TreePanel.java 文件源码

private void expandAll(JTree tree, TreePath path, boolean expand) {
    TreeNode node = (TreeNode) path.getLastPathComponent();

    if (node.getChildCount() >= 0) {
        Enumeration enumeration = node.children();
        while (enumeration.hasMoreElements()) {
            TreeNode n = (TreeNode) enumeration.nextElement();
            TreePath p = path.pathByAddingChild(n);

            expandAll(tree, p, expand);
        }
    }

    if (expand) {
        tree.expandPath(path);
    } else {
        tree.collapsePath(path);
    }
}