Question

当我跑步时，我无法在框架中看到我的JMenu，我该怎么办？

我删除了之前的面板，然后我只想把它放在我的框架中

package app.ui;

import java.awt.Color;
import java.awt.Font;

import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
 import javax.swing.JSeparator;
 import javax.swing.WindowConstants;

 import app.model.User;
 import app.util.JMenusss;



 import java.awt.event.MouseAdapter;
 import java.awt.event.MouseEvent;
 import java.awt.event.MouseMotionAdapter;

 public class JMenus {
private JFrame menuu;
private SecurityQuestion securityQuestion;
private User user;

private JMenu mnAccount;

public JMenus(JFrame menuu) {
    this.menuu = menuu;
    initialize();
}

/**
 * Initialize the contents of the frame.
 */
private void initialize() {



    final JLabel lblHome = new JLabel("");
    lblHome.addMouseListener(new MouseAdapter() {
        @Override
        public void mouseReleased(MouseEvent arg0) {
            Welcome myWelcome = new Welcome();
            menuu.dispose();
        }
    });
    lblHome.setIcon(new ImageIcon(JMenus.class.getResource("/app/resources/home-icon.png")));
    lblHome.setBounds(780, 4, 88, 83);
    menuu.getContentPane().add(lblHome);

    final JLabel lblItem = new JLabel("");
    lblItem.addMouseListener(new MouseAdapter() {
        @Override
        public void mouseReleased(MouseEvent arg0) {
            ItemManagement myItemManagement = new ItemManagement();
            myItemManagement.ItemManagement();
            menuu.dispose();
        }
    });
    lblItem.setIcon(new ImageIcon(JMenus.class.getResource("/app/resources/items.png")));
    lblItem.setBounds(860, 4, 88, 83);
    menuu.getContentPane().add(lblItem);

    final JLabel lblGroupManagement = new JLabel("");
    lblGroupManagement.setIcon(new ImageIcon(JMenus.class.getResource("/app/resources/group11.png")));
    lblGroupManagement.setBounds(940, 4, 88, 83);
    menuu.getContentPane().add(lblGroupManagement);

    lblGroupManagement.addMouseListener(new MouseAdapter() {
        @Override
        public void mouseReleased(MouseEvent e) {
            GroupManagement myGroupManagement = new GroupManagement();
            myGroupManagement.groupManagement();

            menuu.dispose();
        }
    });


    final JLabel lblInventory = new JLabel("");
    lblInventory.addMouseListener(new MouseAdapter() {
        @Override
        public void mouseReleased(MouseEvent e) {
            IOStock myInventory = new IOStock();
            myInventory.InventoryWindow();
            menuu.dispose();
        }
    });
    lblInventory.setIcon(new ImageIcon(JMenus.class.getResource("/app/resources/IO.png")));
    lblInventory.setBounds(1020, 4, 88, 83);
    menuu.getContentPane().add(lblInventory);

    final JLabel lblLogout = new JLabel("");
    lblLogout.setIcon(new ImageIcon(JMenus.class.getResource("/app/resources/lock.png")));
    lblLogout.setBounds(1100, 4, 120, 83);
    menuu.getContentPane().add(lblLogout);
    lblLogout.addMouseListener(new MouseAdapter() {
        @Override
        public void mouseReleased(MouseEvent e) {

            int selectedOption = JOptionPane.showConfirmDialog(null,"You are about to logout, are you sure?","Choose",JOptionPane.YES_NO_OPTION); 
            if (selectedOption == JOptionPane.YES_OPTION) {
                Login window = new Login();
                window.frmLogin.setVisible(true);
                menuu.dispose();
            }
        }

    });

这是我的JMenu

    JMenuBar mnbMenu = new JMenuBar();
    mnbMenu.setBackground(Color.WHITE);
    mnbMenu.setBounds(100, 4, 80, 89);
    menuu.getContentPane().add(mnbMenu);

    mnAccount = new JMenu();
    mnAccount.setBackground(Color.WHITE);
    mnAccount.setForeground(Color.WHITE);
    mnAccount.setIcon(new ImageIcon("/app/resources/Settings-icon.png"));
    mnAccount.setBounds(1180, 4, 100, 100);
    mnbMenu.add(mnAccount);



    JMenuItem mntmChangeUsername = new JMenuItem("Change Username");
    mntmChangeUsername.addMouseListener(new MouseAdapter() {
        @Override
        public void mouseReleased(MouseEvent arg0) {
            UpdateUserName updateUsername = new UpdateUserName(user);
            updateUsername.setVisible(true);


        }
    });

    //mntmChangeUsername.setBackground(Color.WHITE);
    mnAccount.add(mntmChangeUsername);

    JMenuItem mntmChangePassword = new JMenuItem("Change Password");
    mntmChangePassword.addMouseListener(new MouseAdapter() {
        @Override
        public void mouseReleased(MouseEvent arg0) {
            ChangeUsername changeUsername = new ChangeUsername(menuu);
            changeUsername.changeAcc();

        }
    });
    mntmChangePassword.setBackground(Color.WHITE);
    mnAccount.add(mntmChangePassword);

    JMenuItem mntmChangeSecurityQuestion = new JMenuItem("Change Security Question");
    mntmChangeSecurityQuestion.addMouseListener(new MouseAdapter() {
        @Override
        public void mouseReleased(MouseEvent arg0) {
            ChangeSecurityQuestion changeSecurity = new ChangeSecurityQuestion(user, securityQuestion);
            changeSecurity.setVisible(true);
            changeSecurity.setLocationRelativeTo(null);
            changeSecurity.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
            changeSecurity.setAlwaysOnTop(true);

        }
    });
    mntmChangeSecurityQuestion.setBackground(Color.WHITE);
    mnAccount.add(mntmChangeSecurityQuestion);






}

}

这是我的代码...... 我想在我的Frame上添加JMenu，但它不可见，为什么？

Answer 1

下面：

JMenuBar mnbMenu = new JMenuBar();
...
menuu.getContentPane().add(mnbMenu);

将菜单栏设置为JFrame的正确方法是通过setJMenuBar()方法：

JMenuBar mnbMenu = new JMenuBar();
...
menuu.setJMenuBar(mnbMenu);

查看How to Use Menus教程。另外，您可能希望看到此主题Why JMenuBar is not place in the JFrame content pane(...)

旁注

查看所有 @ AndrewThompson的提示：

MCTaRE（最小完整测试和可读示例）
这些代码段中没有任何地方是对方法setJMenuBar
不要在菜单中添加鼠标监听器。改为添加ActionListener或Action。
要组织强大的GUI组件，而是使用布局管理器或combinations of them，以及布局填充＆amp; white space的边框。

JMenu不会出现在我的jFrame中

1 个答案:

旁注