Java JTree

by Online Tutorials Library July 14, 2022

Java JTree

The JTree class is used to display the tree structured data or hierarchical data. JTree is a complex component. It has a ‘root node’ at the top most which is a parent for all nodes in the tree. It inherits JComponent class.

JTree class declaration

Let’s see the declaration for javax.swing.JTree class.

Commonly used Constructors:

Constructor	Description
JTree()	Creates a JTree with a sample model.
JTree(Object[] value)	Creates a JTree with every element of the specified array as the child of a new root node.
JTree(TreeNode root)	Creates a JTree with the specified TreeNode as its root, which displays the root node.

Java JTree Example

 import javax.swing.*; import javax.swing.tree.DefaultMutableTreeNode; public class TreeExample { JFrame f; TreeExample(){ f=new JFrame(); DefaultMutableTreeNode style=new DefaultMutableTreeNode(“Style”); DefaultMutableTreeNode color=new DefaultMutableTreeNode(“color”); DefaultMutableTreeNode font=new DefaultMutableTreeNode(“font”); style.add(color); style.add(font); DefaultMutableTreeNode red=new DefaultMutableTreeNode(“red”); DefaultMutableTreeNode blue=new DefaultMutableTreeNode(“blue”); DefaultMutableTreeNode black=new DefaultMutableTreeNode(“black”); DefaultMutableTreeNode green=new DefaultMutableTreeNode(“green”); color.add(red); color.add(blue); color.add(black); color.add(green); JTree jt=new JTree(style); f.add(jt); f.setSize(200,200); f.setVisible(true); } public static void main(String[] args) { new TreeExample(); }} 

Output:

JAVA Jtree 1

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JTree class declaration

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