counting the nodes in JTree

ok i have set up my JTree in a simple way:

DefaultMutableTreeNode top = new DefaultMutableTreeNode("Administration");
  DefaultMutableTreeNode D1 = new DefaultMutableTreeNode("Department1");
top.add(D1);
tree = new JTree(top);

so how do i fit the above into this, where do i declare something to be a node?

top and D1 are DefaultMutableTreeNode which is a special kind of TreeNode

you can count all the nodes from the tree using
int allNodesCount = countAllSubChilds(top) ;

you can count all the nodes below D1 using
int sublNodesCount = countAllSubChilds(D1) ;

so finanly if i only wanted to count what is below D1 for example and not what is in D2 ( D2 being a sub node of D1) how whould i do this?

i figured out how to count below D1, but how do i count sub nodes, given that i only have the path or is there a way of retrieving node name?

many thanks

this how you can get selected node (extracting it from the TreePath)

TreePath path = tree.getSelectionPath();
TreeNode node = (TreeNode)path.getLastPathComponent();

I'm just curious ... What do you think is 'GRADE A' Answer ?

>> Name: plaskowj
>> First Login: 11/12/98
>> 
>> Last 10 Grades Given
>> B C B

to be honest i don't really look at the grades- the answer you gave me was great, next time i will rate it as excellent,

thanks anyway

Ps if you want to post a request for rating i will re-rate it with grade A

no, no, no problems ;-)

as I said, I was just curious ....

What's going on with your "JTree simple question" ?

The problem i am having is that firstly I don't want "all" the leafs to be leafs, but instead empty folders- how do i do this?

and i also want to change the leaf icon to something else, how ?

you can easy put your own Leaf icon using

UIManager.put("Tree.leafIcon", new ImageIcon("icon.gif"));

but if you want some leaves to have different icon than other leaves, you'll need to implement custom TreeCellRenderer (that is a component that knows how to render / paint JTree nodes)

can you give me an example of cell rendering?

check this question
https://www.experts-exchange.com/topics/comp/lang/java/Q.10113010
there are some usefull comments there and I'll post some 'simple' code in a few days ...

cheers, but one last thing


where do i put this code?
UIManager.put("Tree.leafIcon", new ImageIcon("icon.gif"));

probably you can put this code anywhere you want (it changes the default TreeLeaf image 'forever')

so why didn't it work- i set the icon.gif- to an icon which i placed in my project

don't know ... it should work ...
I'll check this later and post a comment in the real question :)

(you can take a look at SampleTree example in your Swing directory - they use it too)