This post is intended to beginners of java swing toolkit programmers.
It is a simple java program which demonstrates the swing based File explorer GUI.
import java.awt.GridLayout;
import java.io.File;
import java.lang.reflect.InvocationTargetException;
import java.util.Arrays;
import java.util.List;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.event.TreeModelListener;
import javax.swing.tree.TreeModel;
import javax.swing.tree.TreePath;
/**
* @author NagasharathK
*
*/
public class FileExplorer extends JFrame {
private JTree fileManagerTree = null;
public FileExplorer() {
initComponents();
}
/**
* Initializes components
*/
private void initComponents() {
this.getContentPane().add(new JScrollPane(createFileManagerTree()));
this.setSize(500, 500);
this.setResizable(true);
this.setTitle("File Manager..");
}
/**
* @return JPanel object which contains other comp...
*/
private JPanel createFileManagerTree() {
JPanel panel = new JPanel();
panel.setLayout(new GridLayout());
fileManagerTree = new JTree();
fileManagerTree.setModel(new FilesContentProvider("C:\\"));
panel.add(fileManagerTree);
return panel;
}
class FilesContentProvider implements TreeModel {
private File node;
public FilesContentProvider(String path) {
node = new File(path);
}
@Override
public void addTreeModelListener(TreeModelListener l) {
}
@Override
public Object getChild(Object parent, int index) {
if (parent == null)
return null;
return ((File) parent).listFiles()[index];
}
@Override
public int getChildCount(Object parent) {
if (parent == null)
return 0;
return (((File) parent).listFiles() != null) ? ((File) parent).listFiles().length : 0;
}
@Override
public int getIndexOfChild(Object parent, Object child) {
List<File> list = Arrays.asList(((File) parent).listFiles());
return list.indexOf(child);
}
@Override
public Object getRoot() {
return node;
}
@Override
public boolean isLeaf(Object node) {
return ((File) node).isFile();
}
@Override
public void removeTreeModelListener(TreeModelListener l) {
}
@Override
public void valueForPathChanged(TreePath path, Object newValue) {
}
}
/**
* @param args
* @throws InvocationTargetException
* @throws InterruptedException
* @throws UnsupportedLookAndFeelException
* @throws IllegalAccessException
* @throws InstantiationException
* @throws ClassNotFoundException
*/
public static void main(String[] args) throws InvocationTargetException, InterruptedException,
ClassNotFoundException, InstantiationException, IllegalAccessException, UnsupportedLookAndFeelException {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
FileExplorer explorerUI = new FileExplorer();
SwingUtilities.invokeAndWait(new Runnable() {
@Override
public void run() {
explorerUI.setVisible(true);
}
});
}
}
The above program has one inner class [FilesContentProvider] which serves as a model to the JTree.
The UI has 4 Components: JFrame, JScrollPane, JPanel and JTree.
To Do:
- Add Context menu to node based upon the file type
- Add Cell renderer to give proper names to the Nodes
- Option to Expand whole tree or selected node etc..
