用java语言写一个简易的学生管理系统适配eclipse编译系统 需遵守一下要求 1．带有图形界面2．登录时输入用户密码3能够录入查询 修改删除课程4能够录入 查询 修改 删除学生某个课程的成绩5能够持久化 分列每个class的代码

好的，我可以为您提供一个简单的Java学生管理系统的示例代码，适配Eclipse编译系统。以下是代码：

import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;

import javax.swing.*;
import javax.swing.table.*;

public class StudentManagementSystem extends JFrame implements ActionListener {
    private static final long serialVersionUID = 1L;
    private JLabel lblUser, lblPwd;
    private JTextField txtUser;
    private JPasswordField txtPwd;
    private JButton btnLogin;
    private JTable table;
    private DefaultTableModel model;
    private JScrollPane scrollPane;
    private JComboBox<String> cmbClass;
    private JButton btnAddCourse, btnRemoveCourse, btnAddStudent, btnRemoveStudent, btnUpdateScore;
    private ArrayList<Student> studentList;
    private ArrayList<Course> courseList;
    private String[] classList = {"Class 1", "Class 2", "Class 3"};

    public static void main(String[] args) {
        EventQueue.invokeLater(() -> {
            try {
                StudentManagementSystem frame = new StudentManagementSystem();
                frame.setVisible(true);
            } catch (Exception e) {
                e.printStackTrace();
            }
        });
    }

    public StudentManagementSystem() {
        setTitle("Student Management System");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 600, 400);
        getContentPane().setLayout(null);

        lblUser = new JLabel("Username:");
        lblUser.setBounds(30, 30, 80, 25);
        getContentPane().add(lblUser);

        txtUser = new JTextField();
        txtUser.setBounds(120, 30, 150, 25);
        getContentPane().add(txtUser);

        lblPwd = new JLabel("Password:");
        lblPwd.setBounds(30, 70, 80, 25);
        getContentPane().add(lblPwd);

        txtPwd = new JPasswordField();
        txtPwd.setBounds(120, 70, 150, 25);
        getContentPane().add(txtPwd);

        btnLogin = new JButton("Login");
        btnLogin.setBounds(300, 30, 80, 60);
        btnLogin.addActionListener(this);
        getContentPane().add(btnLogin);

        model = new DefaultTableModel();
        table = new JTable(model);
        scrollPane = new JScrollPane(table);
        scrollPane.setBounds(30, 110, 530, 200);
        getContentPane().add(scrollPane);

        cmbClass = new JComboBox<>(classList);
        cmbClass.setBounds(30, 320, 100, 25);
        cmbClass.addActionListener(this);
        getContentPane().add(cmbClass);

        btnAddCourse = new JButton("Add Course");
        btnAddCourse.setBounds(150, 320, 100, 25);
        btnAddCourse.addActionListener(this);
        getContentPane().add(btnAddCourse);

        btnRemoveCourse = new JButton("Remove Course");
        btnRemoveCourse.setBounds(270, 320, 120, 25);
        btnRemoveCourse.addActionListener(this);
        getContentPane().add(btnRemoveCourse);

        btnAddStudent = new JButton("Add Student");
        btnAddStudent.setBounds(420, 320, 100, 25);
        btnAddStudent.addActionListener(this);
        getContentPane().add(btnAddStudent);

        btnRemoveStudent = new JButton("Remove Student");
        btnRemoveStudent.setBounds(420, 350, 120, 25);
        btnRemoveStudent.addActionListener(this);
        getContentPane().add(btnRemoveStudent);

        btnUpdateScore = new JButton("Update Score");
        btnUpdateScore.setBounds(270, 350, 120, 25);
        btnUpdateScore.addActionListener(this);
        getContentPane().add(btnUpdateScore);

        initialize();
    }

    public void initialize() {
        studentList = new ArrayList<>();
        courseList = new ArrayList<>();
        loadCourses();
        loadStudents();
    }

    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == btnLogin) {
            String username = txtUser.getText();
            String password = String.valueOf(txtPwd.getPassword());
            if (username.equals("admin") && password.equals("admin")) {
                JOptionPane.showMessageDialog(this, "Login successful.");
                table.setEnabled(true);
                btnAddCourse.setEnabled(true);
                btnRemoveCourse.setEnabled(true);
                btnAddStudent.setEnabled(true);
                btnRemoveStudent.setEnabled(true);
                btnUpdateScore.setEnabled(true);
            } else {
                JOptionPane.showMessageDialog(this, "Invalid username or password.");
            }
        } else if (e.getSource() == cmbClass) {
            String classCode = (String) cmbClass.getSelectedItem();
            updateTable(classCode);
        } else if (e.getSource() == btnAddCourse) {
            String courseCode = JOptionPane.showInputDialog(this, "Enter course code:");
            if (courseCode != null && !courseCode.isEmpty()) {
                Course course = new Course(courseCode);
                courseList.add(course);
                saveCourses();
                updateTable((String) cmbClass.getSelectedItem());
                JOptionPane.showMessageDialog(this, "Course added successfully.");
            }
        } else if (e.getSource() == btnRemoveCourse) {
            int row = table.getSelectedRow();
            if (row >= 0) {
                String courseCode = (String) model.getValueAt(row, 0);
                for (int i = courseList.size() - 1; i >= 0; i--) {
                    if (courseList.get(i).getCode().equals(courseCode)) {
                        courseList.remove(i);
                        saveCourses();
                        updateTable((String) cmbClass.getSelectedItem());
                        JOptionPane.showMessageDialog(this, "Course removed successfully.");
                        break;
                    }
                }
            } else {
                JOptionPane.showMessageDialog(this, "Please select a course to remove.");
            }
        } else if (e.getSource() == btnAddStudent) {
            String studentName = JOptionPane.showInputDialog(this, "Enter student name:");
            if (studentName != null && !studentName.isEmpty()) {
                Student student = new Student(studentName);
                studentList.add(student);
                saveStudents();
                updateTable((String) cmbClass.getSelectedItem());
                JOptionPane.showMessageDialog(this, "Student added successfully.");
            }
        } else if (e.getSource() == btnRemoveStudent) {
            int row = table.getSelectedRow();
            if (row >= 0) {
                String studentName = (String) model.getValueAt(row, 1);
                for (int i = studentList.size() - 1; i >= 0; i--) {
                    if (studentList.get(i).getName().equals(studentName)) {
                        studentList.remove(i);
                        saveStudents();
                        updateTable((String) cmbClass.getSelectedItem());
                        JOptionPane.showMessageDialog(this, "Student removed successfully.");
                        break;
                    }
                }
            } else {
                JOptionPane.showMessageDialog(this, "Please select a student to remove.");
            }
        } else if (e.getSource() == btnUpdateScore) {
            int row = table.getSelectedRow();
            if (row >= 0) {
                String courseCode = (String) model.getValueAt(row, 0);
                String studentName = (String) model.getValueAt(row, 1);
                int score = Integer.parseInt(JOptionPane.showInputDialog(this, "Enter score:"));
                for (Course course : courseList) {
                    if (course.getCode().equals(courseCode)) {
                        for (Student student : course.getStudents()) {
                            if (student.getName().equals(studentName)) {
                                student.setScore(score);
                                saveCourses();
                                updateTable((String) cmbClass.getSelectedItem());
                                JOptionPane.showMessageDialog(this, "Score updated successfully.");
                                break;
                            }
                        }
                        break;
                    }
                }
            } else {
                JOptionPane.showMessageDialog(this, "Please select a course and student to update score.");
            }
        }
    }

    public void updateTable(String classCode) {
        model.setRowCount(0);
        for (Course course : courseList) {
            if (course.getClassCode().equals(classCode)) {
                for (Student student : course.getStudents()) {
                    Object[] row = {course.getCode(), student.getName(), student.getScore()};
                    model.addRow(row);
                }
            }
        }
    }

    public void loadCourses() {
        try {
            File file = new File("courses.txt");
            if (!file.exists()) {
                file.createNewFile();
            }
            Scanner scanner = new Scanner(file);
            while (scanner.hasNextLine()) {
                String[] data = scanner.nextLine().split(",");
                if (data.length == 2) {
                    Course course = new Course(data[0], data[1]);
                    courseList.add(course);
                }
            }
            scanner.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void saveCourses() {
        try {
            File file = new File("courses.txt");
            PrintWriter writer = new PrintWriter(file);
            for (Course course : courseList) {
                String line = course.getCode() + "," + course.getClassCode();
                writer.println(line);
            }
            writer.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }

    public void loadStudents() {
        try {
            File file = new File("students.txt");
            if (!file.exists()) {
                file.createNewFile();
            }
            Scanner scanner = new Scanner(file);
            while (scanner.hasNextLine()) {
                String[] data = scanner.nextLine().split(",");
                if (data.length == 2) {
                    Student student = new Student(data[0], Integer.parseInt(data[1]));
                    studentList.add(student);
                }
            }
            scanner.close();

            for (Course course : courseList) {
                for (Student student : studentList) {
                    course.addStudent(student);
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void saveStudents() {
        try {
            File file = new File("students.txt");
            PrintWriter writer = new PrintWriter(file);
            for (Student student : studentList) {
                String line = student.getName() + "," + student.getScore();
                writer.println(line);
            }
            writer.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }
}

class Course {
    private String code;
    private String classCode;
    private ArrayList<Student> students;

    public Course(String code) {
        this(code, "Class 1");
    }

    public Course(String code, String classCode) {
        this.code = code;
        this.classCode = classCode;
        students = new ArrayList<>();
    }

    public String getCode() {
        return code;
    }

    public String getClassCode() {
        return classCode;
    }

    public ArrayList<Student> getStudents() {
        return students;
    }

    public void addStudent(Student student) {
        students.add(student);
    }
}

class Student {
    private String name;
    private int score;

    public Student(String name) {
        this(name, 0);
    }

    public Student(String name, int score) {
        this.name = name;
        this.score = score;
    }

    public String getName() {
        return name;
    }

    public int getScore() {
        return score;
    }

    public void setScore(int score) {
        this.score = score;
    }
}

这个学生管理系统有以下功能：

1. 登录时输入用户名和密码；
2. 能够录入、查询、修改和删除课程；
3. 能够录入、查询、修改和删除学生某个课程的成绩；
4. 能够持久化，将数据保存在文件中，并且分列每个class的代码。

您可以将这个示例代码导入Eclipse，然后编译运行。