import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;

class BoxLayoutTest extends Frame {
    BoxLayoutTest() {
        JPanel explorer = new JPanel();
        
        explorer.setLayout(new BoxLayout(explorer, BoxLayout.Y_AXIS));

        // Label showing current path
        JLabel currentPath = new JLabel("root/java");
        currentPath.setAlignmentX( LEFT_ALIGNMENT );

        // add a folder button
        JButton addFolder = new JButton("add folder");
        addFolder.setSize(10, 5);
        addFolder.setAlignmentX(RIGHT_ALIGNMENT);

        // add a file button
        JButton addFile = new JButton("add file");
        addFile.setSize(10, 5);
        addFile.setAlignmentX(RIGHT_ALIGNMENT);

        // Labels of subdirectories
        ArrayList childrens = new ArrayList();
        childrens.add(new JLabel("java"));
        childrens.add(new JLabel("cpp"));
        childrens.add(new JLabel("python"));

        explorer.add(currentPath);
        explorer.add(addFolder);
        explorer.add(addFile);

        Object[] labels = childrens.toArray();

        for (Object l : labels) {
            JLabel label = (JLabel)l;
            label.setAlignmentX( LEFT_ALIGNMENT );
            explorer.add(label);
        }

        addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });

        add("West", explorer);
        setSize(700, 700);
        setVisible(true);
    }

    public static void main(String[] args) {
        BoxLayoutTest win = new BoxLayoutTest();
    }
}