我找不到任何直截了当的答案 回答我的问题, 希望你们可以!

我创建了一个类,叫做“Alass”内部的类,是一个动作处理器,它包含一系列对帐单,如果这些对帐单对照数据库核对了输入值。

我想做的是隐藏JFrame Frame, 也就是用Frame. setvisible(false) 来隐藏在星系中创建的JFrame(frame the Frame),

目前版本的代码(见以下不起作用的文本):

public class aClass{
static JTextField USER_NAME;
static JPasswordField PASSWORD;
static JButton submit;

private static class Handler implements ActionListener {
    @Override

    public void actionPerformed(ActionEvent e) {
        String USER_NAME_I = USER_NAME.getText();   
        String PASSWORD_I = PASSWORD.getText();   

        try {
           Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
        } catch (ClassNotFoundException ex) {
            Logger.getLogger(aClass.class.getName()).log(Level.SEVERE, null, ex);
        }
        try {
            Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/fake",
             /*DB USER_NAME*/       "fakeuname", 
             /*DB password*/       "fakepassword");              

            Statement st = con.createStatement();
            String FindQuery = "SELECT acc_pass FROM users where acc_name= "+USER_NAME_I+" ";      

            //System.out.println(FindQuery);                        

            ResultSet rs = st.executeQuery(FindQuery);              

            if(rs.next())                                           
            {
                String PASSWORD_DB = rs.getString(1);                   

                if(PASSWORD_DB.equals(PASSWORD_I))                         
                {   
                    //THIS WILL NOT WORK
                    loginFrame.setVisible(false);


                    //do something       
                }

                else                                                
                {
                    JOptionPane.showMessageDialog(null,
                            "Wrong Password",
                            "Error",1);
                }//end else

           }//end if (rs.next())
            else                                                    
            {
                JOptionPane.showMessageDialog(null,
                        "Wrong Username",
                        "Error",1);
            }//end else

        } catch (SQLException ex) 
        {
            Logger.getLogger(aClass.class.getName()).log(Level.SEVERE, null, ex);
        }//end catch (SQLException ex)
    }//end ActionEvent
}//end ActionListener


aClass(){                                                   

    JFrame loginFrame = new JFrame("Logon");                        
    loginFrame.setVisible(true);                                    
    loginFrame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);   

    USER_NAME = new JTextField(10);                                     
    PASSWORD = new JPasswordField(10);                                 
    loginFrame.setLayout(new GridLayout(0,1));

    JPanel loginPanel = new JPanel();                               
    loginFrame.add(loginPanel);

    loginPanel.add(new JLabel("User Name: "));                       
    loginPanel.add(USER_NAME);                                          
    loginPanel.add(new JLabel("Password: "));                      
    loginPanel.add(PASSWORD);                                         

    submit = new JButton("Submit");                                 
    loginPanel.add(submit);                                         
    submit.addActionListener(new Handler());                        

 }//end aClass

public static void main(String args[])
{
    new aClass();                           
}//end main
}//end class

EDIT: My knowledge on the subject is limited, the code above is an edited version of an online tutorial I found. I ll fiddle some and see if I can get it to worki with JOptionPane and edit again if i need any help!