MainClass.java Source code

Introduction

Here is the source code for MainClass.java

Source

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

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.JTree;
import javax.swing.ScrollPaneConstants;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.TreePath;

public class MainClass extends JPanel {

    public MainClass() {
        final JTree tree;
        final JTextField jtf;

        DefaultMutableTreeNode top = new DefaultMutableTreeNode("Options");

        DefaultMutableTreeNode a = new DefaultMutableTreeNode("A");
        top.add(a);
        DefaultMutableTreeNode a1 = new DefaultMutableTreeNode("A1");
        a.add(a1);
        DefaultMutableTreeNode a2 = new DefaultMutableTreeNode("A2");
        a.add(a2);

        DefaultMutableTreeNode b = new DefaultMutableTreeNode("B");
        top.add(b);
        DefaultMutableTreeNode b1 = new DefaultMutableTreeNode("B1");
        b.add(b1);
        DefaultMutableTreeNode b2 = new DefaultMutableTreeNode("B2");
        b.add(b2);
        DefaultMutableTreeNode b3 = new DefaultMutableTreeNode("B3");
        b.add(b3);

        tree = new JTree(top);

        JScrollPane jsp = new JScrollPane(tree);

        add(jsp, BorderLayout.CENTER);

        jtf = new JTextField("", 20);
        add(jtf, BorderLayout.SOUTH);

        tree.addMouseListener(new MouseAdapter() {
            public void mouseClicked(MouseEvent me) {
                TreePath tp = tree.getPathForLocation(me.getX(), me.getY());
                if (tp != null)
                    jtf.setText(tp.toString());
                else
                    jtf.setText("");
            }
        });

    }

    public static void main(String[] args) {
        JFrame frame = new JFrame();
        frame.getContentPane().add(new MainClass());

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(200, 200);
        frame.setVisible(true);
    }
}