java实现学生成绩管理系统

学生成绩管理系统可以使用Java语言实现，以下是一个简单的示例：

import java.util.Scanner;

public class StudentGradeManagementSystem {
    private static final int MAX_STUDENTS = 100;
    private static final int MAX_SUBJECTS = 5;

    private static String[] studentNames = new String[MAX_STUDENTS];
    private static int[][] studentGrades = new int[MAX_STUDENTS][MAX_SUBJECTS];
    private static int numStudents = 0;

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int choice = 0;
        do {
            System.out.println("请选择操作：");
            System.out.println("1. 添加学生");
            System.out.println("2. 修改学生成绩");
            System.out.println("3. 查询学生成绩");
            System.out.println("4. 退出");
            choice = scanner.nextInt();
            switch (choice) {
                case 1:
                    addStudent();
                    break;
                case 2:
                    modifyGrade();
                    break;
                case 3:
                    queryGrade();
                    break;
                case 4:
                    System.out.println("退出程序");
                    break;
                default:
                    System.out.println("无效的选择");
                    break;
            }
        } while (choice != 4);
    }

    private static void addStudent() {
        Scanner scanner = new Scanner(System.in);
        if (numStudents >= MAX_STUDENTS) {
            System.out.println("已达到最大学生数");
            return;
        }
        System.out.println("请输入学生姓名：");
        String name = scanner.nextLine();
        studentNames[numStudents] = name;
        for (int i = 0; i < MAX_SUBJECTS; i++) {
            System.out.println("请输入" + name + "的第" + (i + 1) + "科成绩：");
            int grade = scanner.nextInt();
            studentGrades[numStudents][i] = grade;
        }
        numStudents++;
        System.out.println("添加成功！");
    }

    private static void modifyGrade() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入要修改成绩的学生姓名：");
        String name = scanner.nextLine();
        int index = findStudent(name);
        if (index == -1) {
            System.out.println("未找到该学生");
            return;
        }
        System.out.println("请输入要修改成绩的科目编号：");
        int subjectIndex = scanner.nextInt() - 1;
        if (subjectIndex < 0 || subjectIndex >= MAX_SUBJECTS) {
            System.out.println("无效的科目编号");
            return;
        }
        System.out.println("请输入新的成绩：");
        int newGrade = scanner.nextInt();
        studentGrades[index][subjectIndex] = newGrade;
        System.out.println("修改成功！");
    }

    private static void queryGrade() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入要查询成绩的学生姓名：");
        String name = scanner.nextLine();
        int index = findStudent(name);
        if (index == -1) {
            System.out.println("未找到该学生");
            return;
        }
        System.out.println(name + "的成绩如下：");
        for (int i = 0; i < MAX_SUBJECTS; i++) {
            System.out.println("第" + (i + 1) + "科：" + studentGrades[index][i]);
        }
    }

    private static int findStudent(String name) {
        for (int i = 0; i < numStudents; i++) {
            if (studentNames[i].equals(name)) {
                return i;
            }
        }
        return -1;
    }
}

这个学生成绩管理系统可以添加学生、修改学生成绩和查询学生成绩。每个学生最多有5科成绩，最多可以添加100个学生。你可以根据需要进行修改和扩展。