# How to create an array of numbers from (1 to x)?

Running on JDK 16. Originally tried to figure out how to create an array of numbers like `range(1,x+1)` in python.

Tried to use the built in help in VSC to no avail, then switched to IntelliJ and that made me even more confused without the intellisense of VSC. Searched google for two hours straight trying stuff like `instream` and then converting to an array, but failed. Tried type-casting to int[] but that didn’t work either. Haven’t been able to figure it out even with the smart sense of W3Schools and searching here for an hour..

The problem: I want to create an array of numbers from 1 to x. Let’s say x is equal to 25. Then, i’d like to iterate through them one by one in a for loop. Inside the four loop, I want to cube it by three and build a dynamic array that has ‘x’ slots. (So, 25 in this instance.)

Here’s what i’ve tried so far:

```import java.util.Scanner;
import java.util.stream.Collectors;
import java.util.stream.IntStream;

public class cubeNums {
public static void someVoidMethod() {
Scanner scan = new Scanner(System.in);
// take in x val
int x = scan.nextInt();
// create int[] array to iterate thru for loop
list numList = (IntStream.range(-2, 10)).boxed().collect(Collectors.toList());

for (int[] numArray = new int[15]) {
//incomplete
}

}

}
```

This is just the latest attempt I have of the code, after re-writing it a bunch and having no luck..

You can create range from x to y, using stream `range`, then you can replace generated values with `map` and put these values to an array using `toArray`

```public static void main(String[] args) {
int[] arr = IntStream.range(1, 25).map(x -> (int) Math.pow(x, 3)).toArray();
System.out.println(Arrays.toString(arr));
}
```

If you want to get a list, you first need to box the numbers with `boxed` and call `collect`

```List<Integer> list = IntStream
.range(1, 25)
.map(x -> (int) Math.pow(x, 3))
.boxed()
.collect(Collectors.toList());

System.out.println(list);
```

Output

```[1, 8, 27, 64, 125, 216, 343, 512, 729, 1000, 1331, 1728, 2197, 2744, 3375, 4096, 4913, 5832, 6859, 8000, 9261, 10648, 12167, 13824]
```