Question

我正在尝试创建一个专业的登录/注册表单，此时我的代码不起作用：它将用于我通过NetBeans创建的FPL论坛。

对此主题的任何帮助将不胜感激。

    package fplforum;

import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;

public class RegistrationForm extends JFrame implements ActionListener {
    public RegistrationPanel panel;
    public JButton submit, cancel;
    public boolean done;
    public Object UITools;

    public RegistrationForm() {
        JPanel main = new JPanel();
        main.setLayout(new BorderLayout());
        main.setBorder(BorderFactory.createEmptyBorder(5, 10, 5, 10));

        JLabel label = new JLabel("Java CoG Kit Registration");
        label.setFont(Font.decode("Arial-bold-18"));
        label.setBorder(BorderFactory.createEmptyBorder(5, 10, 20, 10));

        main.add(label, BorderLayout.NORTH);

        panel = new RegistrationPanel();
        //panel.getReregister().addActionListener(this);
        //main.add(panel, BorderLayout.CENTER);
        setTitle("Java CoG Kit Registration Form");

        JPanel buttons = new JPanel();
        buttons.setLayout(new FlowLayout());

        submit = new JButton("Submit");
        submit.addActionListener(this);
        buttons.add(submit);

        //submit.setEnabled(panel.getReregister().isSelected());

        cancel = new JButton("Cancel");
        cancel.addActionListener(this);
        buttons.add(cancel);

        main.add(buttons, BorderLayout.SOUTH);

        getContentPane().add(main);
    }

        @Override
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == submit) {
            try {
                panel.submit(false);
                JOptionPane.showMessageDialog(this, "Thank you for registering the Java CoG Kit",
                        "Registration successful", JOptionPane.INFORMATION_MESSAGE);
                done();
            }
            catch (IOException e1) {
                JOptionPane.showMessageDialog(this, "Could not submit registration information: "
                        + e.toString(), "Error", JOptionPane.ERROR_MESSAGE);
            }
        }
        else if (e.getSource() == cancel) {
            done();
        }
        else {
            //must be the don't send switch
            submit.setEnabled(panel.getReregister().isSelected());
        }
    }

    private void done() {
        done = true;
        synchronized (this) {
            notify();
        }
    }

    public void run() {
        setSize(500, 380);
        UITools.left(null, this);
        setVisible(true);
        try {
            synchronized (this) {
                while (!done) {
                    wait();
                }
            }
        }
        catch (InterruptedException e) {
            JOptionPane.showMessageDialog(this, "The main thread was interrupted", "Error",
                    JOptionPane.ERROR_MESSAGE);
        }
        setVisible(false);
        dispose();
    }

    public static void main(String[] args) {
        //RegistrationFrame frame = new RegistrationFrame();
        //frame.run();
        //System.exit(0);
    }

    private static class RegistrationPanel {

        public RegistrationPanel() {
        }

        private Object getReregister() {
            throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
        }

        private void submit(boolean b) {
            throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
        }
    }
}

它会编译但没有任何反应，我该如何解决？

Answer 1

如果它编译并执行，那么它可以工作。它不起作用，因为你希望它工作，但它肯定有效。您有一个空的main方法，因此它不会执行任何操作。这是您的主要方法：

public static void main(String[] args) {
    //RegistrationFrame frame = new RegistrationFrame();
    //frame.run();
    //System.exit(0);
}

所有行都已注释掉，因此无法执行任何操作。在行的开头取出//以执行某些操作。此外，据我所知，您没有RegistrationFrame class，您可能希望实例化RegistrationForm。另外，你为什么打电话给System.exit(0)？

FPL论坛申请

1 个答案: