我想链接我的LoginPage登录按钮在Java

Question

我为Base创建了一个JFrame表单，并为页面替换目的创建了JPane l。我已经创建了菜单栏与登录按钮。我在JPanel上创建了LoginPage。

现在我想链接我的LoginPage登录按钮的基础框架。请帮帮我。我试过一个密码。当我点击登录按钮，什么也没发生。

• 登录页面名称:LoginPage.java
• 替换面板:panelWelcomePanel
• 登录按钮名称:menuLogin

代码:

private void menuLoginActionPerformed(java.awt.event.ActionEvent evt) {                                          
        LoginPage login = new LoginPage();
        panelWelcomePanel.removeAll();
        validate();
        panelWelcomePanel.add(login);
        validate();
    } 

登录页面代码:I am using NetBeans.

public class LoginPage extends javax.swing.JPanel {
    /**
     * Creates new form LoginPage
     */
    public LoginPage() {
        initComponents();
    }
    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {
        labeluName = new javax.swing.JLabel();
        labeluPass = new javax.swing.JLabel();
        jTextField1 = new javax.swing.JTextField();
        jPasswordField1 = new javax.swing.JPasswordField();
        btnLogin = new javax.swing.JButton();
        btnReset = new javax.swing.JButton();
        loginBackground = new javax.swing.JLabel();
        setMaximumSize(new java.awt.Dimension(800, 500));
        setMinimumSize(new java.awt.Dimension(800, 500));
        setLayout(null);
        labeluName.setFont(new java.awt.Font("Serif", 3, 24)); // NOI18N
        labeluName.setForeground(new java.awt.Color(204, 204, 255));
        labeluName.setText("UserName :");
        add(labeluName);
        labeluName.setBounds(250, 200, 120, 40);
        labeluPass.setFont(new java.awt.Font("Serif", 3, 24)); // NOI18N
        labeluPass.setForeground(new java.awt.Color(204, 204, 255));
        labeluPass.setText("Password :");
        add(labeluPass);
        labeluPass.setBounds(250, 260, 120, 50);
        add(jTextField1);
        jTextField1.setBounds(390, 200, 200, 30);
        add(jPasswordField1);
        jPasswordField1.setBounds(390, 270, 200, 30);
        btnLogin.setForeground(new java.awt.Color(51, 51, 51));
        btnLogin.setText("Login");
        add(btnLogin);
        btnLogin.setBounds(280, 390, 100, 40);
        btnReset.setForeground(new java.awt.Color(51, 51, 51));
        btnReset.setText("Reset");
        add(btnReset);
        btnReset.setBounds(450, 390, 100, 40);
        loginBackground.setIcon(new javax.swing.ImageIcon("C:\Users\boparai\Desktop\LOGIN.jpg")); // NOI18N
        loginBackground.setMaximumSize(new java.awt.Dimension(800, 500));
        loginBackground.setMinimumSize(new java.awt.Dimension(800, 500));
        loginBackground.setPreferredSize(new java.awt.Dimension(800, 500));
        add(loginBackground);
        loginBackground.setBounds(0, 0, 800, 500);
    }// </editor-fold>                        

    // Variables declaration - do not modify                     
    private javax.swing.JButton btnLogin;
    private javax.swing.JButton btnReset;
    private javax.swing.JPasswordField jPasswordField1;
    private javax.swing.JTextField jTextField1;
    private javax.swing.JLabel labeluName;
    private javax.swing.JLabel labeluPass;
    private javax.swing.JLabel loginBackground;
    // End of variables declaration                   
}

Answer 1

1. 不要使用空布局。始终使用合适的布局管理器。
2. 正如已经建议的，考虑使用CardLayout
3. 当从已经可见的父组件中添加/删除子组件时，在删除/添加子组件的代码之后调用parent#revalidate()和parent#repaint()(按此顺序)