In this tutorial, we are going to implement Swing JTree. The JTree is a class which is used to display the set of hierarchical data.

Swing JTree Example :

In this example, we are going to create a simple swing JTree.

import javax.swing.*;
import javax.swing.tree.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;

class MyTreeDemo extends JFrame {
    JTree tree;
    DefaultMutableTreeNode root, parent1, parent2, child,child1, child2;

    MyTreeDemo() {
        super("JTree Demo");

        root = new DefaultMutableTreeNode("States");
        parent1 = new DefaultMutableTreeNode("Andhra Pradesh");
        child = new DefaultMutableTreeNode("Vijayawada");
        child1 = new DefaultMutableTreeNode("Vizag");
        parent2 = new DefaultMutableTreeNode("Telangana");
        child2 = new DefaultMutableTreeNode("Hyderabad");

        // Adding child nodes to parent
        parent1.add(child);
        parent1.add(child1);
        parent2.add(child2);
        
        // Adding parent nodes to root
        root.add(parent1);
        root.add(parent2);

        // Adding root to JTree
        tree = new JTree(root);

        getContentPane().add(new JScrollPane(tree));
        setSize(300, 300);
        setVisible(true);
    }
}

class JTreeDemo {
    public static void main(String args[]) throws Exception {
        UIManager
                .setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
        new MyTreeDemo();
    }
}

Output :

Happy Learning 🙂