JAVA GUI：有人可以帮我检查一下为什么我的按钮没有响应吗？

Question

我是 JAVA GUI 的新手，我刚刚开始学习，我开始编写这个简单的身份验证框，但我不确定为什么我的 "fogotpassword" 按钮没有响应"else if (event.getSource()==forgotpassword)" 在方法 thehandler 中。单击它时没有任何反应。它下面的System.out.println("s")不打印。

非常感谢您的帮助:)。祝你有个美好的一天。

public class miniProject extends JFrame
{
    private JTextField UsernameBox;
    private JPasswordField passwordField;
    private JButton forgotpassword;
    private JButton buttonLogin; 

public miniProject()
{
    super("Login Page");
    setLayout(new GridLayout(3, 2,5,10));
    setComponentOrientation(ComponentOrientation.LEFT_TO_RIGHT);

    JLabel username = new JLabel("                          Username:");
    //username.setEditable(false);
    add(username);

    UsernameBox = new JTextField(10);
    add(UsernameBox);

    //item3.setEditable(false);
    JLabel passowrd = new JLabel("                          Password:");
    add(passowrd);

    passwordField = new JPasswordField(10);
    add(passwordField);

    buttonLogin = new JButton("Login");
    add(buttonLogin);

    forgotpassword = new JButton("Forgot My Password");
    add(forgotpassword);

    thehandler handler = new thehandler();
    UsernameBox.addActionListener(handler);
    passwordField.addActionListener(handler);
    buttonLogin.addActionListener(handler);
    forgotpassword.addActionListener(handler);
}

private class thehandler implements ActionListener
{
    int i =5;
    public void actionPerformed(ActionEvent event)
    {
        String string = "";
        if (event.getSource()== passwordField || event.getSource()== UsernameBox ||event.getSource()==buttonLogin)
        {
            String password="";
            if(passwordField.getPassword().length != 0 && UsernameBox.getText().length()!=0 )
            {
                for (char a :passwordField.getPassword())
                {
                    password +=a;
                }
                password = password.trim();
                if (password.equals("kyle") && UsernameBox.getText().equals("marcus"))
                {
                    string = String.format("Welcome Back!", event.getActionCommand());
                    JOptionPane.showMessageDialog(null, string);
                }
                else 
                {
                    string = String.format("Incorrect Password\n "+i+" more attempts remaining until your account is locked", event.getActionCommand());
                    JOptionPane.showMessageDialog(null, string);
                    i--;
                }
            }
            else if (event.getSource()==forgotpassword)
            {
                System.out.println("s");
                String input = JOptionPane.showInputDialog("Enter your email");
                if (input.length()!=0)
                {
                    JOptionPane.showInternalMessageDialog(null, "Check your email to reset password!", "Password Reset",JOptionPane.PLAIN_MESSAGE);
                }
            }
            else if (passwordField.getPassword().length == 0)
            {
                string = String.format("You didn't enter your password!",event.getActionCommand());
                JOptionPane.showMessageDialog(null, string);
            }
            else if (UsernameBox.getText().length()==0)
            {
                string = String.format("You didn't enter your username!",event.getActionCommand());
                JOptionPane.showMessageDialog(null, string);
            }
        }
    }
}

}

Answer 1

代码似乎没有按预期工作，因为 actionPerformed 方法第二行中的 if 不包含检查忘记密码按钮是否为事件源的条件。您必须将此检查添加到外部 if 或将 else if (event.getSource()==forgotpassword) 移到该外部 if.

之外

JAVA GUI：有人可以帮我检查一下为什么我的按钮没有响应吗？

JAVA GUI: Can someone help me check why my button doesn't respond to it being clicked?

java

user-interface

swing

awt