Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.awt.Component;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.ToolTipManager;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeCellRenderer;
import javax.swing.tree.DefaultTreeModel;

public class Main {
    public static void main(String[] args) {
        DefaultMutableTreeNode root = new DefaultMutableTreeNode("Days");
        for (DaysOfTheWeek dotw : DaysOfTheWeek.values()) {
            root.add(new DefaultMutableTreeNode(dotw));
        }
        final DefaultTreeModel model = new DefaultTreeModel(root);
        JTree tree = new JTree(model);
        tree.setRootVisible(true);
        tree.setShowsRootHandles(true);
        ToolTipManager.sharedInstance().registerComponent(tree);
        tree.setCellRenderer(new MyTreeCellRenderer());
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.add(new JScrollPane(tree));
        f.pack();
        f.setVisible(true);
    }

}

enum DaysOfTheWeek {
    MONDAY("Monday", "MON", "First day of the work week."), TUESDAY("Tuesday", "TUE",
            "Second day of the work week");

    private final String fullName;
    private final String abbrvName;
    private final String description;

    private DaysOfTheWeek(String fullName, String abbrvName, String description) {
        this.fullName = fullName;
        this.abbrvName = abbrvName;
        this.description = description;
    }

    public String getFullName() {
        return fullName;
    }

    public String getAbbrvName() {
        return abbrvName;
    }

    public String getDescription() {
        return description;
    }
}

class MyTreeCellRenderer extends DefaultTreeCellRenderer {

    @Override
    public Component getTreeCellRendererComponent(JTree tree, Object value, boolean sel, boolean expanded,
            boolean leaf, int row, boolean hasFocus) {
        Component cell = super.getTreeCellRendererComponent(tree, value, sel, expanded, leaf, row, hasFocus);
        if (value instanceof DefaultMutableTreeNode
                && ((DefaultMutableTreeNode) value).getUserObject() instanceof DaysOfTheWeek) {
            ((JLabel) cell)
                    .setText(((DaysOfTheWeek) ((DefaultMutableTreeNode) value).getUserObject()).getFullName());
        }
        return cell;
    }
}