Java JTree只扩展一级节点 [英] Java JTree expand only level one nodes

问题描述

使用JTree，假设根节点为0级，并且根目录下可能有多达5个级别，如何轻松扩展所有1级节点，以便所有1级和1级节点都可以。 2个分支和叶子是可见的，但3级和3级以下不是？

With a JTree, assuming the root node is level 0 and there may be up to 5 levels below the root, how can I easily expand all the level 1 nodes so that all level 1 & 2 branches and leafs are visible but levels 3 and below aren't?

推荐答案

感谢快速回复的人。但是我现在找到了我正在寻找的简单解决方案。出于某种原因，我在JavaDocs中看不到DefaultMutableTreeNode.getLevel（）！仅供参考我现在正在做的是：

Thanks for the quick response guys. However I have now found the simple solution I was looking for. For some reason I just couldn't see DefaultMutableTreeNode.getLevel() in the JavaDocs! FYI what I'm doing now is:

    DefaultMutableTreeNode currentNode = treeTop.getNextNode();
    do {
       if (currentNode.getLevel()==1) 
            myTree.expandPath(new TreePath(currentNode.getPath()));
       currentNode = currentNode.getNextNode();
       }
    while (currentNode != null);

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