Miscellany

import java.util.List;public class Fold {      public int foldl(Operator op, Integer init, List<Integer> list) {        if (list.isEmpty())       return init;      int akk = init;    int length = list.size();    for (int i = 0; i < length; i++) {           akk = op.operate(akk, list.get(i));          }        return akk;      }      public int foldr(Operator op, Integer init, List<Integer> list) {       if (list.isEmpty())      return init;        int akk = init;    int length = list.size();        for (int i = length; i >= 0; i--) {            akk = op.operate(list.get(i), akk);          }        return akk;      }    }