用Java代码实现班级学生成绩管理系统 完成学生信息管理。具体包括学生信息的新增、修改、删除、查询等功能。学生信息包括学号、姓名、性别、年龄等； 2、完成课程信息管理。具体包括课程编号、课程名称、课时数、课程性质（选修、必修）、学分、授课教师等； 3、完成学生成绩管理。具体针对选择的课程对学生的成绩进行录入；并能实现单个学生单门课程的成绩录入过程；同时完成成绩的查找功能

好的，以下是一个基本的班级学生成绩管理系统的Java代码示例，包括学生信息管理、课程信息管理和学生成绩管理功能。具体实现细节可以根据实际需求进行修改。

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Scanner;

public class StudentScoreManagementSystem {

    // 定义学生类
    static class Student {
        String id; // 学号
        String name; // 姓名
        String gender; // 性别
        int age; // 年龄
        Map<String, Integer> scores; // 成绩

        public Student(String id, String name, String gender, int age) {
            this.id = id;
            this.name = name;
            this.gender = gender;
            this.age = age;
            this.scores = new HashMap<>();
        }

        public void addScore(String courseId, int score) {
            scores.put(courseId, score);
        }

        public int getScore(String courseId) {
            return scores.getOrDefault(courseId, -1);
        }

        public void printInfo() {
            System.out.println("学号：" + id + "，姓名：" + name + "，性别：" + gender + "，年龄：" + age);
            System.out.println("成绩：");
            for (String courseId : scores.keySet()) {
                System.out.println(courseId + "：" + scores.get(courseId));
            }
            System.out.println();
        }
    }

    // 定义课程类
    static class Course {
        String id; // 课程编号
        String name; // 课程名称
        int hours; // 课时数
        String type; // 课程性质
        int credit; // 学分
        String teacher; // 授课教师

        public Course(String id, String name, int hours, String type, int credit, String teacher) {
            this.id = id;
            this.name = name;
            this.hours = hours;
            this.type = type;
            this.credit = credit;
            this.teacher = teacher;
        }

        public void printInfo() {
            System.out.println("课程编号：" + id + "，课程名称：" + name + "，课时数：" + hours + "，课程性质：" + type + "，学分：" + credit + "，授课教师：" + teacher);
        }
    }

    // 学生列表
    static List<Student> students = new ArrayList<>();

    // 课程列表
    static List<Course> courses = new ArrayList<>();

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        while (true) {
            System.out.println("请选择操作：1-学生信息管理，2-课程信息管理，3-学生成绩管理，4-退出");
            int choice = scanner.nextInt();
            switch (choice) {
                case 1:
                    studentManagement(scanner);
                    break;
                case 2:
                    courseManagement(scanner);
                    break;
                case 3:
                    scoreManagement(scanner);
                    break;
                case 4:
                    System.out.println("程序已退出！");
                    return;
                default:
                    System.out.println("无效操作！");
            }
        }
    }

    // 学生信息管理
    public static void studentManagement(Scanner scanner) {
        while (true) {
            System.out.println("请选择操作：1-新增学生，2-修改学生，3-删除学生，4-查询学生，5-返回上一级");
            int choice = scanner.nextInt();
            switch (choice) {
                case 1:
                    addStudent(scanner);
                    break;
                case 2:
                    modifyStudent(scanner);
                    break;
                case 3:
                    deleteStudent(scanner);
                    break;
                case 4:
                    queryStudent(scanner);
                    break;
                case 5:
                    return;
                default:
                    System.out.println("无效操作！");
            }
        }
    }

    // 新增学生
    public static void addStudent(Scanner scanner) {
        System.out.println("请输入学生信息：");
        System.out.print("学号：");
        String id = scanner.next();
        System.out.print("姓名：");
        String name = scanner.next();
        System.out.print("性别：");
        String gender = scanner.next();
        System.out.print("年龄：");
        int age = scanner.nextInt();
        Student student = new Student(id, name, gender, age);
        students.add(student);
        System.out.println("添加成功！");
    }

    // 修改学生
    public static void modifyStudent(Scanner scanner) {
        System.out.print("请输入要修改的学生学号：");
        String id = scanner.next();
        Student student = findStudentById(id);
        if (student == null) {
            System.out.println("学号为 " + id + " 的学生不存在！");
            return;
        }
        System.out.println("请输入新的学生信息：");
        System.out.print("姓名：");
        String name = scanner.next();
        System.out.print("性别：");
        String gender = scanner.next();
        System.out.print("年龄：");
        int age = scanner.nextInt();
        student.name = name;
        student.gender = gender;
        student.age = age;
        System.out.println("修改成功！");
    }

    // 删除学生
    public static void deleteStudent(Scanner scanner) {
        System.out.print("请输入要删除的学生学号：");
        String id = scanner.next();
        Student student = findStudentById(id);
        if (student == null) {
            System.out.println("学号为 " + id + " 的学生不存在！");
            return;
        }
        students.remove(student);
        System.out.println("删除成功！");
    }

    // 查询学生
    public static void queryStudent(Scanner scanner) {
        System.out.print("请输入要查询的学生学号：");
        String id = scanner.next();
        Student student = findStudentById(id);
        if (student == null) {
            System.out.println("学号为 " + id + " 的学生不存在！");
            return;
        }
        student.printInfo();
    }

    // 根据学号查找学生
    public static Student findStudentById(String id) {
        for (Student student : students) {
            if (student.id.equals(id)) {
                return student;
            }
        }
        return null;
    }

    // 课程信息管理
    public static void courseManagement(Scanner scanner) {
        while (true) {
            System.out.println("请选择操作：1-新增课程，2-修改课程，3-删除课程，4-查询课程，5-返回上一级");
            int choice = scanner.nextInt();
            switch (choice) {
                case 1:
                    addCourse(scanner);
                    break;
                case 2:
                    modifyCourse(scanner);
                    break;
                case 3:
                    deleteCourse(scanner);
                    break;
                case 4:
                    queryCourse(scanner);
                    break;
                case 5:
                    return;
                default:
                    System.out.println("无效操作！");
            }
        }
    }

    // 新增课程
    public static void addCourse(Scanner scanner) {
        System.out.println("请输入课程信息：");
        System.out.print("课程编号：");
        String id = scanner.next();
        System.out.print("课程名称：");
        String name = scanner.next();
        System.out.print("课时数：");
        int hours = scanner.nextInt();
        System.out.print("课程性质：");
        String type = scanner.next();
        System.out.print("学分：");
        int credit = scanner.nextInt();
        System.out.print("授课教师：");
        String teacher = scanner.next();
        Course course = new Course(id, name, hours, type, credit, teacher);
        courses.add(course);
        System.out.println("添加成功！");
    }

    // 修改课程
    public static void modifyCourse(Scanner scanner) {
        System.out.print("请输入要修改的课程编号：");
        String id = scanner.next();
        Course course = findCourseById(id);
        if (course == null) {
            System.out.println("课程编号为 " + id + " 的课程不存在！");
            return;
        }
        System.out.println("请输入新的课程信息：");
        System.out.print("课程名称：");
        String name = scanner.next();
        System.out.print("课时数：");
        int hours = scanner.nextInt();
        System.out.print("课程性质：");
        String type = scanner.next();
        System.out.print("学分：");
        int credit = scanner.nextInt();
        System.out.print("授课教师：");
        String teacher = scanner.next();
        course.name = name;
        course.hours = hours;
        course.type = type;
        course.credit = credit;
        course.teacher = teacher;
        System.out.println("修改成功！");
    }

    // 删除课程
    public static void deleteCourse(Scanner scanner) {
        System.out.print("请输入要删除的课程编号：");
        String id = scanner.next();
        Course course = findCourseById(id);
        if (course == null) {
            System.out.println("课程编号为 " + id + " 的课程不存在！");
            return;
        }
        courses.remove(course);
        System.out.println("删除成功！");
    }

    // 查询课程
    public static void queryCourse(Scanner scanner) {
        System.out.print("请输入要查询的课程编号：");
        String id = scanner.next();
        Course course = findCourseById(id);
        if (course == null) {
            System.out.println("课程编号为 " + id + " 的课程不存在！");
            return;
        }
        course.printInfo();
    }

    // 根据课程编号查找课程
    public static Course findCourseById(String id) {
        for (Course course : courses) {
            if (course.id.equals(id)) {
                return course;
            }
        }
        return null;
    }

    // 学生成绩管理
    public static void scoreManagement(Scanner scanner) {
        while (true) {
            System.out.println("请选择操作：1-录入成绩，2-查询成绩，3-返回上一级");
            int choice = scanner.nextInt();
            switch (choice) {
                case 1:
                    inputScore(scanner);
                    break;
                case 2:
                    queryScore(scanner);
                    break;
                case 3:
                    return;
                default:
                    System.out.println("无效操作！");
            }
        }
    }

    // 录入成绩
    public static void inputScore(Scanner scanner) {
        System.out.print("请输入要录入成绩的学生学号：");
        String id = scanner.next();
        Student student = findStudentById(id);
        if (student == null) {
            System.out.println("学号为 " + id + " 的学生不存在！");
            return;
        }
        System.out.println("请输入要录入成绩的课程编号：");
        String courseId = scanner.next();
        Course course = findCourseById(courseId);
        if (course == null) {
            System.out.println("课程编号为 " + courseId + " 的课程不存在！");
            return;
        }
        System.out.println("请输入成绩：");
        int score = scanner.nextInt();
        student.addScore(courseId, score);
        System.out.println("成绩录入成功！");
    }

    // 查询成绩
    public static void queryScore(Scanner scanner) {
        System.out.print("请输入要查询成绩的学生学号：");
        String id = scanner.next();
        Student student = findStudentById(id);
        if (student == null) {
            System.out.println("学号为 " + id + " 的学生不存在！");
            return;
        }
        System.out.println("请输入要查询成绩的课程编号：");
        String courseId = scanner.next();
        int score = student.getScore(courseId);
        if (score == -1) {
            System.out.println("学号为 " + id + " 的学生在课程编号为 " + courseId + " 的课程中没有成绩！");
            return;
        }
        System.out.println("学号为 " + id + " 的学生在课程编号为 " + courseId + " 的课程中的成绩为：" + score);
    }

}