List elements = dataBox.getSelectionModel().getAllSelectedElement(); 为空

if(i == 5) {
        facemenuItem.setText("E 面");
        facemenuItem.setName(i + "");
      }
      if(i == 6) {
        facemenuItem.setText("F 面");
        facemenuItem.setName(i + "");
      }
      menus[i - 1] = facemenuItem;

      facemenuItem.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
          List elements = dataBox.getSelectionModel().getAllSelectedElement();
          if(elements.size() == 1) {
            int currentFaceIndex = Integer.parseInt(((JMenuItem)e.getSource()).getName());
            faceMenu.setCurrentFaceIndex(currentFaceIndex);
            Element element = ((Element)elements.get(0));
            element.putClientProperty(EquipmentAppletConstant.TAG_FACEINDEX, currentFaceIndex);
            faceButton.setText(getLabelForFace(currentFaceIndex) + ":" + getLabelForFace(faceMenu.getFaceCount()) + " ");
            EquipmentLocationUtil.changeVisibleByFace(element, currentFaceIndex);
          }
        }
      });
    } twaver --------------------编程问答--------------------   List elements = dataBox.getSelectionModel().getAllSelectedElement();
为什么没有值 --------------------编程问答-------------------- 那得看你dataBox.getSelectionModel().getAllSelectedElement()的业务逻辑啊，
不然天知道。。。 --------------------编程问答-------------------- 跟代码跟进去，看看做了什么处理。 --------------------编程问答-------------------- 那是封装的，我看不到

--------------------编程问答-------------------- TDataBox dataBox;
dataBox.getSelectionModel().getAllSelectedElement() 就是看不到他里面的东西，这是twaver 封装的TDataBox
主要是点击切换面，拼装
int currentFaceIndex = Integer.parseInt(((JMenuItem)e.getSource()).getName());、//获取I的值 i=1 就是A 以此类推到F     getLabelForFace这是方法
            faceMenu.setCurrentFaceIndex(currentFaceIndex);
            Element element = ((Element)elements.get(0));
            element.putClientProperty(EquipmentAppletConstant.TAG_FACEINDEX, currentFaceIndex);
            faceButton.setText(getLabelForFace(currentFaceIndex) + ":" + getLabelForFace(faceMenu.getFaceCount()) + " ");//拼装
            EquipmentLocationUtil.changeVisibleByFace(element, currentFaceIndex);

补充：Java ,  Java SE