Main.java Source code

Introduction

Here is the source code for Main.java

Source

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

import javax.swing.AbstractAction;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;

public class Main {
    public static void main(String[] args) {
        DefaultMutableTreeNode root = new DefaultMutableTreeNode("root");
        DefaultTreeModel model = new DefaultTreeModel(root);
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.getContentPane().add(new JScrollPane(new JTree(model)));
        f.getContentPane().add(new JButton(new AbstractAction("Add thousand children") {
            @Override
            public void actionPerformed(ActionEvent e) {
                int offset = root.getChildCount() + 1;
                for (int i = 0; i < 1000; i++) {
                    DefaultMutableTreeNode child = new DefaultMutableTreeNode("Person " + (i + offset));
                    // model.insertNodeInto(child, root, root.getChildCount());
                    root.add(child);
                }
                model.nodeStructureChanged(root);
            }
        }), BorderLayout.PAGE_END);
        f.pack();
        f.setVisible(true);
    }
}