java - 需要为用户生成每个学生的卷号吗？

Question

我需要从每个学生那里获得唯一的卷号。

package test;

import java.util.Scanner;

public class Studentform {

    public static void main(String[] args) {

        int length = 3;

        Studb[] studs = new Studb[length];

        for (int i = 0; i < length; i++) {
            for (Studb s : studs) {
                readStudent(i);

            }
        }

    }

    static void readStudent(int i) {
        int rollno = 1001;
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter your name:");
        String name = sc.next();
        System.out.println("Enter your age:");
        int age = sc.nextInt();
        Studb stud = new Studb(name, age, rollno++);
        System.out.println(stud);

    }
}

Answer 1

只要传递它，它最终也会是唯一的。如下:

static void readStudent(int i) {
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter your name:");
        String name = sc.next();
        System.out.println("Enter your age:");
        int age = sc.nextInt();
        Studb stud = new Studb(name, age, i);
        System.out.println(stud);

    }

或者您可以在 rollno 中添加 i 值，如下所示:

static void readStudent(int i) {
        int rollno = 1000+i;
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter your name:");
        String name = sc.next();
        System.out.println("Enter your age:");
        int age = sc.nextInt();
        Studb stud = new Studb(name, age, rollno);
        System.out.println(stud);

    }