j ava学生管理系统

Java 学生管理系统是一个常见的课程设计项目，它主要用于管理学生信息，包括学生的基本信息、课程信息、成绩信息等。以下是一个简单的 Java 学生管理系统的实现：

1. 创建一个 Student 类，用于存储学生的基本信息，包括学号、姓名、性别、年龄等。

public class Student {
    private int id; // 学号
    private String name; // 姓名
    private String gender; // 性别
    private int age; // 年龄

    public Student(int id, String name, String gender, int age) {
        this.id = id;
        this.name = name;
        this.gender = gender;
        this.age = age;
    }

    // getter 和 setter 方法
    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

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

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }
}

2. 创建一个 Course 类，用于存储课程信息，包括课程编号、课程名称、学分等。

public class Course {
    private int courseId; // 课程编号
    private String courseName; // 课程名称
    private int credit; // 学分

    public Course(int courseId, String courseName, int credit) {
        this.courseId = courseId;
        this.courseName = courseName;
        this.credit = credit;
    }

    // getter 和 setter 方法
    public int getCourseId() {
        return courseId;
    }

    public void setCourseId(int courseId) {
        this.courseId = courseId;
    }

    public String getCourseName() {
        return courseName;
    }

    public void setCourseName(String courseName) {
        this.courseName = courseName;
    }

    public int getCredit() {
        return credit;
    }

    public void setCredit(int credit) {
        this.credit = credit;
    }
}

3. 创建一个 Score 类，用于存储学生成绩信息，包括学生编号、课程编号、分数等。

public class Score {
    private int studentId; // 学生编号
    private int courseId; // 课程编号
    private int score; // 分数

    public Score(int studentId, int courseId, int score) {
        this.studentId = studentId;
        this.courseId = courseId;
        this.score = score;
    }

    // getter 和 setter 方法
    public int getStudentId() {
        return studentId;
    }

    public void setStudentId(int studentId) {
        this.studentId = studentId;
    }

    public int getCourseId() {
        return courseId;
    }

    public void setCourseId(int courseId) {
        this.courseId = courseId;
    }

    public int getScore() {
        return score;
    }

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

4. 创建一个 StudentManagementSystem 类，用于实现学生管理系统的功能，包括添加学生、删除学生、修改学生信息、查询学生信息等。

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

public class StudentManagementSystem {
    // 学生列表
    private List<Student> students = new ArrayList<>();

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

    // 成绩列表
    private List<Score> scores = new ArrayList<>();

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

    // 删除学生
    public void deleteStudent() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入学号：");
        int id = scanner.nextInt();
        for (int i = 0; i < students.size(); i++) {
            Student student = students.get(i);
            if (student.getId() == id) {
                students.remove(i);
                System.out.println("删除学生信息成功！");
                break;
            }
        }
    }

    // 修改学生信息
    public void updateStudent() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入学号：");
        int id = scanner.nextInt();
        for (Student student : students) {
            if (student.getId() == id) {
                System.out.println("请输入姓名：");
                String name = scanner.next();
                System.out.println("请输入性别：");
                String gender = scanner.next();
                System.out.println("请输入年龄：");
                int age = scanner.nextInt();
                student.setName(name);
                student.setGender(gender);
                student.setAge(age);
                System.out.println("修改学生信息成功！");
                break;
            }
        }
    }

    // 查询学生信息
    public void queryStudent() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入学号：");
        int id = scanner.nextInt();
        for (Student student : students) {
            if (student.getId() == id) {
                System.out.println("学号：" + student.getId());
                System.out.println("姓名：" + student.getName());
                System.out.println("性别：" + student.getGender());
                System.out.println("年龄：" + student.getAge());
                break;
            }
        }
    }

    // 添加课程
    public void addCourse() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入课程编号：");
        int courseId = scanner.nextInt();
        System.out.println("请输入课程名称：");
        String courseName = scanner.next();
        System.out.println("请输入学分：");
        int credit = scanner.nextInt();
        Course course = new Course(courseId, courseName, credit);
        courses.add(course);
        System.out.println("添加课程信息成功！");
    }

    // 删除课程
    public void deleteCourse() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入课程编号：");
        int courseId = scanner.nextInt();
        for (int i = 0; i < courses.size(); i++) {
            Course course = courses.get(i);
            if (course.getCourseId() == courseId) {
                courses.remove(i);
                System.out.println("删除课程信息成功！");
                break;
            }
        }
    }

    // 修改课程信息
    public void updateCourse() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入课程编号：");
        int courseId = scanner.nextInt();
        for (Course course : courses) {
            if (course.getCourseId() == courseId) {
                System.out.println("请输入课程名称：");
                String courseName = scanner.next();
                System.out.println("请输入学分：");
                int credit = scanner.nextInt();
                course.setCourseName(courseName);
                course.setCredit(credit);
                System.out.println("修改课程信息成功！");
                break;
            }
        }
    }

    // 查询课程信息
    public void queryCourse() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入课程编号：");
        int courseId = scanner.nextInt();
        for (Course course : courses) {
            if (course.getCourseId() == courseId) {
                System.out.println("课程编号：" + course.getCourseId());
                System.out.println("课程名称：" + course.getCourseName());
                System.out.println("学分：" + course.getCredit());
                break;
            }
        }
    }

    // 添加成绩
    public void addScore() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入学生编号：");
        int studentId = scanner.nextInt();
        System.out.println("请输入课程编号：");
        int courseId = scanner.nextInt();
        System.out.println("请输入分数：");
        int score = scanner.nextInt();
        Score s = new Score(studentId, courseId, score);
        scores.add(s);
        System.out.println("添加成绩信息成功！");
    }

    // 删除成绩
    public void deleteScore() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入学生编号：");
        int studentId = scanner.nextInt();
        System.out.println("请输入课程编号：");
        int courseId = scanner.nextInt();
        for (int i = 0; i < scores.size(); i++) {
            Score s = scores.get(i);
            if (s.getStudentId() == studentId && s.getCourseId() == courseId) {
                scores.remove(i);
                System.out.println("删除成绩信息成功！");
                break;
            }
        }
    }

    // 修改成绩信息
    public void updateScore() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入学生编号：");
        int studentId = scanner.nextInt();
        System.out.println("请输入课程编号：");
        int courseId = scanner.nextInt();
        for (Score s : scores) {
            if (s.getStudentId() == studentId && s.getCourseId() == courseId) {
                System.out.println("请输入分数：");
                int score = scanner.nextInt();
                s.setScore(score);
                System.out.println("修改成绩信息成功！");
                break;
            }
        }
    }

    // 查询成绩信息
    public void queryScore() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入学生编号：");
        int studentId = scanner.nextInt();
        System.out.println("请输入课程编号：");
        int courseId = scanner.nextInt();
        for (Score s : scores) {
            if (s.getStudentId() == studentId && s.getCourseId() == courseId) {
                System.out.println("学生编号：" + s.getStudentId());
                System.out.println("课程编号：" + s.getCourseId());
                System.out.println("分数：" + s.getScore());
                break;
            }
        }
    }

    // 主程序
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        StudentManagementSystem system = new StudentManagementSystem();

        while (true) {
            System.out.println("请选择操作：");
            System.out.println("1. 添加学生信息");
            System.out.println("2. 删除学生信息");
            System.out.println("3. 修改学生信息");
            System.out.println("4. 查询学生信息");
            System.out.println("5. 添加课程信息");
            System.out.println("6. 删除课程信息");
            System.out.println("7. 修改课程信息");
            System.out.println("8. 查询课程信息");
            System.out.println("9. 添加成绩信息");
            System.out.println("10. 删除成绩信息");
            System.out.println("11. 修改成绩信息");
            System.out.println("12. 查询成绩信息");
            System.out.println("0. 退出系统");

            int choice = scanner.nextInt();
            switch (choice) {
                case 1:
                    system.addStudent();
                    break;
                case 2:
                    system.deleteStudent();
                    break;
                case 3:
                    system.updateStudent();
                    break;
                case 4:
                    system.queryStudent();
                    break;
                case 5:
                    system.addCourse();
                    break;
                case 6:
                    system.deleteCourse();
                    break;
                case 7:
                    system.updateCourse();
                    break;
                case 8:
                    system.queryCourse();
                    break;
                case 9:
                    system.addScore();
                    break;
                case 10:
                    system.deleteScore();
                    break;
                case 11:
                    system.updateScore();
                    break;
                case 12:
                    system.queryScore();
                    break;
                case 0:
                    System.exit(0);
                default:
                    System.out.println("无效操作，请重新输入！");
                    break;
            }
        }
    }
}

以上就是一个简单的 Java 学生管理系统的实现。在实际应用中，还可以根据需要对其进行扩展和优化。