java - 如何从不同的数组中找到与数组的最大编号相关的索引？

Question

这就是我目前拥有的代码。首先，当它计算所有值的平均值时，我不断遇到退出代码。我不知道为什么会发生这种情况，因为它之前工作正常，我一直在编辑它以使其恢复到之前的状态，但我不断收到退出代码。

之后，我无法显示数组中的最大值，也无法显示与之相关的城市......如果有人能帮助我那就太好了!

public class Main {

  public static void main(String[] args) {

    System.out.println("- - - - - - - - - - - - - - - ");
    System.out.println("City\t\tPopulation\t\t\t");
    System.out.println("- - - - - - - - - - - - - - - ");

    int[] population = {
      693417,
      457502,
      109985,
      107360,
      103773,
      13145,
      5469
    };
    String[] cities = {
      "Denver",
      "Colo Springs",
      "Pueblo",
      "Boulder",
      "Greely",
      "Fruita",
      "Vail"
    };


    displayPopulations(population, cities);

    int[] total = computeTotalPopulation(population);
    for (int i = 0; i < total.length; i++);

    double[] average = computeAveragePopulation(population);
    for (int i = 0; i < average.length; i++);



  }


  public static void displayPopulations(int[] population, String[] cities) {

    System.out.println(cities[0] + "\t\t" + population[0]);
    System.out.println(cities[1] + "\t" + population[1]);
    System.out.println(cities[2] + "\t\t" + population[2]);
    System.out.println(cities[3] + "\t\t" + population[3]);
    System.out.println(cities[4] + "\t\t" + population[4]);
    System.out.println(cities[5] + "\t\t" + population[5] + "\n");
  }


  public static int[] computeTotalPopulation(int[] population) {

    int[] population2 = {
      693417,
      457502,
      109985,
      107360,
      103773,
      13145,
      5469
    };
    int sum = 0;
    for (int i = 0; i < population2.length; i++) {
      sum += population2[i];
    }

    System.out.println("Total population for all cities is: " + sum);
    return population2;

  }

  public static double[] computeAveragePopulation(int[] population) {

    double[] population3 = {
      693417,
      457502,
      109985,
      107360,
      103773,
      13145,
      5469
    };
    double sum = 0;
    for (int i = 0; i < population3.length; i++) {
      sum = sum + population3[i];
    }

    double averagePopulation = sum / population3.length;
    System.out.printf("Average population for all cities is: %.2f", averagePopulation + "\n");
    return population3;

  }
}

Answer 1

您应该为computeTotalPopulation方法返回int sum，为computeAveragePopulation方法返回double averagePopulation，而不是返回数组。这是我给你的最大提示，剩下的你必须自己弄清楚。