j ava学生管理系统代码

以下是一个简单的 Java 学生管理系统代码示例：

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

public class StudentManagementSystem {
    static ArrayList<Student> studentList = new ArrayList<>();

    static Scanner scanner = new Scanner(System.in);

    public static void main(String[] args) {
        while (true) {
            System.out.println("学生管理系统");
            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. 退出程序");

            int choice = scanner.nextInt();
            switch (choice) {
                case 1:
                    addStudent();
                    break;
                case 2:
                    deleteStudent();
                    break;
                case 3:
                    modifyStudent();
                    break;
                case 4:
                    queryStudent();
                    break;
                case 5:
                    System.exit(0);
                default:
                    System.out.println("无效的选项，请重新输入！");
                    break;
            }
        }
    }

    public static void addStudent() {
        System.out.println("添加学生");
        System.out.print("请输入学生姓名：");
        String name = scanner.next();
        System.out.print("请输入学生年龄：");
        int age = scanner.nextInt();
        System.out.print("请输入学生性别：");
        String gender = scanner.next();
        System.out.print("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("添加成功！");
    }

    public static void deleteStudent() {
        System.out.println("删除学生");
        System.out.print("请输入要删除的学生姓名：");
        String name = scanner.next();

        boolean deleted = false;
        for (int i = 0; i < studentList.size(); i++) {
            Student student = studentList.get(i);
            if (student.getName().equals(name)) {
                studentList.remove(i);
                deleted = true;
                System.out.println("删除成功！");
                break;
            }
        }

        if (!deleted) {
            System.out.println("没有找到该学生！");
        }
    }

    public static void modifyStudent() {
        System.out.println("修改学生");
        System.out.print("请输入要修改的学生姓名：");
        String name = scanner.next();

        boolean modified = false;
        for (int i = 0; i < studentList.size(); i++) {
            Student student = studentList.get(i);
            if (student.getName().equals(name)) {
                System.out.print("请输入学生年龄：");
                int age = scanner.nextInt();
                System.out.print("请输入学生性别：");
                String gender = scanner.next();
                System.out.print("请输入学生班级：");
                String className = scanner.next();

                student.setAge(age);
                student.setGender(gender);
                student.setClassName(className);
                modified = true;
                System.out.println("修改成功！");
                break;
            }
        }

        if (!modified) {
            System.out.println("没有找到该学生！");
        }
    }

    public static void queryStudent() {
        System.out.println("查询学生");
        System.out.print("请输入要查询的学生姓名：");
        String name = scanner.next();

        boolean found = false;
        for (int i = 0; i < studentList.size(); i++) {
            Student student = studentList.get(i);
            if (student.getName().equals(name)) {
                System.out.println(student.toString());
                found = true;
                break;
            }
        }

        if (!found) {
            System.out.println("没有找到该学生！");
        }
    }
}

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 + "，年龄：" + age + "，性别：" + gender + "，班级：" + className;
    }
}

这个程序实现了以下功能：

- 添加学生
- 删除学生
- 修改学生
- 查询学生

你可以根据需要进行修改和扩展。