How to remove grandchild from JTree?

Question

My current JTree is set up as follows

• Root
• Child 1
  • Grandchild 1.1
  • Grandchild 1.2
• Child 2
  • Grandchild 2.1
  • Grandchild 2.2

Question is, how can I remove any of the selected Grandchild? When I tried root.removeNodeFromParent(...), it seems like it only works for Child 1 and Child 2 and not the Grandchild.

DefaultTreeModel model = (DefaultTreeModel) workspaceTree.getModel();
DefaultMutableTreeNode root = (DefaultMutableTreeNode) model.getRoot();
DefaultMutableTreeNode child = (DefaultMutableTreeNode) root.getChildAt(0);
child.remove(new DefaultMutableTreeNode("Grandchild 1.1"));
model.reload(root);

I'm having this error saying Argument as a child

Answer 1

Use DefaultTreeModel.removeNodeFromParent()

public void removeNodeFromParent(MutableTreeNode node)

Message this to remove node from its parent. This will message nodesWereRemoved to create the appropriate event. This is the preferred way to remove a node as it handles the event creation for you.

For example :

DefaultMutableTreeNode grandChild = (DefaultMutableTreeNode) child.getChildAt(0);
model.removeNodeFromParent(grandChild);
// no need to reload the root