Java:随机类建议

Question

所以我应该创建一个程序，生成 100 个介于 1 和 1000 之间的随机整数，然后告诉返回偶数和奇数的整数的数量。到目前为止，我已经把那部分记下来了。但是，我无法弄清楚第二部分。我需要做同样的事情 10 次，然后我需要将所有这些加在一起得到总数。

import java.util.Random;

public class EvenOrOdd
{
  public static void main(String[] args)
  {
    int even = 0, odd = 0;
    int iteration = 0;

    while (iteration<10)
    {
      for(int i = 0; i<100;i++)
      {
        int number2 = random.nextInt(1000) + 1;
        if ((number2 % 2) == 0)
        {
          even++;
        }
        else if ((number2 % 2) == 1)
        {
          odd++;
        }

      }
      System.out.println("Iteration " + " Evens " + " Odds");
        iteration++;
      System.out.println(iteration + "          " + even + "     " + odd);
        iteration++;
      System.out.println(iteration + "          " + even + "     " + odd);
        iteration++;
      System.out.println(iteration + "          " + even + "     " + odd);
        iteration++;
      System.out.println(iteration + "          " + even + "     " + odd);
        iteration++;
      System.out.println(iteration + "          " + even + "     " + odd);
        iteration++;
      System.out.println(iteration + "          " + even + "     " + odd);
        iteration++;
      System.out.println(iteration + "          " + even + "     " + odd);
        iteration++;
      System.out.println(iteration + "          " + even + "     " + odd);
        iteration++;
      System.out.println(iteration + "          " + even + "     " + odd);
        iteration++;
      System.out.println(iteration + "         " + even + "     " + odd);
    }
    System.out.println("\nEvens: " + even + "\nOdds:  " + odd);
  }
}

我试过取出

System.out.println("Iteration " + " Evens " + " Odds");

并将它放在 while 循环之上，然后删除除其中一个之外的所有内容

    iteration++;
  System.out.println(iteration + "          " + even + "     " + odd);

但是当我这样做时，我的偶数和赔率在每次迭代中几乎翻了一番。

所以再重复一遍我想做的事:我想做每一个

    iteration++;
  System.out.println(iteration + "          " + even + "     " + odd);

显示新的偶数和奇数，而不是同一个。然后，因为我也不知道该怎么做，所以我想把十个偶数和十个赔率加起来。感谢您的帮助!

Answer 1

您几乎就在那里，主要问题是您在 while 循环内将迭代递增 10 次，因此它会立即退出 while 循环。我刚刚删除了所有这些增量，它起作用了!

此外，在 while 循环外有一个偶数和奇数的总计数器，然后在 while 循环中的每次迭代后将总数相加，如下所示:

public class EvenOrOdd {

    public static void main(String[] args) {

        Random random = new Random();
        int evenTotal = 0, oddTotal = 0;
        int iteration = 0;

        System.out.println("Iteration " + " Evens " + " Odds");

        while (iteration < 10) {
            int even = 0, odd = 0;
            for (int i = 0; i < 100; i++) {
                int number2 = random.nextInt(1000) + 1;
                if ((number2 % 2) == 0)
                    even++;
                else if ((number2 % 2) == 1)
                    odd++;

            }
            iteration++;
            System.out.println(iteration + "          " + even + "     " + odd);
            evenTotal += even;
            oddTotal += odd;
        }
        System.out.println("\nEvens: " + evenTotal + "\nOdds:  " + oddTotal);
    }

}