java学生管理系统代码

以下是一个简单的 Java 学生管理系统代码，包含了学生信息的增删改查功能：

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

public class StudentManagementSystem {
    public static void main(String[] args) {
        ArrayList<Student> studentList = new ArrayList<>();
        Scanner scanner = new Scanner(System.in);
        boolean flag = true;
        while (flag) {
            System.out.println("请选择操作：");
            System.out.println("1. 添加学生");
            System.out.println("2. 修改学生");
            System.out.println("3. 删除学生");
            System.out.println("4. 查询学生");
            System.out.println("5. 退出程序");
            int option = scanner.nextInt();

            switch (option) {
                case 1:
                    addStudent(studentList, scanner);
                    break;
                case 2:
                    updateStudent(studentList, scanner);
                    break;
                case 3:
                    deleteStudent(studentList, scanner);
                    break;
                case 4:
                    queryStudent(studentList, scanner);
                    break;
                case 5:
                    flag = false;
                    break;
            }
        }
    }

    private static void addStudent(ArrayList<Student> studentList, Scanner scanner) {
        System.out.println("请输入学生姓名：");
        String name = scanner.next();
        System.out.println("请输入学生年龄：");
        int age = scanner.nextInt();
        System.out.println("请输入学生性别：");
        String gender = scanner.next();
        System.out.println("请输入学生班级：");
        String className = scanner.next();
        Student student = new Student(name, age, gender, className);
        studentList.add(student);
        System.out.println("添加学生成功！");
    }

    private static void updateStudent(ArrayList<Student> studentList, Scanner scanner) {
        System.out.println("请输入要修改的学生姓名：");
        String name = scanner.next();
        for (Student student : studentList) {
            if (student.getName().equals(name)) {
                System.out.println("请输入修改后的学生年龄：");
                int age = scanner.nextInt();
                System.out.println("请输入修改后的学生性别：");
                String gender = scanner.next();
                System.out.println("请输入修改后的学生班级：");
                String className = scanner.next();
                student.setAge(age);
                student.setGender(gender);
                student.setClassName(className);
                System.out.println("修改学生信息成功！");
                return;
            }
        }
        System.out.println("未找到该学生！");
    }

    private static void deleteStudent(ArrayList<Student> studentList, Scanner scanner) {
        System.out.println("请输入要删除的学生姓名：");
        String name = scanner.next();
        for (Student student : studentList) {
            if (student.getName().equals(name)) {
                studentList.remove(student);
                System.out.println("删除学生成功！");
                return;
            }
        }
        System.out.println("未找到该学生！");
    }

    private static void queryStudent(ArrayList<Student> studentList, Scanner scanner) {
        System.out.println("请输入要查询的学生姓名：");
        String name = scanner.next();
        for (Student student : studentList) {
            if (student.getName().equals(name)) {
                System.out.println(student);
                return;
            }
        }
        System.out.println("未找到该学生！");
    }
}

class Student {
    private String name;
    private int age;
    private String gender;
    private String className;

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

    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 getClassName() {
        return className;
    }

    public void setClassName(String className) {
        this.className = className;
    }

    @Override
    public String toString() {
        return "姓名：" + name + "\n年龄：" + age + "\n性别：" + gender + "\n班级：" + className;
    }
}

该程序使用了 ArrayList 存储学生信息，通过 Scanner 读取用户输入，通过 switch-case 实现不同操作的功能。其中，Student 类为学生信息的封装类。