How to dynamically add Nodes to JTree?

[javanewbie]

How to add nodes to a Jtree by getting the information into a specific file

For example, in JList:

DefaultListModel workgroups;
workgroups = new DefaultListModel();
List<String> workgroupsList = new ArrayList<String>();
workgroupsList = ParserUtils.getWorkgroupList(ParserUtils.getConfigPath() + "\\.workgroup.properties");
if (!workgroupsList.isEmpty()){
	for (String workgroup : workgroupsList){
		workgroups.addElement(workgroup.toString().trim());
	}
}

workgroupList = new JList(workgroups); //adds the list workgroups

The output of this will be a JList displaying the list of workgroups per line. The list could be found in a file name "workgroup.properties"


Question is, is it possible to adapt this same method in JTree. The information per line will serve as one node in the tree. For example, I have 3 workgroups in the list, there will also be 3 nodes to be found in the tree.


Any suggestions?

THanks.

[hardwired]

Looks straight–forward enough

DefaultMutableTreeNode root = new DefaultMutableTreeNode(...
// every node is a DefaultMutableTreeNode
for each line
    DefaultMutableTreeNode nextChildNode = new DMTN(nextLine)
    root.add(nextChildNode)
    for each list(corresponding to this line) element 
        DefaultMutableTreeNode child = new DMTN(nextListItem)
        nextChildNode.add(child)
...
tree = new JTree(root)

[Steve11235]

All these components have a model that holds their data. The best thing to do is go through the tutorial and the api for each of the sub-components and figure out how they work together. In your case, your want to update the TreeModel

[javanewbie]

Here's an update of what I'm doing with the codes

protected JPanel createServiceCallTreeWorkgroup2() {
    	  
    	
    	 List<String> WGList = new ArrayList<String>();
    		WGList.add("All Workgroups");
    		WGList = ParserUtils.getWorkgroupList(ParserUtils.getConfigPath() + "\\tracker.workgroup.properties");
    		if (!WGList.isEmpty()){
    			for (String workgroup : WGList){
    				WGList.add(workgroup);
    			}
    		}
    		
    		Object hierarchy[] = WGList.toArray();
    		
    		
    		
    		 DefaultMutableTreeNode root = processHierarchy(hierarchy);
    		    JTree WGTree = new JTree(root);
    		    WGTree.setPreferredSize(new Dimension(200, 220));

    	        
    			JPanel WGPane = new JPanel();
    	        WGPane.add(WGTree);
        return WGPane;
    }

and

private DefaultMutableTreeNode processHierarchy(Object[] hierarchy) {
	    DefaultMutableTreeNode node = new DefaultMutableTreeNode(hierarchy[0]);
	    DefaultMutableTreeNode child;
	    for (int i = 1; i < hierarchy.length; i++) {
	      Object nodeSpecifier = hierarchy[i];
	      if (nodeSpecifier instanceof Object[]) // Ie node with children
	      {
	        child = processHierarchy((Object[]) nodeSpecifier);
	      } else {
	        child = new DefaultMutableTreeNode(nodeSpecifier); // Ie Leaf
	      }
	      node.add(child);
	    }
	    return (node);
	  }
	}

Still doesn't work. Any suggestions?