCounter < 0) {
                            selectedCounter = 0;
                        }
                    }
                    noOfFileTxt.setText(Integer.toString(selectedCounter));
                }
            });
        }
    }

    boxList.add(box);
    scrollPane = new JScrollPane(box);
    scrollPane.setPreferredSize(new Dimension(1050, 350));
   scrollPane.setVerticalScrollBarPolicy ( ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS );
   middlePanel.add ( scrollPane );
   frame.getContentPane().add(middlePanel);
   frame.repaint();
  frame.revalidate();
}

Here is my image(without selection)!When i load the files in the panel

Answer 1

To answer my own question:

Add checkbox set selected inside the for loop and outside the checkbox action listener So that it will perform setselected method!.

 cb1.setSelected(!cb1.isSelected());
             selectedCounter += 1;
             noOfFileTxt.setText(Integer.toString(selectedCounter));



selectedCounter += 1; will display the ticked count to the textfield(noOfFileTxt)

Thank you :)