MainClass.java Source code

Introduction

Here is the source code for MainClass.java

Source

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.io.File;
import java.util.ArrayList;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.tree.DefaultMutableTreeNode;

public class MainClass extends JPanel {
    public MainClass(File dir) {
        setLayout(new BorderLayout());
        JTree tree = new JTree(addNodes(null, dir));

        tree.addTreeSelectionListener(new TreeSelectionListener() {
            public void valueChanged(TreeSelectionEvent e) {
                DefaultMutableTreeNode node = (DefaultMutableTreeNode) e.getPath().getLastPathComponent();
                System.out.println("You selected " + node);
            }
        });

        JScrollPane scrollpane = new JScrollPane();
        scrollpane.getViewport().add(tree);
        add(BorderLayout.CENTER, scrollpane);
    }

    DefaultMutableTreeNode addNodes(DefaultMutableTreeNode curTop, File dir) {
        String curPath = dir.getPath();
        DefaultMutableTreeNode curDir = new DefaultMutableTreeNode(curPath);
        if (curTop != null) {
            curTop.add(curDir);
        }
        ArrayList ol = new ArrayList();
        String[] tmp = dir.list();
        for (int i = 0; i < tmp.length; i++)
            ol.add(tmp[i]);
        File f;
        ArrayList files = new ArrayList();

        for (int i = 0; i < ol.size(); i++) {
            String thisObject = (String) ol.get(i);
            String newPath;
            if (curPath.equals("."))
                newPath = thisObject;
            else
                newPath = curPath + File.separator + thisObject;
            if ((f = new File(newPath)).isDirectory())
                addNodes(curDir, f);
            else
                files.add(thisObject);
        }
        for (int fnum = 0; fnum < files.size(); fnum++)
            curDir.add(new DefaultMutableTreeNode(files.get(fnum)));
        return curDir;
    }

    public Dimension getMinimumSize() {
        return new Dimension(200, 400);
    }

    public Dimension getPreferredSize() {
        return new Dimension(200, 400);
    }

    public static void main(String[] av) {
        JFrame frame = new JFrame("MainClass");
        frame.setForeground(Color.black);
        frame.setBackground(Color.lightGray);
        Container cp = frame.getContentPane();
        cp.add(new MainClass(new File(".")));

        frame.pack();
        frame.setVisible(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
}