Question

我想知道我是否可以将变量 user2 和 pass2（它们都位于类 showWindow() 的 Register 方法中）用于 {{1} showWindow() 类中的 }} 方法，以便在 LoginDemo 类中输入的用户名和密码将与 Register 类中的输入相匹配。

LoginDemo

public class LoginDemo 

    public static void showWindow() {
        JPanel panel = new JPanel();
        JFrame frame = new JFrame("Log in/Sign up ");
        frame.setSize(300, 180);
        frame.setLocationRelativeTo(null);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(panel);

        panel.setLayout(null);

        userLabel = new JLabel("USERNAME");
        userLabel.setBounds(10, 10, 80, 25);
        panel.add(userLabel);

        userText = new JTextField(20);
        userText.setBounds(100, 10, 160, 25);
        panel.add(userText);

        passwordLabel = new JLabel("PASSWORD");
        passwordLabel.setBounds(10, 40, 80, 25);
        panel.add(passwordLabel);

        passwordText = new JPasswordField(20);
        passwordText.setBounds(100, 40, 160, 25);
        panel.add(passwordText);

        button = new JButton("LOG-IN");
        button.setBounds(10, 80, 80, 25);
        button.addActionListener(new LoginDemo());
        panel.add(button);

        success = new JLabel("");
        success.setBounds(10, 110, 300, 25);
        panel.add(success);

        JButton registerButton = new JButton("CREATE ACCOUNT");
        registerButton.setBounds(130, 80, 150, 25);
        panel.add(registerButton);
        registerButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                frame.setVisible(false);
                Register w2 = new Register();
                w2.showWindow();
            }
        });

        frame.setVisible(true);
    }

    public void actionPerformed(ActionEvent e){

        Register w2 = new Register();

        String user = userText.getText();
        String password = passwordText.getText();


        if(user.equals(w2.user2) && password.equals(w2.pass2))
        {
            JOptionPane.showMessageDialog(null,"Log in Successful!");
        }
        else
        {

            JOptionPane.showMessageDialog(null,"Invalid Login Details" + " \nLogin Error ");
        }

    }
}

Answer 1

你可以通过 Login 类的构造函数传递它。向登录类添加构造函数。

public class LoginDemo {
   private String user2, pass2;
   public LoginDemo(String user2, String pass2) {
       this.user2 = user2;
       this.pass2 = pass2;
   }

现在在您的注册类中传递值

LoginDemo w1 = new LoginDemo(user2, pass2);

在注册类中，您可以通过 this.user2 和 this.pass2

访问它

如何在不同类的另一种方法中使用一种方法的变量？

1 个答案: