Using streams to partition a set of strings into subsets of size x

Question

I have a stream of strings. I want to provide a method parameter x which then streams the strings in groups of x which can then be collected in a set.

So if x=4 then and the stream size was 8, then I would have two sets containing 4 elements. The for each of those sets of 4 elements I can call ForEach and do other operations on, in the above example forEach would be called twice 1 for each 4 element set.

Unclear what youre asking but you need to try something before asking a question. This is a Q&A site — Reimeus, Apr 24 '19 at 09:35
@Reimeus please see the title. I guess I am looking to use streams to partition a set of strings into subsets of size x — TheDon2019, Apr 24 '19 at 09:39
https://stackoverflow.com/questions/5824825/efficient-way-to-divide-a-list-into-lists-of-n-size — Thiyagu, Apr 24 '19 at 09:49

Ice.Rain · Answer 1 · 2019-04-24T20:22:25.960

I'm not very sure if it is what you are asking.

So you have some data (say, integer), and you want to put it into multiple collections, each set have X elements.

Maybe you can use a 2D array? I don't have a JDK on hand so i just writing some pseudo code. For example:

int[][] MyArray = new int[MAX_BUFFER][X]

Then you use a while loop

int a = 0, b = 0;
While(!instream.empty){
  int t = instream.next;
  MyArray[a][b]=t;
  b++;
  if(b>=X){
    a++;
    b=0;
  }
}

I suddenly understand that arraylist of arrays may work better for you.

ArrayList<int[]> MyArray = new ArrayList<int[]>()

    int a = 0;
    int temparray= new int[X];
    While(!instream.empty){
      int t = instream.next;
      temparray[a]=t;
      a++;
      if(a>=X){
        a=0;
        MyArray.add(temparray);
      }
    }
    if(a>0){//So there are some data left in the temp array;
      MyArray.add(temparray);
    }

Using streams to partition a set of strings into subsets of size x

1 Answers1