java Swing 之jtree 实现全部展开 或关闭

/**
* 展开一棵树
*
* @param tree
*/
private void expandTree(JTree tree) {
TreeNode node = (TreeNode) tree.getModel().getRoot();
expandAll(tree, new TreePath(node), true);
}

/**
* 完全展开一棵树或关闭一棵树
*
* @param tree
*            JTree
* @param parent
*            父节点
* @param expand
*            true 表示展开，false 表示关闭
*/
private void expandAll(JTree tree, TreePath parent, boolean expand) {
TreeNode node = (TreeNode) parent.getLastPathComponent();

if (node.getChildCount() > 0) {
for (Enumeration e = node.children(); e.hasMoreElements();) {
TreeNode n = (TreeNode) e.nextElement();
TreePath path = parent.pathByAddingChild(n);
expandAll(tree, path, expand);

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