JTree 默认展开

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); }}

 

在调用此方法

expandAll(tree, new TreePath(root), true);