如何在没有循环的情况下顺序填充数组或arraylist？

I'm surprised I haven't found an answer to this anywhere. I want to fill an int array of 100 with 1..100. Fill is a good method but it doesn't increment the value each turn. Its obvious how to do it with a loop but I want to avoid that due to my maximum value being extremely high. Is there any api method which can do this for me?

我很惊讶我在任何地方都找不到答案。我想用1..100填充100的int数组。填充是一种很好的方法，但它不会在每个回合中增加值。很明显如何使用循环，但我想避免这种情况，因为我的最大值非常高。有没有api方法可以为我做这个？

2 个解决方案

#1

1. There is no method in the standard library that will do this.

   标准库中没有方法可以执行此操作。

2. Even if there was, it would need to use a loop under the hood.

   即使有，也需要在引擎盖下使用一个循环。

3. I don't see the significance of "my maximum value being extremely high". That should make no difference to the decision to use a loop ... or not.

   我没有看到“我的最大价值极高”的意义。这对使用循环的决定没有任何影响......或者不是。

4. Don't use recursion. Java does not implement tail call optimization so 1) it will be slower than using a loop and 2) you risk getting *Error if the array or list is large. (Yes, I know it is not large in the question as asked ...)

   不要使用递归。 Java没有实现尾调用优化，因此1）它比使用循环慢，2）如果数组或列表很大，你可能会遇到*Error。 （是的，我知道问题并不大......）

#2

Ooooh, use recursion!

哦，使用递归！

void to100(int[] array, int i, int v) {
    if( i < array.length ) {
        array[i] = v;
        to100( i+1, v+1 );
    }
}

int[] array = new int[100];

too100( array, 0, 1 );

enjoy.

请享用。