Adding a range of numbers to a Java array

Question

I am relatively new to Java programming and am trying to create an array with values from (2017 - 3017).

I was wondering if there is a way to create an array and have it pre-filled with these values so instead of doing:

int[] anArray = {2017, 2018, 2019, 2020... 3017}

which seems extremely long-winded, I can simply define a range of integers I wish to add to the array.

I know there are similar question to this one on the site, however none of them have answers that help me.

Thanks!

Edit: I forgot to mention I am using Java 7 and therefore cannot use IntStream.

There are lot of ways. Did you write anything at all? – Pritam Banerjee Jun 16 '17 at 09:19 — Pritam Banerjee, Jun 16 '17 at 09:19

Rogue · Accepted Answer · 2017-06-16T09:28:00.837

6

How about this:

int[] anArray = IntStream.rangeClosed(2017, 3017).toArray(); //closed includes upper bound

Java 7 would simply require a loop to fill the array:

int min = 2017, max = 3017;
int count = max - min + 1; //we're including upper bound
int[] anArray = new int[count];
for (int i = 0; i < count; i++, min++) {
    anArray[i] = min; //reused and incremented min
}

edited Jun 16 '17 at 09:28

answered Jun 16 '17 at 09:19

Rogue

11,105
5
45
71

3

Or `IntStream.rangeClosed(...)` – assylias Jun 16 '17 at 09:21
Well that's an idea – Rogue Jun 16 '17 at 09:21
1

This would work perfectly however I am using Java 7 so this will not work – Jun 16 '17 at 09:25
Updated for you. – Rogue Jun 16 '17 at 09:28
That's it! perfect – Jun 16 '17 at 09:40
required API level 24 in Android – Abu Nayem Nov 24 '20 at 01:37

score 0 · Answer 2 · answered Jun 16 '17 at 09:27

Well it is answered. But just to point out another way in java .. you can count the number of integers that will be coming and use iterator to fill the array.Let me know if you have any doubts in this In short I am saying to do like the following:

 int arr[] = new int[1001];
for(int i=2017;i<=3017;i++){
  arr[i-2017]=i;
}

Adding a range of numbers to a Java array

2 Answers2