Java [unchecked]未检查的大小写警告

Integer result = chooser.showOpenDialog(null);
if (result.equals(0))
{
    String tempHolder = chooser.getSelectedFile().getPath();
    filenameLoad = new File(tempHolder);
    filenameSave = filenameLoad;
    FileInputStream fis = null;
    ObjectInputStream in = null;
    try
    {
        fis = new FileInputStream(filenameLoad);
        in = new ObjectInputStream(fis);;
    }
    catch(IOException ex)
    {
        ex.printStackTrace();
    }

    try
    {
        loadFile = (ArrayList<Dot>)in.readObject();
    }
    catch(IOException ex)
    {
        System.out.println(\"Cast fail\");
    }
    catch(ClassNotFoundException ex)
    {
        System.out.println(\"Cast fail\");
    }
    catch (ClassCastException ex)
    {
        System.out.println(\"Cast fail\");
    }

    try
    {
        in.close();
    }
    catch(Exception ex)
    {
        System.out.println(\"failed to close in\");
    }
    save.setEnabled(true);
      gpanel.setDotList(loadFile);
  }