java学生信息管理系统（简易）

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

/**
 * 定义学生类
 * 主界页面编写
 * 添加学生
 * 查看学生
 * 删除学生
 * 修改学生
 */




public class Main {

    public static void main(String[] args) {

        //创建集合对象用于存储学生数据
        ArrayList<Student> array = new ArrayList<Student>();

        while(true){
            System.out.println("--------欢迎来到学生管理系统--------");
            System.out.println("1.添加学生信息");
            System.out.println("2.删除学生信息");
            System.out.println("3.查看学生信息");
            System.out.println("4.修改学生信息");
            System.out.println("5.退出系统");
            System.out.println("请输入你的选择：");


            Scanner s = new Scanner(System.in);
            String line = s.nextLine();
            switch (line){
                case "1":
//                    System.out.println("输入学生信息：");
                    addStudent(array);
                    break;
                case "2":
//                    System.out.println("删除");
                    delectStudent(array);
                    break;
                case "3":
//                    System.out.println("查看");
                    findAllStudents(array);
                    break;
                case "4":
//                    System.out.println("修改");
                    modifyStudent(array);
                    break;
                case "5":
                    System.out.println("退出");
                    return;
                default:
                    System.out.println("请输入正确选项：");
                    break;
            }

        }

    }

    public static void addStudent(ArrayList<Student> array){

        //提示输入的数据
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入学生id：");
        String id = sc.nextLine();
        System.out.println("请输入学生姓名：");
        String name = sc.nextLine();
        System.out.println("请输入学生性别：");
        String sex = sc.nextLine();
        System.out.println("请输入学生居住地址：");
        String address = sc.nextLine();
        System.out.println("请输入学生年龄：");
        String age = sc.nextLine();

        //创建对象，把数据赋值给对象
        Student s = new Student();
        s.setAge(age);
        s.setAddress(address);
        s.setId(id);
        s.setSex(sex);
        s.setName(name);

        //将对象添加到集合中
        array.add(s);

        //成功提示
        System.out.println("添加成功");


    }

    public static void findAllStudents(ArrayList<Student> array){

        if(array.size()==0){
            System.out.println("暂无信息，请先添加信息在查询");
            return;
        }
        //显示表头信息
        System.out.println("学号\t\t名字\t\t性别\t\t年龄\t\t居住地");
        //显示数据
        for (int i=0;i<array.size();i++){
            Student s = array.get(i);
            System.out.println(s.getId() + "\t\t" + s.getName() + "\t\t" +
                    s.getSex() + "\t\t" + s.getAge() + "岁" + "\t\t" + s.getAddress());
        }
    }

    public static void delectStudent(ArrayList<Student> array){
        Scanner s = new Scanner(System.in);
        System.out.println("请输入要删除的学生学号：");
        String id = s.nextLine();
        for(int i = 0;i<array.size();i++){
            Student stu = array.get(i);
            if(stu.getId().equals(id)){
                array.remove(i);
                break;
            }
        }

        System.out.println("删除成功");
    }

    public static void modifyStudent(ArrayList<Student> array){
//        Student stu = new Student();
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入要修改的学生id：");
        String line = sc.nextLine();

        for(int i=0;i<array.size();i++){
            Student stu = array.get(i);
            if (stu.getId().equals(line)){      //不能使用==比较，因为比较的是地址
                System.out.println("1.姓名\t2.年龄");
                System.out.println("3.性别\t4.住址");
                System.out.println("请输入要修改的信息序号：");
                String n = sc.nextLine();
                System.out.println("请输入修改后的信息：");
                String data = sc.nextLine();


                switch (n){
                    case "1":
                        stu.setName(data);
                        break;
                    case "2":
                        stu.setAge(data);
                        break;
                    case "3":
                        stu.setSex(data);
                        break;
                    case "4":
                        stu.setAddress(data);
                        break;
                }
                System.out.println("修改成功!");
                return;
            }
        }
        System.out.println("没有此学生！");






    }

}

上面是主函数，下面是学生类

public class Student {
    private String id;//学号
    private String name;//姓名
    private String sex; //性别
    private String age;    //年龄
    private String address; //居住地址

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

    public Student() {
    }

    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 String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    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;
    }
}