Java学习--学生管理系统(残破版)

代码

Main.java

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

public class Main {
    public static void main(String[] args) {
        ArrayList<Student> list = new ArrayList<>();
        loop:
        while (true) {
            System.out.println("-----欢迎来到阿宝院校学生管理系统-----");
            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.查询学生");
            System.out.println("5.退出系统");
            System.out.println("请输入您的选择:");
            Scanner sc = new Scanner(System.in);
            String choose = sc.next();
            switch (choose) {
                case "1" -> AddStudent(list);
                case "2" -> DeleteStudent(list);
                case "3" -> UpdateStudent(list);
                case "4" -> LookStudent(list);
                case "5" -> {
                    System.out.println("退出!");
                    break loop;
                }
                default -> System.out.println("没有这个选项!");
            }
        }
    }

    // 添加学生
    public static void AddStudent(ArrayList<Student> list) {
        System.out.println("添加学生!");
        Student s = new Student();
        Scanner sc = new Scanner(System.in);
        System.out.println("请录入id:");
        while (true) {
            String id = sc.next();
            boolean soleIds = soleId(list, id);
            if (soleIds) {
                System.out.println("该id已经存在!");
            } else {
                s.setId(id);
                break;
            }
        }
        System.out.println("请输入姓名:");
        String name = sc.next();
        s.setName(name);

        System.out.println("请输入年龄:");
        int age = sc.nextInt();
        s.setAge(age);

        System.out.println("请输入家庭住址:");
        String address = sc.next();
        s.setAddress(address);

        list.add(s);
    }

    //删除学生的信息
    public static void DeleteStudent(ArrayList<Student> list) {
        System.out.println("请输入要删除的学生id:");
        Scanner sc = new Scanner(System.in);
        String id = sc.next();
        // 查询有没有这个学生
        int indexValue = getIndex(list, id);
        if (indexValue >= 0) {
            list.remove(indexValue);
            System.out.println("删除成功!");
        } else {
            System.out.println("该id不存在!");
        }
    }

    //修改学生的信息
    public static void UpdateStudent(ArrayList<Student> list) {
        System.out.println("请输入要修改的学生id:");
        Scanner sc = new Scanner(System.in);
        String id = sc.next();
        // 查询有没有这个学生
        Boolean values = soleId(list, id);
        int indexValue = getIndex(list, id);
        if (values) {
            Student stu = list.get(indexValue);
            System.out.println("请输入要修改的姓名:");
            String name = sc.next();
            stu.setName(name);
            System.out.println("请输入要修改的年龄:");
            int age = sc.nextInt();
            stu.setAge(age);
            System.out.println("请输入要修改的家庭住址:");
            String address = sc.next();
            stu.setAddress(address);
            System.out.println("修改成功!");
        } else {
            System.out.println("该id不存在!");
        }
    }

    //查询学生的信息
    public static void LookStudent(ArrayList<Student> list) {
        //如果没有学生
        if (list.isEmpty()) {
            System.out.println("当前暂无学生,请先添加后再查询!");
            return;
        }
        System.out.println("id\t姓名\t年龄\t家庭住址");
        for (int i = 0; i < list.size(); i++) {
            Student stu = list.get(i);
            System.out.println(stu.getId() + "\t" + stu.getName() + "\t" + stu.getAge() + "\t" + stu.getAddress());
        }
    }

    //判断id是否唯一
    public static Boolean soleId(ArrayList<Student> list, String id) {
        for (int i = 0; i < list.size(); i++) {
            Student stu = list.get(i);
            String ids = stu.getId();
            if (ids.equals(id)) {
                return true;
            }
        }
        return false;
    }

    //获取集合中的索引
    public static int getIndex(ArrayList<Student> list, String id) {
        for (int i = 0; i < list.size(); i++) {
            Student stu = list.get(i);
            String ids = stu.getId();
            if (ids.equals(id)) {
                return i;
            }
        }
        return -1;
    }
}

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;
    }

    /**
     * 获取
     * @return id
     */
    public String getId() {
        return id;
    }

    /**
     * 设置
     * @param id
     */
    public void setId(String id) {
        this.id = id;
    }

    /**
     * 获取
     * @return name
     */
    public String getName() {
        return name;
    }

    /**
     * 设置
     * @param name
     */
    public void setName(String name) {
        this.name = name;
    }

    /**
     * 获取
     * @return age
     */
    public int getAge() {
        return age;
    }

    /**
     * 设置
     * @param age
     */
    public void setAge(int age) {
        this.age = age;
    }

    /**
     * 获取
     * @return address
     */
    public String getAddress() {
        return address;
    }

    /**
     * 设置
     * @param address
     */
    public void setAddress(String address) {
        this.address = address;
    }

}

效果图

主界面

增加和查询

删除