使用自定义cellFactory确定项目如何在中显示TreeView：
treeView.setCellFactory(new Callback<TreeView<File>, TreeCell<File>>() {
public TreeCell<File> call(TreeView<File> tv) {
return new TreeCell<File>() {
@Override
protected void updateItem(File item, boolean empty) {
super.updateItem(item, empty);
setText((empty || item == null) ? "" : item.getName());
}
};
}
});
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