// Swing JTreeExample - Derek Molloy

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

  public class JTreeExample extends JFrame
  {	
	JTree myTree;
	

	public JTreeExample()
	{
		super("JTree Example");

		DefaultMutableTreeNode top = new DefaultMutableTreeNode("Student Tree");
		myTree = new JTree(top);		
		DefaultMutableTreeNode ugNode = new DefaultMutableTreeNode("Undergraduate");
		DefaultMutableTreeNode johnDoe = new DefaultMutableTreeNode(
			new Student("John Doe", "912345676", "EE1"));
		DefaultMutableTreeNode janeDoe = new DefaultMutableTreeNode(
			new Student("Jane Doe", "912345677", "ME1"));
		DefaultMutableTreeNode pgNode = new DefaultMutableTreeNode("Postgraduate");
		DefaultMutableTreeNode jamesDoe = new DefaultMutableTreeNode(
			new Student("James Doe", "912345678", "GDE1"));


		top.add(ugNode);
		ugNode.add(johnDoe);
		ugNode.add(janeDoe);
		top.add(pgNode);
		pgNode.add(jamesDoe);

		JScrollPane p = new JScrollPane(this.myTree,
			JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
			JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);

		this.getContentPane().add("Center", p); 	 

		this.pack(); 
		this.show();	 
	}
	
	public static void main(String[] args)
	{
		new JTreeExample();
	}
  }


  class Student 
  {
	private String name;
	private String id;
	private String classname;

	Student(String name, String id, String classname)
	{
		this.name = name;
		this.id = id;
		this.classname = classname;
	}
		
	public String toString()
	{
		return name;
	}
  }