MainClass.java Source code

Introduction

Here is the source code for MainClass.java

Source

import java.awt.BorderLayout;

import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JTree;
import javax.swing.UIManager;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;

public class MainClass extends JFrame {
    JTree tree;

    DefaultTreeModel treeModel;

    public MainClass() {
        super("Tree Test Example");
        setSize(200, 150);
        setDefaultCloseOperation(EXIT_ON_CLOSE);

        UIManager.put("Tree.leafIcon", new ImageIcon("leafIcon.gif"));
        UIManager.put("Tree.openIcon", new ImageIcon("openIcon.gif"));
        UIManager.put("Tree.closedIcon", new ImageIcon("closedIcon.gif"));
        UIManager.put("Tree.expandedIcon", new ImageIcon("expandedIcon.gif"));
        UIManager.put("Tree.collapsedIcon", new ImageIcon("collapsedIcon"));
    }

    public void init() {
        DefaultMutableTreeNode root = new DefaultMutableTreeNode("Root");
        DefaultMutableTreeNode subroot = new DefaultMutableTreeNode("SubRoot");
        DefaultMutableTreeNode leaf1 = new DefaultMutableTreeNode("Leaf 1");
        DefaultMutableTreeNode leaf2 = new DefaultMutableTreeNode("Leaf 2");

        treeModel = new DefaultTreeModel(root);
        tree = new JTree(treeModel);

        treeModel.insertNodeInto(subroot, root, 0);
        subroot.add(leaf1);
        root.add(leaf2);

        tree.putClientProperty("JTree.lineStyle", "Angled");
        getContentPane().add(tree, BorderLayout.CENTER);
    }

    public static void main(String args[]) {
        MainClass tt = new MainClass();
        tt.init();
        tt.setVisible(true);
    }
}