Tree Data Structure in Java Example

 import java.awt.*; 
 import java.util.*; 
 import javax.swing.*; 
 import javax.swing.tree.*; 
 public class JavaExampleTreeDataInJApplet extends JApplet 
 { 
     Hashtable HshTbl = new Hashtable(); 
     Hashtable SbHshTblOne = new Hashtable(); 
     Hashtable SbHshTblTwo = new Hashtable(); 
     String[] Strngs = new String[]{"Item One","Item Two","Item Three","Item Four","Item Five"}; 
     public void init() 
     { 
         Container Cntnr = getContentPane(); 
         HshTbl.put("Items",Strngs); 
         HshTbl.put("Subitems",SbHshTblOne); 
         SbHshTblOne.put("Items",Strngs); 
         SbHshTblOne.put("Item One", new Integer(1)); 
         SbHshTblOne.put("Item Two", new Integer(2)); 
         SbHshTblOne.put("Item Three", new Integer(3)); 
         SbHshTblTwo.put("Items with subitems",SbHshTblTwo); 
         SbHshTblTwo.put("Still More SubItems",Strngs); 
         SbHshTblTwo.put("Item One", new Integer(1)); 
         SbHshTblTwo.put("Item Two", new Integer(2)); 
         SbHshTblTwo.put("Item Three", new Integer(3)); 
         JTree HshTree = new JTree(HshTbl); 
         JScrollPane HshPn = new JScrollPane(HshTree); 
         HshTree.expandPath(new TreePath(HshTree.getModel().getRoot()));    
         Cntnr.add(HshPn); 
     } 
 } 
 /*<APPLET CODE=JavaExampleTreeDataInJApplet.class WIDTH=350 HEIGHT=280></APPLET>*/