get path file

import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;

import javax.annotation.processing.FilerException;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class DemoFile extends JFrame implements ActionListener {
    String path = getClass().getProtectionDomain().getCodeSource()
            .getLocation().getPath();

    // when use jar file
    String absolutePathJarFile = path.substring(0, path.lastIndexOf("/"))
            + "/duoi hinh bat chu";

    // when run in project
    String absolutePath = "duoi hinh bat chu";

    private File file = new File(absolutePathJarFile);
    private JLabel label, dapan;
    private JButton btNext, btPrev, btDapAn;
    private ArrayList<String> list = new ArrayList<String>();
    private ArrayList<String> listName = new ArrayList<String>();

    private int count = -1;

    public DemoFile() {
        btNext = createButton("Next");
        btPrev = createButton("Prev");
        btDapAn = createButton("Result");
        dapan = new JLabel("Dap An");
        dapan.setFont(new Font("arial", Font.BOLD, 30));

        label = new JLabel("");

        JPanel panel = new JPanel(new FlowLayout());
        JPanel panel1 = new JPanel(new FlowLayout());
        panel1.add(label);

        panel.add(btPrev);
        panel.add(btNext);
        panel.add(btDapAn);

        this.setLayout(new BorderLayout());
        this.add(dapan, BorderLayout.NORTH);
        this.add(panel1, BorderLayout.CENTER);
        this.add(panel, BorderLayout.SOUTH);
        this.setSize(600, 500);
        this.setVisible(true);
    }

    private JButton createButton(String s) {
        JButton bt = new JButton(s);
        bt.addActionListener(this);
        return bt;
    }

    private ImageIcon createIcon(String name) {
        String pathImage = file.getAbsolutePath() + File.separator + name;
        System.out.println(pathImage);
        return new ImageIcon(file.getAbsolutePath() + File.separator + name);
    }

    public void listDirectory(File file) throws FilerException {
        if (!file.exists()) { // kiểm tra xem đường dẫn có tồn tại hay không
            System.out.print("Duong dan khong ton tai");
            return;
        }

        if (file.isDirectory()) {
            String[] listDirectoryChild = file.list();
            for (int i = 0; i < listDirectoryChild.length; i++) {
                listDirectory(new File(file.getPath(), listDirectoryChild[i]));
                listName.add(listDirectoryChild[i]);
            }
            return;
        }
        if (file.isFile()) {
            try {
                list.add(file.getCanonicalPath());
            } catch (IOException e) {
                e.printStackTrace();
            }
            return;
        }

        return;
    }

    public static void main(String args[]) {

        DemoFile demoFile = new DemoFile();
        System.out.println(demoFile.file.getAbsolutePath());
        try {
            demoFile.listDirectory(demoFile.file);
        } catch (FilerException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void actionPerformed(ActionEvent e) {

        if (e.getSource() == btNext) {
            if (++count < list.size()) {
                label.setIcon(createIcon(listName.get(count)));
                dapan.setText("");
            }
        }

        if (e.getSource() == btPrev) {
            if (count > 0) {
                label.setIcon(createIcon(listName.get(--count)));
                dapan.setText("");
            }
        }

        if (e.getSource() == btDapAn) {
            String s = listName.get(count).substring(0,
                    listName.get(count).indexOf("."));
            dapan.setText(s);

        }
    }
}