java:cannot resolve symbol

public class BookInfoF extends JFrame implements ActionListener
{ private JFrame frame;
private Statement stmt;
private Connection con;
private JButton btn,btn1;
private JRadioButton rbtn1,rbtn2;
private JComboBox jcb1,jcb2;
private JLabel lb1,lb2;
private JTextField jtfd1,jtfd2;
private BookInfomationF bookI;
public BookInfoF(BookInfomationF bookI)
{
frame=new JFrame("图书信息查询");
ImageIcon icon=new ImageIcon("images/home.gif");
frame.setIconImage(icon.getImage());
frame.setResizable(false);
Font font1=new Font("宋体",Font.PLAIN,13);
Container content=frame.getContentPane();
this.bookI=bookI;
......
后面省略

编译时候有如下问题：
F:\library\BookInfoF.java:19: cannot resolve symbol
symbol : class BookInfomationF
location: class BookInfoF
private BookInfomationF bookI;
^
F:\library\BookInfoF.java:20: cannot resolve symbol
symbol : class BookInfomationF
location: class BookInfoF
public BookInfoF(BookInfomationF bookI)
^

即这2行有问题：
private BookInfomationF bookI;
public BookInfoF(BookInfomationF bookI)

请问是什么意思?

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BookInfomationF
这个类不能识别，应该是没有引用。添加引用即可

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