How to select multiple files in JFileChooser window

Question

I can't figure out how to select more than one file at a time in the JFileChooser window. I think it is already enabled because I used the setMultiSelectionEnabled(true) method on the JFileChooser object, but when I try to actually select more than one, I can't do it. I tried click and drag, CTRL and arrow keys/click, Alt and arrow Keys/click, Shift and arrow keys/click but still no luck. How can I do this?

Code where I create the JFileChooser: The parse methods are working fine when using only one file. This class is called when a button is presses in the JFrame.

public class FileChooser implements ActionListener, Runnable
{
    private Parser parser = new Parser();
    private static File[] selectedFiles;
    private static File currentSelected;
    private JFileChooser jfc;

    public static File getSelectedFile()
    {
    return currentSelected;
}

public void actionPerformed(ActionEvent actionEvent)
{
        new Thread(this).start();
}

public void run()
{
    if ( Window.bFG5IsPressed() && Window.bFGAIsPressed() )
    {
        jfc  = new JFileChooser(FileSystemView.getFileSystemView().getHomeDirectory());
        jfc.setMultiSelectionEnabled(true);
        int returnValue = jfc.showOpenDialog(null);

        if (returnValue == JFileChooser.APPROVE_OPTION)
        {
            selectedFiles = jfc.getSelectedFiles();
            for (File e : selectedFiles) {
                currentSelected = e;
                parser.parseAll(e.getAbsolutePath());
            }
        }
    }
    else if ( Window.bFG5IsPressed() )
    {
        jfc  = new JFileChooser(FileSystemView.getFileSystemView().getHomeDirectory());
        int returnValue = jfc.showOpenDialog(null);

        if (returnValue == JFileChooser.APPROVE_OPTION)
        {
            selectedFiles = jfc.getSelectedFiles();
            for (File e : selectedFiles) {
                currentSelected = e;
                parser.parseFG5(e.getAbsolutePath());
            }
        }

    }
    else if ( Window.bFGAIsPressed() )
    {
        jfc  = new JFileChooser(FileSystemView.getFileSystemView().getHomeDirectory());
        int returnValue = jfc.showOpenDialog(null);

        if (returnValue == JFileChooser.APPROVE_OPTION)
        {
            selectedFiles = jfc.getSelectedFiles();
            for (File e : selectedFiles) {
                currentSelected = e;
                parser.parseFGA(e.getAbsolutePath());
            }
        }

    }
    else
    {
        JOptionPane x = new JOptionPane();
        x.showMessageDialog(x, "Escolher tipo de arquivo");
        x.setLocation(300,300);
        x.setVisible(true);
    }
}

}

Answer 1

Call setMultiSelectionEnabled(true). Here is a running sample:

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.util.Arrays;

public class MultipleFileChooser extends JFrame {
    public static void main(String[] args) {
        MultipleFileChooser multipleFileChooser = new MultipleFileChooser();
        JFileChooser fileChooser = new JFileChooser();
        fileChooser.setMultiSelectionEnabled(true);
        JButton button = new JButton("Open Files");
        button.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                int choice = fileChooser.showOpenDialog(multipleFileChooser);
                if (choice == JFileChooser.APPROVE_OPTION) {
                    File[] openFiles = fileChooser.getSelectedFiles();
                    System.out.println("Files: " + Arrays.toString(openFiles));
                }
            }
        });
        JPanel panel = new JPanel();
        panel.add(button);
        multipleFileChooser.add(panel);
        multipleFileChooser.setSize(new Dimension(400, 400));
        multipleFileChooser.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        multipleFileChooser.setVisible(true);
    }
}

Attaching screenshot for OP's reference: