一、学生类

首先创建一个学生类，定义学号姓名年龄居住地

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

//构造函数
    public Student(String id, String name, String 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 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;   }

二、测试类

1、界面实现

在实现类里面写界面格式，选项以及方法的实现

ArrayList<Student> array = new ArrayList<>();
        while (true) {
            System.out.println("-----------欢迎来到学生管理系统----------");
            System.out.println("1、查询学生");
            System.out.println("2、添加学生");
            System.out.println("3、删除学生");
            System.out.println("4、退出");
            System.out.println("请输入你的选择：");
            Scanner sc=new Scanner(System.in);
            String choice=sc.nextLine();

2、功能选择

exit能够直接关闭java虚拟机

  //选择
            switch(choice){
                case "1":
                    findAllStudent(array);
                    break;
                case "2":
                    addAllStudent(array);
                    break;
                case "3":
                    deleteAllStudent(array);
                    break;
                case "4":
                    System.out.println("谢谢你的使用");
                    System.exit(0);
                    break;
                default:
                    System.out.println("输入号码有误，请重新输入");
                    break;
            }

3、方法实现

查询方法

public static void findAllStudent(ArrayList<Student> array){
        if(array.size()==0){
            System.out.println("无该学生信息，请重新输入");
            return;
        }
        for(int x=0;x<array.size();x++){
            Student s=array.get(x);
            System.out.println("学号："+s.getId()+"\t"+" 姓名："+s.getName()+"\t"+"年龄："+s.getAge()+"\t"+" 居住地："+s.getAddress());
        }
    }

添加

 public static void addAllStudent(ArrayList<Student>array){
         Scanner sc=new Scanner(System.in);
         String id;
         while(true){
             System.out.println("请输入学生学号：");
             id=sc.next();
             boolean flag=false;
             for(int x=0;x<array.size();x++){
                 Student s=array.get(x);
                 if(s.getId().equals(id)){
                     flag=true;
                     break;
                 }

             }
             if(flag){
                 System.out.println("您输入的学号被占用，请重新输入");

             }
             else{
                 break;
             }
         }
        System.out.println("请输入学生姓名：");
        String name=sc.next();
        System.out.println("请输入学生年龄：");
        String age=sc.next();
        System.out.println("请输入学生居住地：");
        String address=sc.next();

        Student s=new Student(id,name,age,address);
        array.add(s);
        System.out.println("添加学生成功");
    }

删除

 public static void deleteAllStudent(ArrayList<Student>array){
        Scanner sc=new Scanner(System.in);
        System.out.println("请输入您要删除的学生学号：");
        String id=sc.nextLine();
        int index=-1;
        for(int x=0;x< array.size();x++){
            Student s=array.get(x);
            if(s.getId().equals(id)){
                index=x;
                break;
            }
        }
        if(index==-1){
            System.out.println("该学生不存在");
        }
        else{
            array.remove(index);
            System.out.println("删除成功");
        }
    }