List<Integer> integerList = new ArrayList<Integer>(); integerList.add(1); Integer[] integers = integerList.toArray(new Integer[integerList.size()]); int[] ints = ArrayUtils.toPrimitive(integers);
原始类型数组-》对象数组-》集合
int[] ints = {2}; Integer[] integers = ArrayUtils.toObject(ints); List<Integer> integerList = new ArrayList<Integer>(); Collections.addAll(integerList, integers);