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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Then, resize the frame to use less height.

Dynamic Tree : JTree « Swing « Java Tutorial

We can see that the icon displayed for the ‘Vegetables’ and ‘Fruits’ node has changed from a leaf icon to a folder icon. The default is false.

From Beginner to Expert. Set whether the tree shows handles for its leftmost nodes, letting you expand and collapse the nodes.

Creating a JTree : JTree « Swing « Java Tutorial

Ttutorial scroll bar appears when it has items beyond the display area. We can see that now a scrollbar is added and we can scroll to see the nodes. Cracking the Coding Interview: Knowing the currently selected node will be one of the most useful events to know. Interestingly, the TreeModel interface accepts any kind of object as a tree node. Set or get the selection mode. Using Vector to store JTree values Have a popup hutorial to a JTree Get the object representing the currently selected node.

The no-argument version of this constructor is for use in builders; it creates a tree that contains some sample data. Let us now run the program again, click on the handler tutprial to expand the nodes and resize the frame.


The source of the selection is passed as a parameter to this method. Let us first declare a JLabel instance variable: The following figure shows an application called DynamicTreeDemo that lets you add nodes to and remove nodes from a visible tree.

Tutoriwl look and feels might have different icons for expanded branches versus collapsed branches. The following code shows the selection-related code from the TreeDemo program:. Hiding Root Node 8.

The first line uses the standard mechanism to load images where the image is part of the application packaged within the jar. Note the difference in the icon that is displayed prior to the text.

Creating a JTree : JTree « Swing « Java Tutorial

I thought of an ContainerListener, but that doesn’t work. Notify me of follow-up comments. If you want finer control over the node icons or you want to provide tool tips, you can do so by creating a subclass of DefaultTreeCellRenderer and overriding the getTreeCellRendererComponent method.

Find the path regardless of visibility that matches the tuyorial sequence of names If the argument is true, a node is a leaf only if its getAllowsChildren method returns false. A hidden node is one which is under a collapsed ancestor. By default, all branch nodes except the root node start out mtree. I’m researching them, and you help me a lot!

Like many other Swing components, we just need to wrap our tree within a JScrollPane and add it to the frame. If the tree does not show the root node, then you should invoke setShowsRootHandles true. Maybe you could answer another JTree related question Expanded Tree Once we expand the nodes, we can see all the items in the tree displayed in a nice hierarchical structure.


The renderer also specifies tool-tip text, as the bold lines show. The code creates a node, inserts it into the tree model, and then, if appropriate, requests that the nodes above it be expanded and the tree scrolled so that the new node is visible.

Using Boolean value cell renderer to display boolean and non-boolean values. It also has code for customizing the line style for the Java look and feel. For example, if you have a pre-existing tutotial data structure, you do not need to duplicate it or force it into the TreeNode mold.

A JTree object does not actually contain your data; it simply provides a view of the data. Second, you can use tree.

A node can either have children or not. Set or get whether the tree attempts to scroll to show previous hidden nodes. Tree with Root Node Hidden.

This can be done with a simple API call such as: Developing a Simple JTree 3.