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: