Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreeCellRenderer;
import javax.swing.tree.TreePath;

public class Main {
    public static void main(String[] args) {

        DefaultMutableTreeNode root = new DefaultMutableTreeNode(Boolean.TRUE);
        DefaultMutableTreeNode child1 = new DefaultMutableTreeNode(Boolean.FALSE);
        DefaultMutableTreeNode child2 = new DefaultMutableTreeNode(Boolean.FALSE);
        root.add(child1);
        root.add(child2);
        DefaultTreeModel model = new DefaultTreeModel(root);

        JTree tree = new JTree(model);
        tree.setCellRenderer(new TreeRenderer());

        tree.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseClicked(MouseEvent e) {
                TreePath pathForLocation = tree.getPathForLocation(e.getX(), e.getY());
                Object lastPathComponent = pathForLocation.getLastPathComponent();
                if (lastPathComponent instanceof DefaultMutableTreeNode) {
                    Boolean oldObject = (Boolean) ((DefaultMutableTreeNode) lastPathComponent).getUserObject();
                    ((DefaultMutableTreeNode) lastPathComponent).setUserObject(!oldObject);
                    model.nodeChanged((DefaultMutableTreeNode) lastPathComponent);
                }
            }
        });

        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().setLayout(new BorderLayout());
        frame.getContentPane().add(tree, BorderLayout.CENTER);
        frame.setSize(800, 600);
        frame.setVisible(true);
    }
}

class TreeRenderer implements TreeCellRenderer {
    private final JCheckBox checkbox = new JCheckBox();

    @Override
    public Component getTreeCellRendererComponent(JTree tree, Object value, boolean selected, boolean expanded,
            boolean leaf, int row, boolean hasFocus) {
        DefaultMutableTreeNode node = (DefaultMutableTreeNode) value;
        checkbox.setSelected((Boolean) node.getUserObject());
        checkbox.setText("Row:" + row);
        return checkbox;
    }
}