Java学生管理系统（简易）

最新推荐文章于 2025-12-09 16:25:48 发布

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本文介绍了一个简单的学生信息管理系统的设计与实现，包括添加、删除、修改和查询学生信息等功能。系统使用Java语言开发，通过命令行界面与用户交互。

Student.java

public class Student {
    private String id;
    private String name;
    private int age;
    private String address;

    public Student() {
    }

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

    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 int getAge() {
        return age;
    }

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

    public String getAddress() {
        return address;
    }

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

StudenSystem.java

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

public class StudentSystem {
    public static void main(String[] args) {
        ArrayList<Student> list = new ArrayList<>();
        loop:while (true) {
            System.out.println("-------------欢迎-------------");
            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.查询学生");
            System.out.println("5.退出系统");
            System.out.println("输入选择:");
            Scanner sc = new Scanner(System.in);
            String choose = sc.next();

            switch (choose){
                case "1" -> addStudent(list);
                case "2" -> deleteStudent(list);
                case "3" -> updataStudent(list);
                case "4" -> queryStudent(list);
                case "5" -> {
                    System.out.println("退出系统");
                    break loop;
                }
                default -> System.out.println("没有这个选项");
            }
        }
    }

    //添加
    public static void addStudent(ArrayList<Student> list){
        Student s = new Student();

        Scanner sc = new Scanner(System.in);
        System.out.println("输入学生id:");
        String id = null;
        while(true){
            id = sc.next();
            boolean flag = contain(list,id);
            if(flag){
                System.out.println("id已存在，重新输入");
            }else{
                s.setId(id);
                break;
            }
        }

        s.setId(id);

        System.out.println("输入学生姓名:");
        String name = sc.next();
        s.setName(name);

        System.out.println("输入学生地址:");
        String address = sc.next();
        s.setAddress(address);

        list.add(s);
        System.out.println("学生信息添加成功");
    }
    //删除
    public static void deleteStudent(ArrayList<Student> list){
        Scanner sc = new Scanner(System.in);
        System.out.println("输入要删除的id");
        String id = sc.next();
        int index = getIndex(list,id);
        if(index >= 0){
            list.remove(index);
            System.out.println("id为" + id + "的学生删除成功");
        }else{
            System.out.println("id不存在，删除失败");
        }
    }
    //修改
    public static void updataStudent(ArrayList<Student> list) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入要修改学生的id");
        String id = sc.next();

        int index = getIndex(list,id);
        if (index == -1){
            System.out.println("id不存在");
            return;
        }
        Student st = list.get(index);

        System.out.println("输入要修改的学生姓名");
        String newName = sc.next();
        st.setName(newName);

        System.out.println("输入要修改的学生地址");
        String newAddress = sc.next();
        st.setAddress(newAddress);

        System.out.println("学生信息修改成功");
    }
    //查询
    public static void queryStudent(ArrayList<Student> list){
        if(list.size()==0){
            System.out.println("无学生信息");
            return;
        }
        //打印表头信息
        System.out.println("id\t\t姓名\t\t住址\t");
        for (int i = 0; i < list.size(); i++) {
            Student stu = list.get(i);
            System.out.println(stu.getId() + "\t\t" + stu.getName() + "\t\t" + stu.getAddress());
        }
    }
    //判断id唯一
    public static boolean contain(ArrayList<Student> list,String id){
        //遍历list
        //对id判断
//        for (int i = 0; i < list.size(); i++) {
//            Student stu = list.get(i);
//            String sid = stu.getId();
//            if(sid.equals(id)){
//                return true;
//            }
//        }
//        return false;
        return getIndex(list,id) >= 0;
    }

    //通过id获取
    public static int getIndex(ArrayList<Student> list,String id){
        for (int i = 0; i < list.size(); i++) {
            Student st = list.get(i);
            String sid = st.getId();
            if(sid.equals(id)){
                return i;
            }
        }
        return -1;
    }
}