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What causes a java.lang.ArrayIndexOutOfBoundsException and how do I prevent it?（24回答）
昨天关门了。

package myMethods;

import java.util.Scanner;

public class CalculationsOnArrays {

  public static void main(String args[]) {

  Scanner input = new Scanner(System.in); 

  int x ;

  System.out.println("How many numbers are in the array");

  int N = input.nextInt();

  int[] arr = new int [N] ;

  System.out.println("Enter the numbers") ; 

    for (x = 0; x < N; x++) {

      arr[x] = input.nextInt();

   } 

    double average = 0 ;

    int count_negative_elements = 0;

    // calling method

    AVER(arr, average, count_negative_elements, N, x);

    input.close();

  }

  static void AVER(int[] arr, double average, int count_negative_numbers, int N, int x) // passing parameters to the method

      {

   int sum = 0, count = 0, negative_numbers = 0 ;

   sum += arr[x] ;

   average = sum / N;

System.out.println("The average of the numbers is " + average);

  if (arr[x] < 0) {

      count++ ; 

   negative_numbers = arr[x] ;

System.out.println("The negative numbers in the array are " + count);

System.out.println("They are " + negative_numbers) ;

    }

  }
 

}

我想在1D数组上做一些计算。