学生管理系统Java代码

以下是一个简单的学生管理系统的Java代码示例：

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

public class StudentManagementSystem {
    private static ArrayList<Student> students = new ArrayList<>();
    private static Scanner scanner = new Scanner(System.in);

    public static void main(String[] args) {
        while (true) {
            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. 查看学生信息");
            System.out.println("5. 退出系统");
            System.out.println("请选择操作：");
            int option = scanner.nextInt();
            switch (option) {
                case 1:
                    addStudent();
                    break;
                case 2:
                    deleteStudent();
                    break;
                case 3:
                    modifyStudent();
                    break;
                case 4:
                    viewStudents();
                    break;
                case 5:
                    System.exit(0);
                default:
                    System.out.println("无效操作");
                    break;
            }
        }
    }

    private static void addStudent() {
        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 clazz = scanner.next();
        students.add(new Student(name, age, gender, clazz));
        System.out.println("添加成功");
    }

    private static void deleteStudent() {
        System.out.println("请输入要删除的学生姓名：");
        String name = scanner.next();
        for (Student student : students) {
            if (student.getName().equals(name)) {
                students.remove(student);
                System.out.println("删除成功");
                return;
            }
        }
        System.out.println("未找到该学生");
    }

    private static void modifyStudent() {
        System.out.println("请输入要修改的学生姓名：");
        String name = scanner.next();
        for (Student student : students) {
            if (student.getName().equals(name)) {
                System.out.println("请输入新的学生姓名：");
                String newName = scanner.next();
                System.out.println("请输入新的学生年龄：");
                int newAge = scanner.nextInt();
                System.out.println("请输入新的学生性别：");
                String newGender = scanner.next();
                System.out.println("请输入新的学生班级：");
                String newClazz = scanner.next();
                student.setName(newName);
                student.setAge(newAge);
                student.setGender(newGender);
                student.setClazz(newClazz);
                System.out.println("修改成功");
                return;
            }
        }
        System.out.println("未找到该学生");
    }

    private static void viewStudents() {
        System.out.println("学生姓名\t学生年龄\t学生性别\t学生班级");
        for (Student student : students) {
            System.out.printf("%s\t%d\t%s\t%s\n", student.getName(), student.getAge(), student.getGender(), student.getClazz());
        }
    }
}

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

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

    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;
    }
}

这个学生管理系统可以实现添加、删除、修改、查看学生信息的功能。当用户选择退出系统时，程序会终止。该程序使用了ArrayList来存储学生信息，用Scanner来获取用户输入。注意，在删除和修改学生信息时，程序需要先查找学生是否存在，如果不存在则提示用户未找到该学生。