Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.awt.BorderLayout;
import java.awt.Container;

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;

public class Main extends JFrame {
    public static void main(String[] args) {
        new Main();
    }

    public Main() {
        Container content = getContentPane();
        Object[] hierarchy = { "javax.swing", "javax.swing.border", "javax.swing.colorchooser", "javax.swing.event",
                "javax.swing.filechooser",
                new Object[] { "javax.swing.plaf", "javax.swing.plaf.basic", "javax.swing.plaf.metal",
                        "javax.swing.plaf.multi" },
                "javax.swing.table",
                new Object[] { "javax.swing.text",
                        new Object[] { "javax.swing.text.html", "javax.swing.text.html.parser" },
                        "javax.swing.text.rtf" },
                "javax.swing.tree", "javax.swing.undo" };
        DefaultMutableTreeNode root = processHierarchy(hierarchy);
        JTree tree = new JTree(root);
        content.add(new JScrollPane(tree), BorderLayout.CENTER);
        setSize(275, 300);
        setVisible(true);
    }

    private DefaultMutableTreeNode processHierarchy(Object[] hierarchy) {
        DefaultMutableTreeNode node = new DefaultMutableTreeNode(hierarchy[0]);
        DefaultMutableTreeNode child;
        for (int i = 1; i < hierarchy.length; i++) {
            Object nodeSpecifier = hierarchy[i];
            if (nodeSpecifier instanceof Object[]) //  node with children
                child = processHierarchy((Object[]) nodeSpecifier);
            else
                child = new DefaultMutableTreeNode(nodeSpecifier); //  Leaf
            node.add(child);
        }
        return (node);
    }
}