Showing PLUS sign(tree expansion) even if child is not present

Hi,

I want to create Tree in which there will be single Parent node and multiple child nodes. I want to create these child node after user click on PLUS sign which is used for Tree Expansion. I can add nodes in JTree using TreeExpansionListener's method treeExpanded. But I have problem in showing PLUS sign with Parent Node. As if childs are not present this sign does not come, it comes after adding first child. So I am thinking of adding dummy child to get this PLUS sign, when user clicks it I will remove dummy child and will add actual childs.

Is there any other better way by which I can show PLUS sign(tree expansion icon) at parent node even if parent does not have any child.

Thanks,
Sham

That means that your TreeNode object is returning "false" when its "isLeaf()" method is called. That's what you have to fix.

Thanks Paul, now I am able to get PLUS sign even if childs are not present under parent node.
Now I want to create child nodes when user clicks PLUS sign. Which event get generated in this case, I tried TreeExpansionLIstener and TreeWillEXpandListener.
Do I need to simply catch mouse event?

It seems you are referring to Lazy Loading
http://docs.oracle.com/javase/tutorial/uiswing/components/tree.html