简易学生管理系统

 Student 类

package konoha.naruto.test;

public class Student {
    private String sid;
    private String name;
    private int age;
    private String birthday;

    public Student() {

    }

    public Student(String sid, String name, int age, String birthday) {
        this.sid = sid;
        this.name = name;
        this.age = age;
        this.birthday = birthday;
    }

    public String getSid() {
        return sid;
    }

    public void setSid(String sid) {
        this.sid = sid;
    }

    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 getBirthday() {
        return birthday;
    }

    public void setBirthday(String birthday) {
        this.birthday = birthday;
    }
}

测试类

package konoha.naruto.test;

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

public class StudentManager {
    public static void main(String[] args) {
        ArrayList<Student> list = new ArrayList<>();
        // 1. 搭建主界面菜单
        lo:
        while (true) {
            Scanner sc = new Scanner(System.in);
            System.out.println("--------欢迎来到学生管理系统--------");
            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 查看学生");
            System.out.println("5 退出");
            System.out.println("请输入您的选择:");
            String choice = sc.next();
            switch (choice) {
                case "1":
                    System.out.println("添加学生");
                    addStudent(list);
                    break;
                case "2":
                    System.out.println("删除学生");
                    deleteStudent(list);
                    break;
                case "3":
                    System.out.println("修改学生");
                    updateStudent(list);
                    break;
                case "4":
                    System.out.println("查看学生");
                    queryStudent(list);
                    break;
                case "5":
                    System.out.println("感谢使用");
                    break lo;
                default:
                    System.out.println("您的输入有误，请重新输入");
            }
        }
    }

    private static void queryStudent(ArrayList<Student> list) {
        if (list.size() == 0) {
            System.out.println("无信息，请添加后重新查询");
            return;
        }
        System.out.println("学号"+"\t"+"\t"+"姓名"+"\t"+"年龄"+"\t"+"生日");
        for (int i = 0; i < list.size(); i++) {
            Student stu = list.get(i);
            System.out.println(stu.getSid() + "\t" + "\t" + stu.getName() + "\t" + stu.getAge() + "\t\t" + stu.getBirthday());
        }
    }

    private static void updateStudent(ArrayList<Student> list) {
        System.out.println("请输入您要修改的学生学号：");
        Scanner sc = new Scanner(System.in);
        String updateSid = sc.next();
        int index = getIndex(list, updateSid);
        if (index == -1) {
            System.out.println("没有该学生，请重新输入");

        } else {
            System.out.println("请输入新的学生姓名:");
            String name = sc.next();
            System.out.println("请输入新的学生年龄:");
            int age = sc.nextInt();
            System.out.println("请输入新的学生生日:");
            String birthday = sc.next();
            // 封装为新的学生对象
            Student stu = new Student(updateSid, name, age, birthday);
            list.set(index, stu);
            System.out.println("修改成功!");
        }
    }

    private static void deleteStudent(ArrayList<Student> list) {
        // 1. 给出提示信息 (请输入您要删除的学号)
        System.out.println("请输入您要删除的学生学号:");
        // 2. 键盘接收要删除的学号
        Scanner sc = new Scanner(System.in);
        String deleteSid = sc.next();//002
        // 3. 调用getIndex方法, 查找该学号在集合中出现的索引位置
        int index = getIndex(list, deleteSid);
        // 4. 根据索引判断, 学号在集合中是否存在
        if (index == -1) {
            // 不存在: 给出提示
            System.out.println("查无信息, 请重新输入");
        } else {
            // 存在:删除
            list.remove(index);
            System.out.println("删除成功!");
        }
    }

    private static void addStudent(ArrayList<Student> list) {
        Scanner sc = new Scanner(System.in);
        String sid;

        while (true) {
            System.out.println("请输入学号");
            sid = sc.next();
            int index = getIndex(list, sid);
            if (index == -1) {
                // sid不存在, 学号可以使用
                break;
            }else{
                System.out.println("该学号已经存在 请重新输入");

            }
        }


        System.out.println("请输入姓名:");
        String name = sc.next();
        System.out.println("请输入年龄:");
        int age = sc.nextInt();
        System.out.println("请输入生日:");
        String birthday = sc.next();
        // 2. 将键盘录入的信息封装为学生对象
        Student stu = new Student(sid, name, age, birthday);
        // 3. 将封装好的学生对象, 添加到集合容器当中
        list.add(stu);
        // 4. 给出添加成功的提示信息
        System.out.println("添加成功!");
    }

    public static int getIndex(ArrayList<Student> list, String sid) {
        int index = -1;
        for (int i = 0; i < list.size(); i++) {
            Student stu = list.get(i);//获取每一个学生对象的学号
            String id = stu.getSid();
            if (id.equals(sid)) {
                index = i;
            }
        }
        return index;
    }
}