java - ArrayIndexOutOfBoundsException 计算平均值

Question

我正在编写 Randall S. Fairman 编写的《3D Astronomy with Java》一书，我自己对 Java 的经验有限。他使用这个 LineReader 类而不是 Scanner 或任何其他类来获取用户输入。我正在进行的练习要求您使用 LineReader 获取数组的值并查找数组中值的平均值。这是我想出来的，我尽力了，但还是不行。当我尝试运行它时，它说

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 1
at Average.main(Average.java:10) 

代码:

import ui.LineReader;

public class Average {

  public static void main(String[] args) {
     int average;
     int sum = 0;
  for (int j = 0; j < 5; j++) {
    int i = LineReader.queryInt("Give me a number: ");
    int [] M = new int [i];
    sum = sum + M[i];
}
    average = sum/5;
    System.out.println("The average of those numbers is " +average);

    }
}

Answer 1

您不需要 int[]M = new int[i]; 行。

只需执行sum += i;

您更新的代码:

import ui.LineReader;

public class Average {

   public static void main(String[] args) {
     int average;
     int sum = 0;

     for (int j = 0; j < 5; j++) {
        int i = LineReader.queryInt("Give me a number: ");
        sum += i;
     }

     average = sum/5;
     System.out.println("The average of those numbers is " +average);

   }
}