用java语言写一个学生成绩管理系统适配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，且进入时打开新的界面，且自定义学生成绩的初始条件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

好的，以下是一个简单的学生成绩管理系统的Java代码，适配Eclipse编译系统，满足您提出的要求：

import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.table.DefaultTableModel;

public class StudentGradeManagementSystem {

    private JFrame frame;
    private JTextField textFieldUsername;
    private JPasswordField passwordField;
    private JTable table;
    private DefaultTableModel model;
    private List<Student> students;
    private List<Course> courses;
    private File file;

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    StudentGradeManagementSystem window = new StudentGradeManagementSystem();
                    window.frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the application.
     */
    public StudentGradeManagementSystem() {
        initialize();
    }

    /**
     * Initialize the contents of the frame.
     */
    private void initialize() {
        // Load data from file
        loadData();

        frame = new JFrame();
        frame.setBounds(100, 100, 600, 400);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().setLayout(null);

        // Login Panel
        JPanel panelLogin = new JPanel();
        panelLogin.setBounds(10, 10, 564, 343);
        panelLogin.setLayout(null);
        frame.getContentPane().add(panelLogin);

        JLabel lblUsername = new JLabel("Username:");
        lblUsername.setBounds(140, 100, 80, 20);
        panelLogin.add(lblUsername);

        textFieldUsername = new JTextField();
        textFieldUsername.setBounds(230, 100, 120, 20);
        panelLogin.add(textFieldUsername);
        textFieldUsername.setColumns(10);

        JLabel lblPassword = new JLabel("Password:");
        lblPassword.setBounds(140, 140, 80, 20);
        panelLogin.add(lblPassword);

        passwordField = new JPasswordField();
        passwordField.setBounds(230, 140, 120, 20);
        panelLogin.add(passwordField);

        JButton btnLogin = new JButton("Login");
        btnLogin.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String username = textFieldUsername.getText();
                String password = new String(passwordField.getPassword());
                if (username.equals("admin") && password.equals("admin")) {
                    openMainPanel();
                } else {
                    JOptionPane.showMessageDialog(frame, "Invalid username or password!");
                }
            }
        });
        btnLogin.setBounds(230, 180, 80, 20);
        panelLogin.add(btnLogin);

        // Main Panel
        JPanel panelMain = new JPanel();
        panelMain.setBounds(10, 10, 564, 343);
        panelMain.setLayout(null);
        frame.getContentPane().add(panelMain);
        panelMain.setVisible(false);

        JLabel lblTitle = new JLabel("Student Grade Management System");
        lblTitle.setBounds(180, 10, 250, 20);
        panelMain.add(lblTitle);

        JButton btnAddCourse = new JButton("Add Course");
        btnAddCourse.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String courseName = JOptionPane.showInputDialog(frame, "Enter course name:");
                if (courseName != null && !courseName.isEmpty()) {
                    courses.add(new Course(courseName));
                    saveData();
                    updateTable();
                }
            }
        });
        btnAddCourse.setBounds(20, 50, 100, 20);
        panelMain.add(btnAddCourse);

        JButton btnEditCourse = new JButton("Edit Course");
        btnEditCourse.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                int selectedIndex = table.getSelectedRow();
                if (selectedIndex >= 0) {
                    Course course = courses.get(selectedIndex);
                    String courseName = JOptionPane.showInputDialog(frame, "Enter course name:", course.getName());
                    if (courseName != null && !courseName.isEmpty()) {
                        course.setName(courseName);
                        saveData();
                        updateTable();
                    }
                } else {
                    JOptionPane.showMessageDialog(frame, "Please select a course!");
                }
            }
        });
        btnEditCourse.setBounds(130, 50, 100, 20);
        panelMain.add(btnEditCourse);

        JButton btnDeleteCourse = new JButton("Delete Course");
        btnDeleteCourse.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                int selectedIndex = table.getSelectedRow();
                if (selectedIndex >= 0) {
                    courses.remove(selectedIndex);
                    saveData();
                    updateTable();
                } else {
                    JOptionPane.showMessageDialog(frame, "Please select a course!");
                }
            }
        });
        btnDeleteCourse.setBounds(240, 50, 100, 20);
        panelMain.add(btnDeleteCourse);

        JButton btnAddStudent = new JButton("Add Student");
        btnAddStudent.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String studentName = JOptionPane.showInputDialog(frame, "Enter student name:");
                if (studentName != null && !studentName.isEmpty()) {
                    Student student = new Student(studentName);
                    for (Course course : courses) {
                        String grade = JOptionPane.showInputDialog(frame, "Enter grade for " + course.getName() + ":");
                        if (grade != null && !grade.isEmpty()) {
                            student.addGrade(course, Double.parseDouble(grade));
                        }
                    }
                    students.add(student);
                    saveData();
                    updateTable();
                }
            }
        });
        btnAddStudent.setBounds(20, 80, 100, 20);
        panelMain.add(btnAddStudent);

        JButton btnEditStudent = new JButton("Edit Student");
        btnEditStudent.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                int selectedIndex = table.getSelectedRow();
                if (selectedIndex >= 0) {
                    Student student = students.get(selectedIndex);
                    String studentName = JOptionPane.showInputDialog(frame, "Enter student name:", student.getName());
                    if (studentName != null && !studentName.isEmpty()) {
                        student.setName(studentName);
                        for (Course course : courses) {
                            String grade = JOptionPane.showInputDialog(frame, "Enter grade for " + course.getName() + ":", student.getGrade(course));
                            if (grade != null && !grade.isEmpty()) {
                                student.setGrade(course, Double.parseDouble(grade));
                            }
                        }
                        saveData();
                        updateTable();
                    }
                } else {
                    JOptionPane.showMessageDialog(frame, "Please select a student!");
                }
            }
        });
        btnEditStudent.setBounds(130, 80, 100, 20);
        panelMain.add(btnEditStudent);

        JButton btnDeleteStudent = new JButton("Delete Student");
        btnDeleteStudent.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                int selectedIndex = table.getSelectedRow();
                if (selectedIndex >= 0) {
                    students.remove(selectedIndex);
                    saveData();
                    updateTable();
                } else {
                    JOptionPane.showMessageDialog(frame, "Please select a student!");
                }
            }
        });
        btnDeleteStudent.setBounds(240, 80, 100, 20);
        panelMain.add(btnDeleteStudent);

        JButton btnSortByName = new JButton("Sort by Name");
        btnSortByName.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                Collections.sort(students, new Comparator<Student>() {
                    public int compare(Student s1, Student s2) {
                        return s1.getName().compareTo(s2.getName());
                    }
                });
                updateTable();
            }
        });
        btnSortByName.setBounds(20, 110, 120, 20);
        panelMain.add(btnSortByName);

        JButton btnSortByGrade = new JButton("Sort by Grade");
        btnSortByGrade.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                Collections.sort(students, new Comparator<Student>() {
                    public int compare(Student s1, Student s2) {
                        double g1 = s1.getTotalGrade();
                        double g2 = s2.getTotalGrade();
                        if (g1 < g2) {
                            return 1;
                        } else if (g1 > g2) {
                            return -1;
                        } else {
                            return 0;
                        }
                    }
                });
                updateTable();
            }
        });
        btnSortByGrade.setBounds(150, 110, 120, 20);
        panelMain.add(btnSortByGrade);

        JScrollPane scrollPane = new JScrollPane();
        scrollPane.setBounds(20, 140, 520, 180);
        panelMain.add(scrollPane);

        table = new JTable();
        model = new DefaultTableModel(new Object[][] {}, new String[] { "Name" });
        for (Course course : courses) {
            model.addColumn(course.getName());
        }
        table.setModel(model);
        scrollPane.setViewportView(table);

        // Set default close operation
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }

    /**
     * Load data from file
     */
    private void loadData() {
        students = new ArrayList<Student>();
        courses = new ArrayList<Course>();
        file = new File("data.txt");
        if (file.exists()) {
            try {
                BufferedReader reader = new BufferedReader(new FileReader(file));
                String line;
                while ((line = reader.readLine()) != null) {
                    String[] parts = line.split(",");
                    if (parts.length == 1) {
                        courses.add(new Course(parts[0]));
                    } else {
                        Student student = new Student(parts[0]);
                        for (int i = 1; i < parts.length; i += 2) {
                            Course course = courses.get(i / 2);
                            double grade = Double.parseDouble(parts[i + 1]);
                            student.addGrade(course, grade);
                        }
                        students.add(student);
                    }
                }
                reader.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        } else {
            courses.add(new Course("Math"));
            courses.add(new Course("English"));
            courses.add(new Course("Science"));
        }
    }

    /**
     * Save data to file
     */
    private void saveData() {
        try {
            BufferedWriter writer = new BufferedWriter(new FileWriter(file));
            for (Course course : courses) {
                writer.write(course.getName());
                writer.newLine();
            }
            for (Student student : students) {
                writer.write(student.getName());
                for (Course course : courses) {
                    double grade = student.getGrade(course);
                    writer.write("," + course.getName() + "," + grade);
                }
                writer.newLine();
            }
            writer.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * Update table with data
     */
    private void updateTable() {
        model.setRowCount(0);
        for (Student student : students) {
            Object[] row = new Object[courses.size() + 1];
            row[0] = student.getName();
            for (int i = 0; i < courses.size(); i++) {
                row[i + 1] = student.getGrade(courses.get(i));
            }
            model.addRow(row);
        }
    }

    /**
     * Open main panel
     */
    private void openMainPanel() {
        frame.getContentPane().getComponent(0).setVisible(false);
        frame.getContentPane().getComponent(1).setVisible(true);
        updateTable();
    }

    /**
     * Course class
     */
    private class Course {

        private String name;

        public Course(String name) {
            this.name = name;
        }

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

    }

    /**
     * Student class
     */
    private class Student {

        private String name;
        private List<Double> grades;

        public Student(String name) {
            this.name = name;
            grades = new ArrayList<Double>();
            for (int i = 0; i < courses.size(); i++) {
                grades.add(0.0);
            }
        }

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

        public double getGrade(Course course) {
            return grades.get(courses.indexOf(course));
        }

        public void addGrade(Course course, double grade) {
            grades.set(courses.indexOf(course), grade);
        }

        public void setGrade(Course course, double grade) {
            addGrade(course, grade);
        }

        public double getTotalGrade() {
            double total = 0;
            for (Double grade : grades) {
                total += grade;
            }
            return total;
        }

    }

}

这个代码实现了以下功能：
1. 有图形界面。
2. 登录时输入用户密码，且进入时打开新的界面。
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. 能够持久化数据，将数据保存到文件中。