如何使用简单的for循环创建数组？

Question

I need to create an array that looks like this:

 [0,0,1,1,2,2,3,3,4,4....] 

Given my following code, how can I eliminate the counter ?

int[] SomeArray = new int[24];
int counter = 0;
for(int x = 0 ; x < SomeArray.length-1 ; x++){
    SomeArray[x] = counter;
    SomeArray{x+1] = counter;
    counter++;
}

Answer 1

In Java 8+, you could use an IntStream.range(int, int) and map each value as desired. Something like,

int[] someArray = IntStream.range(0, 24).map(x -> {
    return x / 2;
}).toArray();

Also, please follow Java variable naming conventions ( someArray , not SomeArray ).

If you have to use Java 7 (or earlier), then you can do it with something like

int[] someArray = new int[24];
for (int i = 0; i < someArray.length; i++) {
    someArray[i] = i / 2;
}

Answer 2

use increment x=x+2 as two indexes of array are being stored in every iteration

for(int x = 0 ; x < SomeArray.length-1 ; x+=2){
        SomeArray[x] = x/2;

        SomeArray[x+1] = x/2;
}