java实现学生管理系统

学生管理系统是一个典型的信息管理系统，可以使用Java语言实现。以下是一个简单的学生管理系统实现的示例代码：

import java.util.Scanner;

public class StudentManagementSystem {
    public static void main(String[] args) {
        // 创建一个Scanner对象，用于读取用户的输入
        Scanner scanner = new Scanner(System.in);

        // 定义一个数组，用于存储学生信息
        Student[] students = new Student[100];

        // 定义一个变量，记录学生数量
        int count = 0;

        // 循环显示菜单，直到用户选择退出
        while (true) {
            System.out.println("***************************");
            System.out.println("1. 添加学生");
            System.out.println("2. 删除学生");
            System.out.println("3. 修改学生");
            System.out.println("4. 查询学生");
            System.out.println("5. 显示所有学生");
            System.out.println("0. 退出系统");
            System.out.println("***************************");

            // 读取用户的选择
            int choice = scanner.nextInt();

            switch (choice) {
                case 1:
                    addStudent(scanner, students, count);
                    count++;
                    break;
                case 2:
                    deleteStudent(scanner, students, count);
                    break;
                case 3:
                    updateStudent(scanner, students, count);
                    break;
                case 4:
                    queryStudent(scanner, students, count);
                    break;
                case 5:
                    showAllStudents(students, count);
                    break;
                case 0:
                    System.out.println("谢谢使用，再见！");
                    System.exit(0);
                default:
                    System.out.println("输入有误，请重新输入！");
            }

            // 输出一个空行，用于分隔不同的操作
            System.out.println();
        }
    }

    // 添加学生
    public static void addStudent(Scanner scanner, Student[] students, int count) {
        System.out.print("请输入学号：");
        String id = scanner.next();
        System.out.print("请输入姓名：");
        String name = scanner.next();
        System.out.print("请输入年龄：");
        int age = scanner.nextInt();
        System.out.print("请输入性别（男/女）：");
        String gender = scanner.next();
        System.out.print("请输入班级：");
        String clazz = scanner.next();
        students[count] = new Student(id, name, age, gender, clazz);
        System.out.println("添加成功！");
    }

    // 删除学生
    public static void deleteStudent(Scanner scanner, Student[] students, int count) {
        System.out.print("请输入要删除的学生的学号：");
        String id = scanner.next();
        int index = findStudentIndexById(id, students, count);
        if (index == -1) {
            System.out.println("该学生不存在！");
        } else {
            for (int i = index; i < count - 1; i++) {
                students[i] = students[i + 1];
            }
            count--;
            System.out.println("删除成功！");
        }
    }

    // 修改学生
    public static void updateStudent(Scanner scanner, Student[] students, int count) {
        System.out.print("请输入要修改的学生的学号：");
        String id = scanner.next();
        int index = findStudentIndexById(id, students, count);
        if (index == -1) {
            System.out.println("该学生不存在！");
        } else {
            System.out.print("请输入新的姓名（原姓名：" + students[index].getName() + "）：");
            String name = scanner.next();
            System.out.print("请输入新的年龄（原年龄：" + students[index].getAge() + "）：");
            int age = scanner.nextInt();
            System.out.print("请输入新的性别（原性别：" + students[index].getGender() + "）：");
            String gender = scanner.next();
            System.out.print("请输入新的班级（原班级：" + students[index].getClazz() + "）：");
            String clazz = scanner.next();
            students[index].setName(name);
            students[index].setAge(age);
            students[index].setGender(gender);
            students[index].setClazz(clazz);
            System.out.println("修改成功！");
        }
    }

    // 查询学生
    public static void queryStudent(Scanner scanner, Student[] students, int count) {
        System.out.print("请输入要查询的学生的学号：");
        String id = scanner.next();
        int index = findStudentIndexById(id, students, count);
        if (index == -1) {
            System.out.println("该学生不存在！");
        } else {
            System.out.println(students[index]);
        }
    }

    // 显示所有学生
    public static void showAllStudents(Student[] students, int count) {
        for (int i = 0; i < count; i++) {
            System.out.println(students[i]);
        }
    }

    // 根据学号查找学生在数组中的索引位置
    public static int findStudentIndexById(String id, Student[] students, int count) {
        for (int i = 0; i < count; i++) {
            if (students[i].getId().equals(id)) {
                return i;
            }
        }
        return -1;
    }
}

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

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

    public String getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

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

    public int getAge() {
        return age;
    }

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

    public String getGender() {
        return gender;
    }

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

    public String getClazz() {
        return clazz;
    }

    public void setClazz(String clazz) {
        this.clazz = clazz;
    }

    @Override
    public String toString() {
        return "学号：" + id + "，姓名：" + name + "，年龄：" + age + "，性别：" + gender + "，班级：" + clazz;
    }
}

这个学生管理系统实现了添加学生、删除学生、修改学生、查询学生、显示所有学生等功能。你可以根据自己的需要进行修改和扩展。