Question

这是我的桌面应用程序登录页面的代码。在这个动作列表器中的if条件不能正常工作。它总是显示错误的密码

    final String n1 = textField.getText();      
    lblJph.setFont(new Font("Times New Roman", Font.BOLD | Font.ITALIC, 34));       
    JLabel lblNewLabel = new JLabel("User Name");       
    lblNewLabel.setAlignmentX(Component.RIGHT_ALIGNMENT);       
    passwordField = new JPasswordField();       
    final String pass = passwordField.getText();    

    //final char[] n3 = passwordField.getPassword();
    //final char[] n2 = {'a','d','m','i','n'};
    //final boolean check = n3.equals(n2);

    JLabel lblNewLabel_1 = new JLabel("Password");      
    JLabel label = new JLabel("");      
    JButton btnNewButton = new JButton("Submit");       

    btnNewButton.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent arg0) {             
            if(n1.equals("admin") &&  pass.equals("sales")){                    
            SALES j=new SALES();                
            j.setVisible(true);
            dispose();              
            } else {
            JOptionPane.showMessageDialog(null,"Wrong Password / Username");
            textField.setText("");
            passwordField.setText("");
            textField.requestFocus();
            }
        }
    });

Answer 1

在actionListener中调用{/ 1}} 。 pass永远不会获得更新的值

同样适用于n1

Answer 2

我认为您需要阅读actionlistener

中的密码字段和用户名字段

btnNewButton.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent arg0) {
        String n1 = textField.getText();
        String pass = passwordField.getText();

        if(n1.equals("admin") &&  pass.equals("sales")){

        SALES j=new SALES();

        j.setVisible(true);
        dispose();

        }
        else {

        JOptionPane.showMessageDialog(null,"Wrong Password / Username");
        textField.setText("");
        passwordField.setText("");
        textField.requestFocus();
        }

    }
});

Answer 3

尝试以下方式从密码字段 INSIDE THE ACTION LISTENER 中检索密码：

char pas[]=passwd.getPassword();
String pass=new String(pas);

然后检查

pass.equals("sales");

如果条件在jframe中不起作用

3 个答案: