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();
}
}