需要输入数组直到用户输入0 JAVA [英] Need To Take Input To Array Until User Enters 0 JAVA

问题描述

我需要帮助理解如何编写一个接受一定数量整数的for循环（必须是1到10）并且一旦输入0就停止接收数字（0将是最后一个数字）。到目前为止我的代码是：

I need help understanding how to write a for loop that takes in a certain amount of integers (must be 1 through 10) and it stops taking in numbers once 0 is entered (0 will be the last number). My code so far is:

   import java.util.Scanner;
   public class countNum {

      public static void main(String[] args) {

        int[] array;

        Scanner input = new Scanner(System.in);
        System.out.println ("Enter in numbers (1-10) enter 0 when finished:");

        int x = input.nextInt();

        while (x != 0) {
          if (x > 2 && x < 10) {
          //Don't know what to put here to make array[] take in the values
          }
          else
          //Can I just put break? How do I get it to go back to the top of the while loop?
        }
      }   

     }

}

我不明白如何同时初始化具有设定长度的数组，同时让扫描仪读取该未知长度的一定数量的数字，直到输入0，并且然后循环停止接收数组的输入。

I don't understand how to simultaneously initialize an array with a set length while having the Scanner read a certain amount of digits of that unknown length, until 0 is entered, and then the loop stops taking in input for the array.

感谢您的帮助！

推荐答案

好了这里更详细一点： -

Ok here's the bit more detail: -

• 你需要使用 ArrayList 如果你想要一个动态增加的数组。你这样做： -

• You need to use an ArrayList if you want a dynamically increasing array. You do it like this: -

List<Integer> numbers = new ArrayList<Integer>();

现在，在上面的代码中，您可以输入号码在while循环中读取语句（ nextInt ），因为你想要定期阅读它。并在while循环中放入一个条件来检查输入的数字是否为int： -

Now, in your above code, you can put your number reading statement (nextInt) inside the while loop, since you want to read it regularly. And put a condition in while loop to check whether the entered number is an int or not: -

int num = 0;
while (scanner.hasNextInt()) {
    num = scanner.nextInt();
}

此外，您可以自行搬家。只需检查数字是否为 0 。如果它不是 0 ，则将其添加到 ArrayList ： -

Further, you can move on your own. Just check whether the number is 0 or not. If it is not 0, then add it to ArrayList: -

numbers.add(num);

如果 0 ，请打破退出你的while循环。

If its 0, break out of your while loop.

你不需要 x！= 0 条件你的while循环，因为你已经在循环中检查了它。

And you don't need that x != 0 condition in your while loop, as you are already checking it inside the loop.

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