Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.Timer;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;

public class Main {
    private static DefaultTreeModel getTreeModel() {
        return new DefaultTreeModel(new DefaultMutableTreeNode("Root object"));
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame(Main.class.getSimpleName());
        DefaultTreeModel model = getTreeModel();
        JTree tree1 = new JTree(model);
        JTree tree2 = new JTree(model);
        frame.add(new JScrollPane(tree1), BorderLayout.WEST);
        frame.add(new JScrollPane(tree2), BorderLayout.EAST);
        frame.pack();
        frame.setSize(frame.getWidth() + 50, frame.getHeight() + 140);
        frame.setVisible(true);
        Timer t = new Timer(2000, new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                DefaultMutableTreeNode root = (DefaultMutableTreeNode) model.getRoot();
                root.add(new DefaultMutableTreeNode("A new node"));
                model.nodesWereInserted(root, new int[] { root.getChildCount() - 1 });
                tree1.expandRow(0);
                tree2.expandRow(0);
                frame.revalidate();
            }
        });
        t.start();
    }
}