PLz hlp!! unable to add m

  To: comp.lang.java.gui
Hi ,

I am trying to build a jtree with input from a arraylist.i need to form
a tree as below

OMCR
   |--Shara
   | |--AN-01
   | |---router-1
   | |--AN-02
   | |---router-2
   |---Merc

The nodes in the array list are in child, parent format.

EX:

Child : Parent
Shara : OMCR
AN-01 : Shara
router-1: AN-01
AN-02:Shara
router-2:AN-02

But i am not bale to add the nodes as required.Below is my code.Can
someone pls help me.Im just a week old in java and have not much idea.

DefaultMutableTreeNode root = new DefaultMutableTreeNode("OMCR");
---
---
---
......................DefaultTreeModel treeModel = new
DefaultTreeModel( root );
                                       tree = new JTree( treeModel );
.........................
public void buildTree( DefaultMutableTreeNode root) {

    DefaultMutableTreeNode child, parent,pseudoparent ;
    HashMap name2TreeNode = new HashMap();
    ArrayList matrix1 = new md().md_arraylist();
    String lastchild = null;
    TreePath path = new TreePath (root.getPath());
     String childName;String parentName;

     for(int i = 0; i < matrix1.size();i++){

      pseudoparent = new DefaultMutableTreeNode(lastchild);
        childName = (String)((ArrayList)matrix1.get(i)).get(0) ;
        parentName = (String)((ArrayList)matrix1.get(i)).get(1);
        child = new DefaultMutableTreeNode(childName);
        parent = new DefaultMutableTreeNode(parentName);
        System.out.println(" i : " + i +" from DB parent " + parent + "
child " + child );

      if (parentName.equals("OMCR") ){
            System.out.println("if 1" + " child is : " + child);
              if (root.getIndex(child) == -1){
                root.add(child);
                 lastchild = childName;
                 pseudoparent = child;
                 path = new TreePath (child.getPath());

              }
        }else{
           if (!(lastchild.equals(null))) {
               if (! (lastchild.equals(parentName))) {
              path = new TreePath (parent.getPath());
               parent =(DefaultMutableTreeNode)
path.getLastPathComponent();
                System.out.println("if 2 last child " + lastchild + "
parent" + parent + " child " + child);
              //root.add(parent);
               parent.add(child);
               lastchild =childName;

           }else{
       //lastchild equals parent

           path = new TreePath (pseudoparent.getPath());

            parent =(DefaultMutableTreeNode)
path.getLastPathComponent();

          System.out.println("else part" + "last child " + lastchild +
" parent" + parent + " child " + child);
                parent.add(child);
                lastchild = childName;
           }
        }
        }
       
    
} //end of for
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