java - 数组困惑

Question

我不是一名 get 程序员，我的代码一直存在问题。我收到错误:

`java.lang.ArrayIndexOutOfBoundsException: 0`

一些帮助将不胜感激。谢谢。

我的代码:

    import java.util.Scanner;
public class Gradebook1D {

  public static void main(String[] args) { 
    Scanner input = new Scanner(System.in);
    int[] id = new int[0];
    double[] quiz1 = new double[0];
    double[] quiz2 = new double[0];
    double[] quiz3 = new double[0];

    int idStudent = 0;
    System.out.print("Enter how student's are in your class: ");
    idStudent = input.nextInt();

    double[] sum = new double[0];
    for (int i = 0; i < idStudent; i++){
      System.out.println("Enter student ID: ");
      id[i] = input.nextInt();

      System.out.print("\n Enter score for Quiz1: ");
      quiz1[i] = input.nextInt();

      System.out.print("\n Enter score for Quiz2: ");
      quiz2[i] = input.nextInt();

      System.out.print("\n Enter score for Quiz3: ");
      quiz3[i] = input.nextInt();

      sum[i] = quiz1[i] + quiz2[i] + quiz3[i];
    }
  }
}

Answer 1

使用idStudent初始化id、quiz1、quiz2、quiz3，如下所示

int[] id = new int[idStudent];
double[] quiz1 = new double[idStudent];
double[] quiz2 = new double[idStudent];
double[] quiz3 = new double[idStudent];

该错误的原因是您声明数组大小为零。您无法将元素插入到大小为零的数组中