How to create new array without elements in certain range?

So I have a first and last variable which is the starting and ending markers that I want to get rid of. So the starting input for example would be [5, 10, 15, 20, 25] And say first = 1 and last = 3. The would mean that the elements 10, 15, and 20 would not be included in the new array since they are at the indexes between 1-3, inclusive, so that new array without those nums would be the output. Here’s what I have so far:

int [] newArr = new int[arr.length - (last - first) - 1];
for (int i = 0; i < newArr.length; i++) {
     if (i < first || i > last) {
          newArr[i] = arr[i];
     }
} 

They’re just changing to 0’s, and for some reason I can’t think of what to do next.

Answer

The simplest approach is probably just to keep track of a separate index for where you are inserting elements into the new array.

int [] newArr = new int[arr.length - (last - first) - 1];
for (int i = 0, j = 0; i < arr.length; i++) {
     if (i < first || i > last) {
          newArr[j++] = arr[i];
     }
}