Source Code : Displaying Hierarchical Data within a JTree

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Displaying Hierarchical Data within a JTree

    
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Container;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.TreeCellRenderer;
import javax.swing.tree.TreePath;

public class TreeIt {

  class MyCellRenderer extends JLabel implements TreeCellRenderer {
    MyCellRenderer() {
      setOpaque(true);
    }

    public Component getTreeCellRendererComponent(JTree tree, Object value,
        boolean selected, boolean expanded, boolean leaf, int row,
        boolean hasFocus) {
      StringBuffer text = new StringBuffer();
      if (expanded)
        text.append("E:");
      if (leaf)
        text.append("L:");
      if (hasFocus)
        text.append("H:");
      text.append(row + "->");
      text.append(value.toString());

      setBackground(selected ? Color.BLUE : Color.YELLOW);
      setForeground(selected ? Color.YELLOW : Color.BLUE);

      setText(text.toString());
      return this;
    }
  }

  public TreeIt() {
    JFrame f = new JFrame();
    DefaultMutableTreeNode root = new DefaultMutableTreeNode("Calendar");
    DefaultMutableTreeNode months = new DefaultMutableTreeNode("Months");
    root.add(months);
    String monthLabels[] = { "January", "February", "March", "April",
        "May", "June", "July", "August", "September", "October",
        "November", "December" };
    for (int i = 0, n = monthLabels.length; i < n; i++)
      months.add(new DefaultMutableTreeNode(monthLabels[i]));
    DefaultMutableTreeNode weeks = new DefaultMutableTreeNode("Weeks");
    root.add(weeks);
    String weekLabels[] = { "Monday", "Tuesday", "Wednesday", "Thursday",
        "Friday", "Saturday", "Sunday" };
    for (int i = 0, n = weekLabels.length; i < n; i++)
      weeks.add(new DefaultMutableTreeNode(weekLabels[i]));
    JTree jt = new JTree(root);
    jt.addTreeSelectionListener(new TreeSelectionListener() {
      public void valueChanged(TreeSelectionEvent e) {
        TreePath path = e.getPath();
        System.out.println("Picked: " + path.getLastPathComponent());
        Object elements[] = path.getPath();
        for (int i = 0, n = elements.length; i < n; i++) {
          System.out.print("->" + elements[i]);
        }
        System.out.println();
      }
    });

    DefaultMutableTreeNode lastLeaf = root.getLastLeaf();
    TreePath path = new TreePath(lastLeaf.getPath());
    jt.setSelectionPath(path);

    jt.setCellRenderer(new MyCellRenderer());

    JScrollPane jsp = new JScrollPane(jt);
    Container c = f.getContentPane();
    c.add(jsp, BorderLayout.CENTER);
    f.setSize(250, 250);
    f.show();
  }

  public static void main(String args[]) {
    new TreeIt();
  }
}


           
         
    
    
    
  

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