Creating a JTree: JTree «Swing «Java Tutorial. public JTree() JTree tree = new JTree(); public JTree(Hashtable value) JTree tree = new JTree(System. JTree; import delEvent; import TreeModelListener; import tMutableTreeNode; import. The idea of custom data models and cell renderers was covered in detail in the Swing tutorial section on JList. JTree is another component that commonly uses.

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Customizing Tree’s Display 5. If we want to find sub classes or super classess of selected class. This method takes an instance of ImageIcon class. The renderer also specifies tool-tip text, as the bold lines show. The Rest of the JDK”, “tutorialcont. We will get the following output: Output Table of Contents: From Beginner to Expert.

Let us now try and develop event handlers for tree. The output shows the root node and the two children. Create JTree from Vector You could always create your own TreeCellRenderer implementation from scratch, reusing whatever components you like.

Creating a JTree : JTree « Swing « Java Tutorial

If you implement a custom object, you should implement its toString method so that it returns the string to be displayed for that node. Because the model is implemented as an Object subclass instead of, say, a subclass of DefaultTreeModelit must implement the TreeModel interface directly. You can easily change the default icon used for leaf, expanded branch, or collapsed branch nodes. Also note that the handler is shown with a different indicator icon.


Selection Listener to get the Selected Node. You can find the custom tree model implementation in GenealogyModel.

Traveling to all the nodes. Drag and drop of a group of files into a tree These can be clicked on to expand the nodes. You can also edit the text in each node. The rendering is represented by an interface called TreeCellRenderer. Every tree has a root node from which all nodes descend.

Using Boolean value cell renderer to display boolean and non-boolean values If you double-click on jtfee root node, you can actually collapse and expand it. Now, try and collapse one of the nodes.

We need to make use of the renderer to do this. This indicates that these nodes have children themselves now. The rest of this section discusses the following topics: Expand one or more nodes. Here is a picture of a tree: We get the following tuttorial Your data model must implement the TreeModel interface.

Let us now run the program. Add comment Notify me of follow-up comments.

Creating a JTree : JTree « Swing « Java Tutorial

Here is an example, taken from TreeIconDemo. Alternatively, to compile and run the example yourself, consult the example index. Thus, each node associated with a BookInfo jrree displays a book name. It is very much possible. For example, to paint a leaf node that has the string “The Java Programming Language”, the tree asks its cell renderer to return a component that can paint a leaf node with that string. It does not require that nodes be represented by DefaultMutableTreeNode objects, or even that nodes implement the TreeNode interface.


Note that although DefaultMutableTreeNode has methods for changing a node’s content, changes should go through the DefaultTreeModel cover methods.

Note the difference in the icon that is displayed prior to the text. How to Use Tool Tips Next page: Finding a Node in a JTree Component. And also if we need to take these event handler outputs to normal Java console instead of JFrame how to do it? Yes, this would definitely add to the performance of an application. Event handling in JTree is very similar to that of other Swing components. Here is a picture of a tree:.

JTree basic tutorial and examples

So, what if we want to hide it? See Drag and Drop and Data Transfer for more details. Working with the Nodes of the Tree. Search backward from last visible row looking for any visible node whose name starts with prefix.