Java by API/javax.swing.tree/TreeCellRenderer

implements TreeCellRenderer

   <source lang="java">

import java.awt.BorderLayout; import java.awt.ruponent; import javax.swing.JFrame; 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.TreeCellRenderer; public class MainClass {

 public static void main(final String args[]) {
   JFrame frame = new JFrame("Tree Tips");
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   JTree tree = new JTree(new String[]{"a","b","c"});
   ToolTipManager.sharedInstance().registerComponent(tree);
   TreeCellRenderer renderer = new ToolTipTreeCellRenderer();
   tree.setCellRenderer(renderer);
   JScrollPane scrollPane = new JScrollPane(tree);
   frame.add(scrollPane, BorderLayout.CENTER);
   frame.setSize(300, 150);
   frame.setVisible(true);
 }

} class ToolTipTreeCellRenderer implements TreeCellRenderer {

 DefaultTreeCellRenderer renderer = new DefaultTreeCellRenderer();
 public ToolTipTreeCellRenderer() {
 }
 public Component getTreeCellRendererComponent(JTree tree, Object value, boolean selected,
     boolean expanded, boolean leaf, int row, boolean hasFocus) {
   Object tip = null;
   if (value != null) {
     
     if (value instanceof DefaultMutableTreeNode) {
       tip = ((DefaultMutableTreeNode) value).getUserObject();
     } else {
       tip = tree.convertValueToText(value, selected, expanded, leaf, row, hasFocus);
     }
     renderer.setToolTipText((String)tip);
   }
   renderer.setText((String)tip);
   return renderer;
 }

}

      </source>