Part ArrayList<String > to 3 strings sublist ArrayList<String >

Question

I have unknown size of my ArrayList also it is always different size but it is cubic. Is there any way to part it to 3 strings subLists?

Code:

int number = mainList.size()/3;
for(int i= 1 ; i < mainList.size()/3; i++){
    int index = i*3 ;           
    List<RootCreator> sublist =  mainList.subList(0, index);
    mainSublist.addAll(sublist);
}

I appreciate any help.

Answer 1

I am not sure about 3^n part but in general assuming you have inputStrList list, now break it into 3 parts.

ArrayList<String> subList1 = new ArrayList<String>(inputStrList.subList(0, start));
ArrayList<String> subList2= new ArrayList<String>(inputStrList.subList(start+1, middle));
ArrayList<String> subList3= new ArrayList<String>(inputStrList.subList(middle+1, end));