学生管理系统(ArraList)

需求

实现对学生信息的增删改查

实现步骤

​ 1.定义学生类

​ 2.搭建主界面

​ 3.添加学生功能实现

​ 4.查看学生功能实现

​ 5.删除学生功能实现

​ 6.修改功能实现

知识点

​ ArraList

​ Scanner

代码

​ Student

package com.wxit;

public class Student {

        private String sid;

        private String name;

        private  String age;

        private  String address;

        public Student() {
        }

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

        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 String getAge() {
            return age;
        }

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

        public String getAddress() {
            return address;
        }

        public void setAddress(String address) {
            this.address = address;
        }
    }

StudentManager

package com.wxit;

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

public class StudentManager {

    public static void main(String[] args){
        ArrayList<Student> array = new ArrayList<>();
        while (true) {
            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.print("请输入你的选择：");

            Scanner sc = new Scanner(System.in);
            String line = sc.nextLine();

            switch (line) {
                case "1":
//                    System.out.println("添加学生");
                    addStudent(array);
                    break;
                case "2":
//                    System.out.println("删除学生");
                    deleteStudent(array);
                    break;
                case "3":
//                    System.out.println("修改学生");
                    updateStudent(array);
                    break;
                case "4":
//                   System.out.println("查看所有学生");
                    findAllStudent(array);
                    break;
                case "5":
                    System.out.println("谢谢使用!");
                    System.exit(0);
            }
        }

    }


    public static void addStudent(ArrayList<Student> array){
        Scanner sc =new Scanner(System.in);

        String sid;
        while (true){
            System.out.print("请输入学生学号：");
            sid =sc.nextLine();

            boolean flag = isUsed(array,sid);
            if(flag){
                System.out.println("你的学号已经使用，请重新输入");
            }else {
                break;
            }
        }
        System.out.print("请输入学生姓名：");
        String name =sc.nextLine();
        System.out.print("请输入学生年龄：");
        String age =sc.nextLine();
        System.out.print("请输入学生居住地：");
        String address =sc.nextLine();

        Student s =new Student();
        s.setSid(sid);
        s.setName(name);
        s.setAge(age);
        s.setAddress(address);

        array.add(s);

        System.out.println("添加学生成功");
    }

    public static boolean isUsed(ArrayList<Student> array,String sid){
        boolean flag = false;
        for(int i=0;i<array.size();i++){
            Student s =array.get(i);
            if(s.getSid().equals(sid)){
                flag=true;
                break;
            }
        }
        return flag;
    }

    public static void findAllStudent(ArrayList<Student> array){
        if(array.size() ==0){
            System.out.println("无信息，请先添加信息再查询");
            // 让程序停止
            return;
        }


        System.out.println("学号\t\t姓名\t\t年龄\t\t居住地");
        for(int i=0;i<array.size();i++){
            Student s = array.get(i);
            System.out.println(s.getSid()+"\t"+ s.getName() +"\t\t"+s.getAge()+"岁\t"+s.getAddress());
        }
    }

    public static void deleteStudent(ArrayList<Student> array){
        Scanner sc = new Scanner(System.in);

        System.out.print("请输入你要删除的学号：");
        String sid = sc.nextLine();


        int index = -1;
        for(int i=0;i<array.size();i++){
            Student s=array.get(i);
            if(s.getSid().equals(sid)){
//                array.remove(i);
                index = i;
                break;

            }
        }
        if(index ==-1){
            System.out.println("该信息不存在，请重新输入");
        }else {
            array.remove(index);
            System.out.println("删除学生成功!");
        }

    }

    public static void updateStudent(ArrayList<Student> array){
        Scanner sc =new Scanner(System.in);

        System.out.print("请输入你要修改的学生学号：");
        String sid =sc.nextLine();

        System.out.print("请输入学生新姓名：");
        String name =sc.nextLine();
        System.out.print("请输入学生新年龄：");
        String age =sc.nextLine();
        System.out.print("请输入学生新住距地：");
        String address =sc.nextLine();

        Student s =new Student();
        s.setSid(sid);
        s.setName(name);
        s.setAge(age);
        s.setAddress(address);

        for(int i=0;i<array.size();i++){
            Student student=array.get(i);
            if(student.getSid().equals(sid)){
                array.set(i,s);
                break;
            }
        }
        System.out.println("修改学生成功！");
    }


}