JTree adding nodes

Question

Hello all,
I have two questions concerning Trees,
1. I have created the Tree by the JTree(Vector) method, initially the vector does have some elements but i have to add some more later, so when my vector gets updated how can I add the same element to the tree in the form of a node?
2. The Tree being created like this, has automatically generated names for the nodes (i guess it shows the memory address) but i want to change the name of all of my nodes, what is the method for renaming nodes?

Answer 1

There are two pieces of Trees that you have not yet found. The first is the TreeModel, which is accessible through myTree.getModel(). You can use this model to create the data structure; the JTree object is simply a view of that model.
The second piece is the TreeCellRenderer, accessible through myTree.getCellRenderer(). This renderer is used to draw the nodes of the tree and, by default, one is used that renders the Strings returned by the toString() method of the objects in the model. To display different strings, you can either (1) replace the renderer or (2) override the toString() method on the objects in your model. The first is recommended if the strings vary radically from the desired result of toString() or if toString() is being used for something else; the second is recommended for simplistic models or for situations in which the display properly reflects the nature of the object.
Replacing the renderer also allows you to use any JComponent for rendering you wish. This can give you the ability to present gradient backgrouns, dynamically loaded icons, etc.
Many objects in Swing use this format in which there are three portions of an object: the view (which is the standard object, like an instance of JTree, JList, or JTable), the model (which contains the actual data structure), and the renderer (which acts like a rubber stamp to draw the objects without causing more than one object to be instantiated to render thousand-element lists).