1In C# there's TreeView_afterSelect event ，我问在java中是否是这样的？我用过:hierarchyPropertyChange 但它运行了两次......

您可以使用 TreeSelectionListener :

tree.addTreeSelectionListener(new TreeSelectionListener() {

@Override
public void valueChanged(TreeSelectionEvent e) {
   DefaultMutableTreeNode selectedNode =
       (DefaultMutableTreeNode)tree.getLastSelectedPathComponent();
   ...
  }
});