在 Java GUI 中更新 JTree
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updating JTree in java GUI
提问by sajad
I used a JTree in my GUI and added it to a JFrame. When I want to update it and change it's nodes in another part of my program (while program is running, as an action performed) I try to add new nodes, or remove nodes to it; But my interface doesn't change. Please suggest me a solution.
我在 GUI 中使用了 JTree 并将其添加到 JFrame。当我想更新它并在我的程序的另一部分更改它的节点时（在程序运行时，作为执行的操作），我尝试添加新节点或删除节点；但是我的界面没有改变。请建议我一个解决方案。
regards
问候
回答by camickr
In addition to the insertNodeInto suggestion you can also use:
除了 insertNodeInto 建议，您还可以使用：
DefaultTreeModel model = (DefaultTreeModel)tree.getModel();
DefaultMutableTreeNode root = (DefaultMutableTreeNode)model.getRoot();
root.add(new DefaultMutableTreeNode("another_child"));
model.reload(root);
回答by Adamski
You need to ensure that after updating your model you instruct it to fire an event to cause any registered listeners to be notified of the event. One of the listeners will be the JTreeand upon receiving the event it will repaint.
您需要确保在更新您的模型后，您指示它触发一个事件，以使任何注册的侦听器都收到该事件的通知。其中一个侦听器将是JTree并且在接收到事件后它将重新绘制。
For example, DefaultTreeModelcontains the methods:
例如，DefaultTreeModel包含方法：
nodeChangednodesChangednodeStructureChangednodesWereInsertednodesWereRemoved
nodeChangednodesChangednodeStructureChangednodesWereInsertednodesWereRemoved
Also, as with all Swing programming you need to ensure you are updating your model on the Event Dispatch Thread.
此外，与所有 Swing 编程一样，您需要确保在Event Dispatch Thread上更新模型。
