List<Integer> sourList = new ArrayList<>();
sourList = Arrays.asList(1, 2,3,4,5,6,7);
int batchCount = 3;
int sourListSize = sourList.size();
int subCount = sourListSize % batchCount == 0 ? sourListSize / batchCount : sourListSize / batchCount + 1;
int stopIndext = 0;
for (int i = 0; i < subCount; i++) {
stopIndext = (i == subCount - 1) ? sourList.size() : batchCount * i + batchCount;
List<Integer> tempList = sourList.subList(batchCount * i, stopIndext);
System.out.println(tempList);
}