Java int??integer??????

????int??integer?????????????????????????????????????????
????int ?????????????????????integer????????????????????????
????1.Java ?е???????????????????????????????????
????int ??????integer ?????????????????????????г?????int??????????0.??Integer????????????null.
????2.????????
????int i =1??Integer i= new Integer(1);(???integer ?????????)??????????????????????
????????Integer?????????Integer i= 1??
????int ????????????????????????μ????????????java?????油????Integer ?????????int???????????????????????
???????????У?float Float;double Double;string String??????????????? int ??????????????????Щ?????????
???????????????????ArrayList??HashMap?з?????????int??double????????????????????????????????? object????????????Щ???????????????
????Java????????????????????????
????Java??int??Integer??????????????????￡?
????1.int????????????????
????2.Integer??int??????
????3.int??Integer?????????????????
????4.int??Integer??????????????????????????????????
???????????
????ArrayList al=new ArrayList();
????int n=40;
????Integer nI=new Integer(n);
????al.add(n);//??????
????al.add(nI);//????
?????????????????????int: ?磺List<Integer> list = new ArrayList<Integer>();????  ??List<int> list = new ArrayList<int>();????
?????????????????????????int?????????????????????Щ????????????or??????????д???????????????????int????????????????????????????????д??????????Integer????????????????java?????????????????????????????????????????????????????Щ???????????????java??????????????????????????????????????????????????????????????????????????????