Java多菜单项，带有事件侦听器

Question

我在这里有两个菜单项，一个是用于学生信息，另一个用于老师信息。我添加了学生和老师的菜单。

我在事件中被击中听众如何将操作添加到菜单和菜单1，假设当用户单击菜单1时，则应显示学生信息，而对于菜单2，则应执行教师信息操作。我很困惑在哪里添加操作Listerr并为学生和老师执行操作。

我是java中的事件和动作列表的新手，建议解决方案

import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
import java.sql.*;
public class Searchdb extends JFrame implements ActionListener {
//Initializing Components
    JLabel lb,lbd,lb1, lb2, lb3, lb5;
    JTextField tf1, tf2,tf3,tf5,tfd;
    JButton btn;
 JMenuBar menuBar = new JMenuBar();
    JMenu menu = new JMenu("Student");
    JMenu menu1 = new JMenu("Teacher");
    //Creating Constructor for initializing JFrame components
    Searchdb() {
        //Providing Title
        super("Fetching Roll Information");
        setJMenuBar(menuBar);
        menuBar.add(menu);
        menuBar.add(menu1);

        lb5 = new JLabel("Roll Number:");
        lb5.setBounds(20, 20, 100, 20);
        tf5 = new JTextField(20);
        tf5.setBounds(130, 20, 200, 20);
        lbd = new JLabel("Date:");
        lbd.setBounds(20, 50, 100, 20);
        tfd = new JTextField(20);
        tfd.setBounds(130, 50, 200, 20);

        btn = new JButton("Submit");
        btn.setBounds(50, 50, 100, 20);
        btn.addActionListener(this);
        lb = new JLabel("Fetching Student Information From Database");
        lb.setBounds(30, 80, 450, 30);
        lb.setForeground(Color.black);
        lb.setFont(new Font("Serif", Font.PLAIN, 12));
        setVisible(true);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(500, 500);
        lb1 = new JLabel("Name:");
        lb1.setBounds(20, 120, 100, 20);
        tf1 = new JTextField(50);
        tf1.setBounds(130, 120, 200, 20);
        lb2 = new JLabel("Fathername:");
        lb2.setBounds(20, 150, 100, 20);
        tf2 = new JTextField(100);
        tf2.setBounds(130, 150, 200, 20);
        lb3 = new JLabel("State:");
        lb3.setBounds(20, 180, 100, 20);
        tf3 = new JTextField(50);
        tf3.setBounds(130, 180, 200, 20);
        setLayout(null);
        //Add components to the JFrame
        add(lb5);
        add(tf5);
        add(lbd);
        add(tfd);
        add(btn);
        add(lb);
        add(lb1);
        add(tf1);
        add(lb2);
        add(tf2);
        add(lb3);
        add(tf3);

        //Set TextField Editable False
        tf1.setEditable(false);
        tf2.setEditable(false);
        tf3.setEditable(false);
    }
    public void actionPerformed(ActionEvent e) {
        //Create DataBase Coonection and Fetching Records
        try {
            String str = tf5.getText();
            Datestri = tfd.getText();//Getting the unable to convert String to Date error
            System.out.println(str);
            System.out.println(stri);
            Class.forName("oracle.jdbc.driver.OracleDriver");
            Connection con = DriverManager.getConnection("jdbc:oracle:thin:@//host:port/servicename","username","password");
            PreparedStatement st = con.prepareStatement("select Name,Fathername,State from student_db where roll_number=? and medium=?");
            System.out.println(st);
            st.setString(1, str);
            st.setDate(2, stri);

            //Excuting Query
            ResultSet rs = st.executeQuery();
            System.out.println(rs);
            if (rs.next()) {
                String s = rs.getString(1);
                String s1 = rs.getString(2);
                String s2 = rs.getString(3);

                //Sets Records in TextFields.
                tf1.setText(s);
                tf2.setText(s1);
                tf3.setText(s2);
            } else {
                JOptionPane.showMessageDialog(null, "Student not Found");
            }
            //Create Exception Handler
        } catch (Exception ex) {
            System.out.println(ex);
        }
    }
    public void actionPerformed(ActionEvent e) {
        //Create DataBase Coonection and Fetching Records
        //Teacher information should be retrieved from the db
        }
//Running Constructor
    public static void main(String args[]) {
        new Searchdb();
    }
}

感谢提前的任何帮助。

Answer 1

希望，这将有所帮助

对于jmenu，您可以使用menulistener

class MenuListenerAdapter implements MenuListener {
    @Override
    public void menuSelected(MenuEvent e) {
        System.out.println("Menu Selected");
    }
    @Override
    public void menuDeselected(MenuEvent e) {
        System.out.println("Menu Deselected");
    }
    @Override
    public void menuCanceled(MenuEvent e) {
        System.out.println("Menu Canceled");
    }
}

然后在菜单上添加menulistener

menu.addMenuListener(new MenuListenerAdapter());

Answer 2

您可以使用Mouselistener，在下面找到您的解决方案，单击学生和老师菜单

时查看控制台

import java.awt.Color;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JTextField;
public class Searchdb extends JFrame implements ActionListener {
    //Initializing Components
    JLabel lb, lbd, lb1, lb2, lb3, lb5;
    JTextField tf1, tf2, tf3, tf5, tfd;
    JButton btn;
    JMenuBar menuBar = new JMenuBar();
    JMenu menu = new JMenu("Student");
    JMenu menu1 = new JMenu("Teacher");
    //Creating Constructor for initializing JFrame components
    Searchdb() {
        //Providing Title
        super("Fetching Roll Information");
        setJMenuBar(menuBar);
        menuBar.add(menu);
        menuBar.add(menu1);
        menu.addMouseListener(new MouseListenerForStudentAndTeacher());
        menu1.addMouseListener(new MouseListenerForStudentAndTeacher());
        lb5 = new JLabel("Roll Number:");
        lb5.setBounds(20, 20, 100, 20);
        tf5 = new JTextField(20);
        tf5.setBounds(130, 20, 200, 20);
        lbd = new JLabel("Date:");
        lbd.setBounds(20, 50, 100, 20);
        tfd = new JTextField(20);
        tfd.setBounds(130, 50, 200, 20);
        btn = new JButton("Submit");
        btn.setBounds(50, 50, 100, 20);
        btn.addActionListener(this);
        lb = new JLabel("Fetching Student Information From Database");
        lb.setBounds(30, 80, 450, 30);
        lb.setForeground(Color.black);
        lb.setFont(new Font("Serif", Font.PLAIN, 12));
        setVisible(true);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(500, 500);
        lb1 = new JLabel("Name:");
        lb1.setBounds(20, 120, 100, 20);
        tf1 = new JTextField(50);
        tf1.setBounds(130, 120, 200, 20);
        lb2 = new JLabel("Fathername:");
        lb2.setBounds(20, 150, 100, 20);
        tf2 = new JTextField(100);
        tf2.setBounds(130, 150, 200, 20);
        lb3 = new JLabel("State:");
        lb3.setBounds(20, 180, 100, 20);
        tf3 = new JTextField(50);
        tf3.setBounds(130, 180, 200, 20);
        setLayout(null);
        //Add components to the JFrame
        add(lb5);
        add(tf5);
        add(lbd);
        add(tfd);
        add(btn);
        add(lb);
        add(lb1);
        add(tf1);
        add(lb2);
        add(tf2);
        add(lb3);
        add(tf3);
        //Set TextField Editable False
        tf1.setEditable(false);
        tf2.setEditable(false);
        tf3.setEditable(false);
    }
    public void actionPerformed(ActionEvent e) {
        // removed code, you can add your code later on
    }
    public static void main(String args[]) {
        new Searchdb();
    }
    private class MouseListenerForStudentAndTeacher extends MouseAdapter {
        @Override
        public void mouseClicked(MouseEvent e) {
            if (e.getSource() == menu) {
                System.out.println("Student Menu Clicked");
            }
            if (e.getSource() == menu1) {
                System.out.println("Teacher Menu Clicked");
            }
        }
    }
}