import javax.swing.*;
import javax.swing.tree.DefaultMutableTreeNode;

public class SwingTree {
    public SwingTree() {
        JFrame frame = new JFrame();

        DefaultMutableTreeNode style = new DefaultMutableTreeNode("Trees");
        DefaultMutableTreeNode deciduous = new DefaultMutableTreeNode("Deciduous");
        DefaultMutableTreeNode evergreen = new DefaultMutableTreeNode("Evergreen");

        style.add(deciduous);
        style.add(evergreen);

        DefaultMutableTreeNode maple = new DefaultMutableTreeNode("Maple");
        DefaultMutableTreeNode oak = new DefaultMutableTreeNode("Oak");
        DefaultMutableTreeNode linden = new DefaultMutableTreeNode("Linden");

        deciduous.add(maple);
        deciduous.add(oak);
        deciduous.add(linden);

        DefaultMutableTreeNode pine = new DefaultMutableTreeNode("Pine");
        DefaultMutableTreeNode balsam = new DefaultMutableTreeNode("Balsam");
        DefaultMutableTreeNode spruce = new DefaultMutableTreeNode("Spruce");

        evergreen.add(pine);
        evergreen.add(balsam);
        evergreen.add(spruce);

        JTree tree = new JTree(style);
        frame.add(tree);
        frame.setSize(1920, 1080);
        frame.setVisible(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }

    public static void main(String[] args) {
        new SwingTree();
    }
}