TreeCellRendererImplementation.java Source code

Introduction

Here is the source code for TreeCellRendererImplementation.java

Source

import java.awt.BorderLayout;
import java.awt.Component;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreeCellRenderer;
import javax.swing.tree.TreeModel;

public class TreeCellRendererImplementation extends JFrame {

    public TreeCellRendererImplementation() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        DefaultMutableTreeNode root = new DefaultMutableTreeNode("+");
        root.add(new DefaultMutableTreeNode(new Integer(3)));
        DefaultMutableTreeNode node = new DefaultMutableTreeNode("*");
        node.add(new DefaultMutableTreeNode("string"));
        node.add(new DefaultMutableTreeNode(new Short((short) 5)));
        root.add(node);

        TreeModel tm = new DefaultTreeModel(root);
        JTree tree = new JTree(tm);
        tree.setShowsRootHandles(true);
        tree.setCellRenderer(new MyRenderer());
        getContentPane().add(tree, BorderLayout.CENTER);
        setSize(400, 300);
        setVisible(true);
    }

    private class MyRenderer extends JLabel implements TreeCellRenderer {
        public Component getTreeCellRendererComponent(JTree tree, Object value, boolean isSelected,
                boolean isExpanded, boolean isLeaf, int row, boolean hasFocus) {
            Object userObject = ((DefaultMutableTreeNode) value).getUserObject();
            setText(value.toString() + " [" + userObject.getClass().getName() + "]");
            return this;
        }
    }

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