David p's List: java

• public DefaultMutableTreeNode addObject(DefaultMutableTreeNode parent,  Object child,  boolean shouldBeVisible) {  DefaultMutableTreeNode childNode =  new DefaultMutableTreeNode(child);  ...  treeModel.insertNodeInto(childNode, parent,  parent.getChildCount());   //Make sure the user can see the lovely new node.  if (shouldBeVisible) {  tree.scrollPathToVisible(new TreePath(childNode.getPath()));  }  return childNode; }
• Note that although DefaultMutableTreeNode has methods for changing a node's content, changes should go through the DefaultTreeModel cover methods. Otherwise, the tree model events would not be generated, and listeners such as the tree would not know about the updates.
• public DefaultMutableTreeNode addObject(Object child) {  DefaultMutableTreeNode parentNode = null;  TreePath parentPath = tree.getSelectionPath();   if (parentPath == null) {  //There is no selection. Default to the root node.  parentNode = rootNode;  } else {  parentNode = (DefaultMutableTreeNode)  (parentPath.getLastPathComponent());  }   return addObject(parentNode, child, true); }
• public DefaultMutableTreeNode addObject(DefaultMutableTreeNode parent,  Object child,  boolean shouldBeVisible) {  DefaultMutableTreeNode childNode =  new DefaultMutableTreeNode(child);  ...  treeModel.insertNodeInto(childNode, parent,  parent.getChildCount());   //Make sure the user can see the lovely new node.  if (shouldBeVisible) {  tree.scrollPathToVisible(new TreePath(childNode.getPath()));  }  return childNode; }

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