Student management system [java version]

The system supports

1. Add students
2. Delete students
3. Modify students
4. View all students
5. Exit the system

Define Student class

package StudentSystem;

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

    public Student() {
    
    
    }

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

    public String getName() {
    
    
        return name;
    }

    public void setName(String name) {
    
    
        this.name = name;
    }

    public String getId() {
    
    
        return id;
    }

    public void setId(String id) {
    
    
        this.id = id;
    }

    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;
    }
}

Design student management system

package StudentSystem;

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

public class StudentManager {
    
    
    public static void main(String[] args) {
    
    
        ArrayList<Student> arrayList = new ArrayList<Student>();
        while (true) {
    
    
            System.out.println("-----------欢迎来到学生管理主界面-----------");
            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.查看所有学生");
            System.out.println("5.退出系统");
            System.out.println("请输入你的选择：");
            Scanner reader = new Scanner(System.in);
            String opt = reader.nextLine();
            switch (opt) {
    
    
                case "1":
                    System.out.println("添加学生");
                    addStudent(arrayList);
                    break;
                case "2":
                    System.out.println("删除学生");
                    removeStudent(arrayList);
                    break;
                case "3":
                    System.out.println("修改学生");
                    updateStudent(arrayList);
                    break;
                case "4":
                    System.out.println("查看所有学生");
                    askStudent(arrayList);
                    break;
                case "5":
                    System.out.println("成功退出系统！感谢使用！");
                    System.exit(0);
            }
        }
    }


    public static void addStudent(ArrayList<Student> arrayList) {
    
    
        Scanner reader = new Scanner(System.in);
        String id;
        while (true) {
    
    
            System.out.println("请输入学生id：");
            id = reader.nextLine();
            int flag = 0;
            for (int i = 0; i < arrayList.size(); i++) {
    
    //复习一下基础for循环查询
                Student stu = arrayList.get(i);
                if (stu.getId().equals(id)) {
    
    
                    System.out.println("该学号信息已被占用！请重新检查输入！");
                    flag = 1;
                    break;
                }
            }
            if (flag == 0) break;
        }

        System.out.println("请输入学生姓名：");
        String name = reader.nextLine();
        System.out.println("请输入学生年龄：");
        String age = reader.nextLine();
        System.out.println("请输入学生地址：");
        String address = reader.nextLine();

        Student stu = new Student();
        stu.setName(name);
        stu.setAddress(address);
        stu.setAge(age);
        stu.setId(id);
        arrayList.add(stu);

    }

    public static void askStudent(ArrayList<Student> arrayList) {
    
    
        if (arrayList.size() == 0) {
    
    
            System.out.println("无学生，请先添加！");
            return;
        }
        System.out.println("学号\t\t\t姓名\t\t年龄\t\t住址");
        for (Student stu : arrayList) {
    
    
            System.out.println(stu.getId() + "\t" + stu.getName() + "\t" + stu.getAge() + "岁\t\t" + stu.getAddress());
        }
    }

    public static void removeStudent(ArrayList<Student> arrayList) {
    
    
        Scanner reader = new Scanner(System.in);
        System.out.println("请输入要删除的学生学号：");
        String sid = reader.nextLine();
        int flag = 0;
        for (int i = 0; i < arrayList.size(); i++) {
    
    
            Student stu = arrayList.get(i);
            if (stu.getId().equals(sid)) {
    
    
                arrayList.remove(i);
                flag = 1;
                break;
            }
        }
        if (flag == 0) System.out.println("没有该学生信息！请检查输入！");
        else System.out.println("删除成功！");
    }

    public static void updateStudent(ArrayList<Student> arrayList) {
    
    
        Scanner reader = new Scanner(System.in);
        System.out.println("请输入要修改的学生学号：");
        String sid = reader.nextLine();
        int flag = 0;
        for (Student stu : arrayList) {
    
    //增强for
            if (stu.getId().equals(sid)) {
    
    
                System.out.println("请输入要修改的学生新姓名：");
                String name = reader.nextLine();
                System.out.println("请输入要修改的学生新年龄：");
                String age = reader.nextLine();
                System.out.println("请输入要修改的学生新住址：");
                String address = reader.nextLine();
                flag = 1;
                stu.setName(name);
                stu.setAddress(address);
                stu.setAge(age);
            }
        }
        if (flag == 0) System.out.println("没有该学生信息！请检查输入！");
        else System.out.println("修改成功！");
    }
}