??????Java?е?null
???????????? ???????[ 2014/8/26 10:22:11 ] ????????Java ????? ??????
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????String x = null;
????1. ????????????Щ???
???????????????????????????????????????????????? ?????????????????????????ú????????????????????????????????????洢????????????????????????????????????????
??????Java?б??????????????: ???(primitive)???????(reference).
??????????????????????洢?????????;????????????????????洢?????????????(???????).
???????????????У? ??????????????????? "x". x?д?????String????????? null.
??????????????????????????:
??????????? x = "abc"????????????????:
????2. ???????null?????????
??????Java?? null ??????????????null?????
????????????????null????????????object??????????????????????.
????null ??????????????????????????κζ???
??????????? JVM?淶 ??????:
????Java??????淶??????????????????????????null??
?????????????????C?????????null??????????????????0??
?????????: Java???????????????????????????????????????λ?????0?????? ??????0?? boolean??false?? ?????? 0.0f?? ?????? null?? ??????????????????????????? null ??????????0. ?????????????????? ??? 0 ?????????????κζ?????
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