java 更改 jtree 节点文本运行时
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change the jtree node text runtime
提问by adesh singh
I am trying to create a JTree in java swing now i want to change the node text at runtime
我正在尝试在 java swing 中创建一个 JTree 现在我想在运行时更改节点文本
try
{
int a=1,b=2,c=3;
DefaultMutableTreeNode root =
new DefaultMutableTreeNode("A"+a);
DefaultMutableTreeNode child[]=new DefaultMutableTreeNode[1];
DefaultMutableTreeNode grandChild[]= new DefaultMutableTreeNode[1];
child[0] = new DefaultMutableTreeNode("Central Excise"+b);
grandChild[0]=new DefaultMutableTreeNode("CE Acts: "+c);
child[0].add(grandChild[0]);
root.add(child[0]);
tree = new JTree(root);
}
catch(Exception ex)
{
ex.printStackTrace()
}
Now i want later on how can i change A 1 to a 2 dynamically and similarly in child and grand child nodes
现在我想稍后我如何在子节点和大子节点中动态地和类似地将 A 1 更改为 2
回答by Guillaume Polet
You are looking for javax.swing.tree.DefaultMutableTreeNode.setUserObject(Object)
你正在寻找 javax.swing.tree.DefaultMutableTreeNode.setUserObject(Object)
DefaultTreeModel model = (DefaultTreeModel) tree.getModel();
DefaultMutableTreeNode root = (DefaultMutableTreeNode) model.getRoot();
root.setUserObject("My label");
model.nodeChanged(root);
This assumes that you are using the DefautltTreeModel.
这假设您正在使用DefautltTreeModel.
回答by rimero
If you're not using a custom TreeModel, then the model of your tree is a DefaultTreeModel.
如果您没有使用自定义 TreeModel，那么您的树模型是DefaultTreeModel。
You'll need to walk the tree with some kind of comparator, given your DefaultMutableTreeNodegetUserObject()(string or whatever) to achieve what you want.
考虑到您的 DefaultMutableTreeNode getUserObject()（字符串或其他），您需要使用某种比较器遍历树来实现您想要的。
You have 2 simpleoptions accordingly to your question and the code that you pasted :
根据您的问题和粘贴的代码，您有 2 个简单的选项：
- If your change is triggered by let's say a click event, you can get the selection and walk the tree from there.
- Otherwise you'll need to walk the tree from the root
- 如果您的更改是由点击事件触发的，您可以获得选择并从那里遍历树。
- 否则你需要从根部开始走树
Upon successful changes, you'll need to fire events from the model that will trigger later a repaint of the view (nodesWereInserted, etc.).
成功更改后，您需要从模型中触发事件，这些事件将在稍后触发视图的重绘（nodesWereInserted等）。
Hope it helps
希望能帮助到你
