Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.awt.BorderLayout;

import javax.swing.JFrame;
import javax.swing.JTree;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreeModel;
import javax.swing.tree.TreeSelectionModel;

public class Main extends JFrame {
    public Main() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        DefaultMutableTreeNode root = new DefaultMutableTreeNode("abcde");
        DefaultMutableTreeNode node = new DefaultMutableTreeNode("1");
        node.add(new DefaultMutableTreeNode("12345"));
        node.add(new DefaultMutableTreeNode("testing"));
        root.add(node);
        root.add(new DefaultMutableTreeNode("1234567890"));

        TreeModel tm = new DefaultTreeModel(root);
        JTree tree = new JTree(tm);
        tree.getSelectionModel().addTreeSelectionListener(new Selector());
        tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
        getContentPane().add(tree, BorderLayout.CENTER);
        pack();
        setVisible(true);
    }

    private class Selector implements TreeSelectionListener {
        public void valueChanged(TreeSelectionEvent event) {
            Object obj = event.getNewLeadSelectionPath().getLastPathComponent();
            System.out.println("" + obj.toString().length());
        }
    }

    public static void main(String[] args) {
        Main m = new Main();
    }
}