Practical 7: Write a program to create a Jtree.

1) Write a program to demonstrate the use of tree component in swing
Ans:

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

public class JTreeDemo
{
    public static void main(String[] args) {
        
        JFrame JFrameMain = new JFrame();
        JFrameMain.setVisible(true);
        JFrameMain.setSize(400,400);

        DefaultMutableTreeNode rootNode = new DefaultMutableTreeNode("India");
        
        DefaultMutableTreeNode maharashtraNode = new DefaultMutableTreeNode("Maharashtra");
        DefaultMutableTreeNode gujrathNode = new DefaultMutableTreeNode("Gujrath");
        rootNode.add(maharashtraNode);
        rootNode.add(gujrathNode);
        
        DefaultMutableTreeNode mumbaiSubNode = new DefaultMutableTreeNode("Mumbai");
        DefaultMutableTreeNode puneSubNode = new DefaultMutableTreeNode("Pune");
        DefaultMutableTreeNode nashikSubNode = new DefaultMutableTreeNode("Nashik");
        DefaultMutableTreeNode nagpurSubNode = new DefaultMutableTreeNode("Nagpur");
        
        maharashtraNode.add(mumbaiSubNode);
        maharashtraNode.add(puneSubNode);
        maharashtraNode.add(nashikSubNode);
        maharashtraNode.add(nagpurSubNode);

        JTree tree = new JTree(rootNode);   

        JFrameMain.add(tree);
    }

}

Output:

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