13.控制台命令行学生管理系统

package com.itheima.domain;

public class Student {
    private String sid;//学号
    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;
    }
}

package com.itheima.test;

import com.itheima.domain.Student;

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

public class StudentManager {
    public static void main(String[] args) {

        ArrayList<Student> list=new ArrayList<>();
        
        Scanner sc=new Scanner(System.in);
        lo:while (true){
            String s = stuManager(sc,list);
            if (s.equals("5")){
                break lo;
            }
        }


    }

    private static String stuManager(Scanner sc,ArrayList<Student> list) {

        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 choise = sc.next();
        switch (choise){
            case "1":
                System.out.println("添加学生");
                 addStudent(list);
                break;
            case "2":
                System.out.println("删除学生");
                deleStudent(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("退出");
                System.out.println("感谢您的使用！");
                break;
            default:
                System.out.println("您的输入有误");
                break;
        }
        return choise;
    }

    public static void updateStudent(ArrayList<Student> list) {
        System.out.println("请输入你要修改的学生的学号");
        Scanner sc=new Scanner(System.in);
        String updateSid = sc.next();
        int index=getIndex(list,updateSid);
        if (index==-1){
            System.out.println("查无信息，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();
            Student stu=new Student(updateSid,name,age,birthday);
            list.set(index,stu);
            System.out.println("修改成功！");
        }
    }

    private static void deleStudent(ArrayList<Student> list) {
        System.out.println("请输入你要删除的学生的学号");
        Scanner sc=new Scanner(System.in);
        String deleteSid = sc.next();
        int index=getIndex(list,deleteSid);
        if (index==-1){
            System.out.println("查无信息，请重新输入");
        }else {
            list.remove(index);
            System.out.println("删除成功！");
        }
    }

    public 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"+stu.getName()+"\t"+stu.getAge()+"\t"+stu.getBirthday());
        }
    }

    public 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){
                break;
            }
        }

        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(sid,name,age,birthday);
        list.add(stu);
        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);
            String id = stu.getSid();
            if (id.equals(sid)){
                index=i;
            }
        }
        return index;
    }
}