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blessed s1r
Asked:2020-05-16 00:04:57 +0000 UTC2020-05-16 00:04:57 +0000 UTC

查找所有偶数数组元素的总和和奇数数组元素的总和

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开始学习java。收到这样的任务“找到所有偶数和奇数数组元素的和”。我最终写了这段代码。但 IDEA 抛出错误“线程“主”java.lang.IndexOutOfBoundsException 中的异常：索引：2，大小：2”。我无法输入为什么以及如何解决它。此外，应该落入动态数组的数字甚至落入奇数，反之亦然。我希望有人回答:)

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class task7 {
    public static void main(String[] args) {
        int[] a;
        Scanner z = new Scanner(System.in);
        System.out.println("Enter the number of elements in the array");
        int n = z.nextInt();
        a = new int[n];
        for (int i = 0; i <= (n - 1); i++) { //Принимаем все числа массива
            Scanner x = new Scanner(System.in);
            System.out.println("Enter" + " " + i + " " + "number of the array");
            int b = x.nextInt();
            a[i] = b;
        }



        List<Integer> even = new ArrayList<Integer>();
        List<Integer> odd = new ArrayList<Integer>();
        for(int i = 0; i< n; i++){
            if (a[i]%2==0) {
                even.add(i);
            }
            else {
                odd.add(i);
         }
        }
        int sumEven = 0;
        int sumOdd = 0;
        for (int i = 0; i < n; i++){
            sumEven +=odd.get(i);
        }
        for (int i = 0; i < n; i++){
          sumOdd+=even.get(i);
        }
        System.out.println("Array of even numbers is: " + even);
        System.out.println("The sum of even numbers is " + sumEven);
        System.out.println("Array of odd numbers is: " + odd);
        System.out.println("The sum of odd numbers is " + sumOdd);
    }

}

java

1 个回答

  1. Best Answer
    import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        System.out.println("Enter the number of elements in the array");
        int command = s.nextInt();
        int numbers[] = new int[command];
        for (int i = 0; i < numbers.length; i++) { //Принимаем все числа массива
            System.out.println("Enter" + " " + i + " " + "number of the array");
            numbers[i] = s.nextInt();
        }

        List<Integer> even = new ArrayList<Integer>();
        List<Integer> odd = new ArrayList<Integer>();
        for (int i = 0; i < numbers.length; i++) {
            if (numbers[i] % 2 == 0) {
                even.add(numbers[i]);
            } else {
                odd.add(numbers[i]);
            }
        }

        int sumEven = 0;
        int sumOdd = 0;
        for (int i = 0; i < even.size(); i++) {
            sumEven += even.get(i);
        }
        for (int i = 0; i < odd.size(); i++) {
            sumOdd += odd.get(i);
        }

        System.out.println("Array of even numbers is: " + even);
        System.out.println("The sum of even numbers is " + sumEven);
        System.out.println("Array of odd numbers is: " + odd);
        System.out.println("The sum of odd numbers is " + sumOdd);
    }
}

    无需声明 2 个扫描仪，一个可以在课堂上的任何地方使用。学习 Forech 循环，它将有助于迭代数组（我自己没有使用它，所以您可以理解代码）。我建议给变量提供逻辑名称（而不是“a、b、n、x 等），这样您自己和其他人就不会迷失在代码中。如果您对我的代码有疑问，请不要怕羞。

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