学生管理系统代码实现java入门版本

主要使用了util的Scanner键盘输入,和集合ArrayList

由于是在java基础上写的,没有太多花哨,毕竟后端嘛,能用就行,哈哈哈哈

截图1:程序启动的界面

 截图2:添加学生

 查询后添加方法添加的数据

 截图3:删除后查询

 截图5:退出

 代码1:学生类(封装类) 为了方便,学号的类型换成了String,年龄换成了integer类型(原因:以防有空值,或者null,使用int类型的话会报错)

package StudentTest;

import lombok.Data;


public class Student {
    private String id;
    private String name;
    private Integer age;
    private String birthday;

    @Override
    public String toString() {
        return "Student{" +
                "id='" + id + ''' +
                ", name='" + name + ''' +
                ", age=" + age +
                ", birthday='" + birthday + ''' +
                '}';
    }

    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 Integer getAge() {
        return age;
    }

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

    public String getBirthday() {
        return birthday;
    }

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

    public Student(String id, String name, Integer age, String birthday) {
        this.id = id;
        this.name = name;
        this.age = age;
        this.birthday = birthday;
    }

    //无参构造
    public Student() {
    }
}

功能实现代码:里边有的方法,更简洁

package StudentTest;

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


public class StudentTest {
    public static void main(String[] args) {
        //创建键盘输入对象
        Scanner sc = new Scanner(System.in);
        //在循环外创建ArrayList集合
        ArrayList list = new ArrayList();
        //    创建while开关
        boolean flag = true;
        while (flag) {
            // 1. 搭建主界⾯菜单
            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:");
            // 键盘输入功能
            int digital = sc.nextInt();
            //    使用switch将输入的功能实现
            switch (digital) {
                case 1:
                    addStudent(list);
                    break;
                case 2:
                    Remove(list);
                    break;
                case 3:
                    UpdateData(list);
                    break;
                case 4:
                    selectStudent(list);
                    break;
                case 5:
                    flag=false;
                    break;
                default:
                    System.out.println("输入有误");
                    break;
            }
        }
    }

    
    public static void addStudent(ArrayList list) {
        //        添加功能
        //        使用键盘录入将学生信息放入list集合
        Scanner sc = new Scanner(System.in);

        System.out.println("请输入学号:");
        String id = sc.next();

        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();

        Student stu = new Student(id, name, age, birthday);

        list.add(stu);
               

//去除重复的数据
for (int i = 0; i < list.size(); i++) {
    for (int j = i+1; j  

        System.out.println("添加成功");
    }

    
    public static void selectStudent(ArrayList list) {

        if (list.size() == 0) {
            System.out.println("暂无信息,请重试");
            //返回一个空值
            return;
        }
        System.out.println("学号tt姓名tt年龄tt⽣⽇");
        for (int i = 0; i < list.size(); i++) {
            Student stu = list.get(i);
            //字符串拼接
            System.out.println(stu.getId() + "t" + stu.getName() + "t"
                    + stu.getAge() + "tt" + stu.getBirthday());
        }
    }

    
    public static void Remove(ArrayList list) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入要删除的学生id:");
        String sid = sc.next();

        for (int i = 0; i < list.size(); i++) {
            //根据键盘输入的值,在list集合中进行判断,如果有就删除,没有返回
            if (list.get(i).getId().equals(sid)) {
                list.remove(i);
            }
        }
    }

    
    public static void UpdateData(ArrayList list) {
        //    1.先创建要更新的信息 使用scanner
        Scanner sc = new Scanner(System.in);

        System.out.println("请输入要修改的学号:");
        String id = sc.next();
        //    2.遍历数组
        for (int i = 0; i < list.size(); i++) {
            //    3.判断要修改的学生是否存在
            if (list.get(i).getId().equals(id)) {
                //    4.存在的话创建Student对象,获取原本信息
                System.out.println("请输入新的姓名:");
                String name = sc.next();

                System.out.println("请输入新的年龄:");
                int age = sc.nextInt();

                System.out.println("请输入新的生日:");
                String birthday = sc.next();
                //    5.更改信息
                list.get(i).setName(name);
                list.get(i).setAge(age);
                list.get(i).setBirthday(birthday);
            }
        }
    }
    public static void StopClose(){
        boolean flag=false;
    }
}
有些注释写的不太好有建议可以评论告诉我,我现在也属于学习进步阶段,感谢大家