{"id":426502,"date":"2021-04-06T15:48:44","date_gmt":"2021-04-06T07:48:44","guid":{"rendered":"http:\/\/4563.org\/?p=426502"},"modified":"2021-04-19T01:11:40","modified_gmt":"2021-04-18T17:11:40","slug":"%e7%9c%8b%e5%ae%8c%e8%bf%99%e5%9d%97%e4%bb%a3%e7%a0%81%e6%88%91%e4%b9%85%e4%b9%85%e4%b8%8d%e8%83%bd%e5%b9%b3%e9%9d%99","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=426502","title":{"rendered":"\u770b\u5b8c\u8fd9\u5757\u4ee3\u7801,\u6211\u4e45\u4e45\u4e0d\u80fd\u5e73\u9759"},"content":{"rendered":"
\n
\n
\n

\u770b\u5b8c\u8fd9\u5757\u4ee3\u7801,\u6211\u4e45\u4e45\u4e0d\u80fd\u5e73\u9759 <\/h1>\n

<\/p>\n

\n
\u8cc7\u6df1\u5927\u4f6c : ignore <\/span> <\/i> 5<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
<\/p>\n

try { …. if(url == null) { throw new NullPointerException(); } …. } catch (IOException e) { e.fillInStackTrace(); }<\/p>\n<\/p><\/div>\n

\u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (63<\/span>) <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n
    \n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : TmacV2 <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u4e3a\u5565 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : iRiven <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @TmacV2 url \u4e3a\u7a7a\u7684\u65f6\u5019\u76f4\u63a5\u8c03\u7528\u5c31\u4f1a\u629b\u51fa NullPointerException <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : ignore <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u771f\u6ca1\u60f3\u5230\u80fd\u9047\u4e0a\u8fd9\u6837\u7684\u4ee3\u7801,\u4ee5\u524d\u770b\u7740\u522b\u4eba\u7684\u622a\u56fe\u4e5f\u5c31\u4e50\u4e50 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : xuanbg <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u8fd9\u4e2a catch \u662f\u4e3a\u53ef\u80fd\u662f\u4e0d\u5408\u6cd5\u7684\u6216\u8005\u65e0\u6cd5\u8bbf\u95ee\u7684 url \u51c6\u5907\u7684 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : misaka19000 <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u53ef\u80fd\u662f\u4e3a\u4e86\u65b9\u4fbf\u5728 catch \u4e2d\u5904\u7406\u7a7a\u6307\u9488\u5f02\u5e38 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : w4w <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u9047\u5230 NullPointerException\uff0c\u4e25\u7981\u4f7f\u7528 catch \u6765\u9690\u85cf\u7f16\u7801\u9519\u8bef <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : LGA1150 <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @w4w #6
    catch \u7684\u662f IOException <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : pkupyx <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @xuanbg \u8fd9\u4e2a catch \u5e94\u8be5\u662f\u7ba1\u7f51\u7edc IO \u4e0d\u53ef\u7528\u7684\u5f02\u5e38 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : phpfpm <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u770b\u5b8c\u8fd9\u4e2a\u5e16\u5b50\uff0c\u6211\u4e45\u4e45\u4e0d\u80fd\u5e73\u9759 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : LGA1150 <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @ignore \u80fd\u628a\u5b8c\u6574\u4ee3\u7801\u8d34\u51fa\u6765\u4e48\uff1f\u663e\u5f0f\u629b NPE \u5f88\u53ef\u80fd\u662f\u4e3a\u4e86\u5feb\u901f\u5931\u8d25\uff08 fail-fast \uff09
    https:\/\/stackoverflow.com\/questions\/45632920\/why-should-one-use-objects-requirenonnull\/45632988 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : ychost <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u53ef\u80fd\u5b8c\u5168\u662f\u4e3a\u4e86\u7ec8\u6b62\u5f53\u524d\u8bed\u53e5\u5757\uff0c\u4f46\u662f\u53c8\u4e0d\u60f3\u7ec8\u6b62\u65b9\u6cd5\uff0c\u53ef\u4ee5\u7528\u4e0b\u9762\u7684\u9a9a\u64cd\u4f5c\u5b9e\u73b0\uff1a
    do {
    if (url == null) {
    break;
    }<\/p>\n

    } while (false) <\/p><\/div>\n<\/p><\/div>\n<\/li>\n

  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : unicloud <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u8ddd\u79bb\u53d1\u5e16\u8fc7\u53bb 1 \u5c0f\u65f6 20 \u5206\u949f\u4e86\uff0c\u73b0\u5728\u5fc3\u60c5\u5e73\u9759\u4e86\u5417\uff1f <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : meteor957 <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u73b0\u5728\u5e73\u9759\u4e86\u5417 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : altchen <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u73b0\u5728\u5e73\u9759\u4e86\u5417
    \u4e3b\u4f60\u8fd9\u4e48\u5bb9\u6613\u6fc0\u52a8\uff0c\u5bf9\u4e0d\u8d77\u4f60\u8fd9\u4e2a ID \u554a\u3002:doge <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : tabris17 <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u80cc\u540e\u7684\u539f\u56e0\u8ba9\u4eba\u6696\u5fc3 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : xuanbg <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @pkupyx \u5bf9\u7684\uff0curl \u4e0d\u4e3a\u7a7a\u4e0d\u4ee3\u8868 url \u5c31\u6b63\u786e\u8fd4\u56de\u7ed3\u679c\uff0c\u8bf7\u6c42\u51fa\u73b0\u5f02\u5e38\u662f\u6700\u6b63\u5e38\u4e0d\u8fc7\u7684\u4e8b\u60c5\u3002\u8fd9\u65f6\u5019\u629b\u51fa\u5f02\u5e38\u663e\u7136\u4e0d\u5408\u9002\uff0c\u6240\u4ee5\u8981\u7528 try\/catch \u5403\u4e0b\u6765 IOException\uff0c\u5e76\u901a\u8fc7\u65e5\u5fd7\u8f93\u51fa\u5f02\u5e38\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : yeqizhang <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @LGA1150 #7 \u8d5e\u540c\u8fd9\u4f4d\u8001\u54e5\uff0c\u8fd9\u4e2a\u4ed6\u624b\u52a8\u629b\u7a7a\u6307\u9488\u4e86\uff0c\u540e\u9762\u4ee3\u7801\u4e0d\u4e00\u5b9a\u4f1a\u629b… \u6240\u4ee5\u770b\u60c5\u51b5\u3002\u8fd9\u4ee3\u7801\u786e\u5b9e\u4e0d\u592a\u597d\u300211 \u90a3\u4e2a\u770b\u8d77\u6765\u66f4\u8212\u670d\u70b9 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : ipwx <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u6211\u89c9\u5f97\u8fd9\u4e2a\u4ee3\u7801\u5f88\u597d\u554a\uff08\u524d\u63d0\u662f\u51fa null \u771f\u662f\u5f02\u5e38\u800c\u4e0d\u662f\u9884\u671f\u4e2d\u7684\u9519\u8bef\uff09\u3002\u8c01\u77e5\u9053\u6211\u4e00\u4e2a null \u653e\u540e\u9762\u7684\u5e93\u90fd\u4f1a\u5e72\u4e9b\u5565\uff0c\u5230\u65f6\u5019\u771f\u6709 null \u4e86\u90fd\u4e0d\u77e5\u9053\u600e\u4e48\u8c03\u8bd5\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : wolfie <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u552f\u4e00\u69fd\u70b9\uff0c\u6254\u5230\u4e86 try \u91cc\u9762\u3002\u6ca1\u5565\u5927\u95ee\u9898\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : guyeu <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u611f\u89c9\u6ca1\u5565\u6bdb\u75c5\u554a\u3002\u3002\u5165\u53c3\u4e0d\u5408\u6cd5\u8fd8\u4e0d\u8ba9\u629b\u5f02\u5e38\u4e86\u5417 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : AoEiuV020 <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u6ca1\u6bdb\u75c5\uff0c\u5f88\u53ef\u80fd\u662f\u7b49\u540e\u9762\u81ea\u52a8\u629b npe \u5c31\u665a\u4e86\uff0c\u629b\u5f02\u5e38\u524d\u5df2\u7ecf\u6267\u884c\u7684\u8bed\u53e5\u53c8\u4e0d\u80fd\u56de\u6eda\u7684\uff0c <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : kincaider <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u8fd8\u4e0d\u5e73\u9759\u5417\uff1f <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : mengkun <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \"\u770b\u5b8c\u8fd9\u5757\u4ee3\u7801,\u6211\u4e45\u4e45\u4e0d\u80fd\u5e73\u9759\" <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : Kasumi20 <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u4fdd\u62a4\u4ee3\u7801\u5728\u6b63\u5e38\u6761\u4ef6\u4e0b\u6267\u884c\u800c\u5df2\uff0c\u96be\u9053\u4f60\u4ece\u6765\u4e0d\u68c0\u67e5\u53c2\u6570\u7684\u5417 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : iseki <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u6211\u89c9\u5f97\u5f88\u591a\u65f6\u5019\u8fd9\u662f\u6b63\u786e\u7684\u7f16\u7801\u65b9\u5f0f\uff0cJava \u91cc\u6bd5\u7adf\u6ca1\u6709 checkNotNull <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : Leviathann <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u8fd9\u4e2a\u5c31\u662f guava \u7684 precondition.checknotnull \u5427 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : bigbyto <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u4e0d\u662f\u5341\u5206\u7684\u4f18\u96c5\uff0c\u4e0d\u8fc7\u6ca1\u89c9\u5f97\u6709\u592a\u5927\u7684\u95ee\u9898\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : shm7 <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u4e0d\u6653\u5f97 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : TheWidowMaker <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @guyeu \u629b npe \u5c31\u5f88\u5947\u602a\u4e86\u5427\uff1f <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : raaaaaar <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @mengkun #23 emmmm <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : Jaeden <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    throw NullPointerException\uff0ccatch IOException <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : LGA1150 <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @iseki #25
    Objects.requireNonNull <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : iseki <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @LGA1150 thx <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : Blessing1 <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u5e73\u5e38\u5fc3\u5bf9\u5f85\uff01\uff01\uff01 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : Still4 <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u4ee3\u7801\u4e0d\u5168\uff0c\u4f30\u6478\u7740 url \u6765\u81ea\u4e8e\u5176\u4ed6\u5730\u65b9\uff0c\u629b\u51fa\u9519\u8bef\u662f\u5408\u7406\u7684\uff0c\u629b\u51fa NPE \u4e0d\u5408\u7406 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : gamexg <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u975e java \u5f00\u53d1
    \u5982\u679c\u51fd\u6570\u53c2\u6570\u4e0d\u5141\u8bb8 null\uff0c\u90a3\u4e48\u6211\u4f1a\u5728\u51fd\u6570\u5f00\u5934\u76f4\u63a5\u68c0\u67e5
    \u5982\u679c\u4e3a\u53c2\u6570 null\uff0c\u7acb\u523b\u62a5\u9519\u5e76\u7ed3\u675f\u51fd\u6570\uff0c\u9632\u6b62\u7a0b\u5e8f\u6267\u884c\u4e00\u534a\u540e\u78b0\u5230\u7a7a\u6307\u9488\u9519\u8bef\u8fd8\u8981\u56de\u6eda\u64cd\u4f5c\u3002
    \u53e6\u5916\u4ee3\u7801\u4e5f\u80fd\u591f\u6e05\u6670\u7684\u8868\u660e\uff0c\u51fd\u6570\u4e0d\u5141\u8bb8 null \u53c2\u6570\u3002<\/p>\n

    \u4e0d\u8fc7\u4e00\u822c\u662f\u8fd4\u56de\u81ea\u5b9a\u4e49\u9519\u8bef\uff0c\u800c\u4e0d\u662f\u8fd4\u56de \u7a7a\u6307\u9488\u5f02\u5e38 <\/p><\/div>\n<\/p><\/div>\n<\/li>\n

  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : hhjswf <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u4ffa\u5bfb\u601d\u7740\uff0cNPE \u8fd8\u7528\u4f60\u629b\u554a <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : cgb1021 <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u662f\u4e3a\u4e86\u628a\u6240\u6709\u9519\u8bef\u90fd\u653e\u5728 catch \u91cc\u5904\u7406 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : wutiantong <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u641e\u4e0d\u61c2\u4f60\u4eec\u5199 java \u7684\u70b9\u5462[\u72d7\u5934] <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : sutra <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u6253\u5f00 V2EX \u6211\u4e45\u4e45\u4e0d\u80fd\u5e73\u9759\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : angryfish <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u770b\u5b8c\u4ee3\u7801\uff0c\u6211\u4e5f\u4e45\u4e45\u4e0d\u80fd\u5e73\u9759\uff0c\u5199\u4ee3\u7801\u600e\u4e48\u4e86 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : szq8014 <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u54c8\u54c8\uff0c\u4e3b\uff0c\u73b0\u5728\u8f6e\u5230\u6211\u4eec\u4e45\u4e45\u4e0d\u80fd\u5e73\u9759\u4e86 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : CantSee <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u5b9e\u4e60\u751f\u5199\u7684\u5427 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : shutan <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    V \u53cb\u4ea4\u6d41\u4e4b\u540e\u5e94\u8be5\u5c31\u5e73\u9759\u4e0b\u6765\u4e86 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : shuqin2333 <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u6ca1\u5565\u6bdb\u75c5\u554a <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : beichenhpy <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u6ca1\u6709\u524d\u9762\u7684\u4ee3\u7801\uff0c\u4e0d\u77e5\u9053 try \u662f\u4e3a\u4e86\u5e72\u4ec0\u4e48 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : unco020511 <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u975e\u8981\u89e3\u91ca\u7684\u8bdd\u4e5f\u80fd\u89e3\u91ca\u7684\u901a,\u5c31\u662f\u80fd\u5feb\u901f\u628a npe \u629b\u51fa\u6765,\u4e0d\u7136\u8fd8\u8981\u5230\u771f\u6b63\u4f7f\u7528 url \u7684\u65f6\u5019\u624d\u80fd\u629b\u51fa npe,\u7136\u540e catch ioExcption \u8fd9\u4e2a\u4e5f\u6ca1\u95ee\u9898,\u56e0\u4e3a url != null,\u4e0d\u4ee3\u8868\u5c31\u4e0d\u4f1a\u51fa\u73b0 io \u95ee\u9898 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : passerbytiny <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @TmacV2
    @xuanbg
    @yeqizhang
    @ipwx
    @wolfie
    @guyeu <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : passerbytiny <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u624b\u673a\u64cd\u4f5c\u5bb9\u6613\u8bef\u64cd\u4f5c\uff0c\u86cb\u75bc\u7684\u5f88\uff0c\u7b49\u6211\u518d\u7ec4\u7ec7\u56de\u590d <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : passerbytiny <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u7b2c\u4e00\uff0c\u4e0d\u542b\u4efb\u4f55\u4fe1\u606f\u7684 NullPointerException\uff0c\u5c31\u7b97\u662f\u65b9\u6cd5\u5f00\u5934\u7684\u53c2\u6570\u68c0\u9a8c\uff0c\u770b\u8d77\u6765\u4e5f\u662f\u602a\u602a\u7684\uff0c\u4f60\u54ea\u6015\u5f04\u4e2a NullPointException(“\u53c2\u6570\uff1a\u53c2\u6570\u540d”) \u4e5f\u6bd4\u8fd9\u5f3a\uff1b\u6216\u8005\u8bf4\uff0c\u88f8\u53c2\u6570\u6784\u9020\u7684 NullPointerException \u5305\u542b\u7684\u4fe1\u606f\u91cf\u592a\u5c11\uff0c\u8981\u662f\u672a\u9884\u671f\u7684\u7531 JVM \u629b\u51fa\u8fd8\u884c\uff0c\u8981\u662f\u4e3b\u52a8\u53bb\u629b\u51fa\u5c31\u663e\u5f97\u5f88\u4e0d\u8d1f\u8d23\u4efb\u3002<\/p>\n

    \u7b2c\u4e8c\uff0c\uff1c try { …. } catch (IOException e) { e.fillInStackTrace(); \uff1e\uff0c\u8fd9\u662f\u660e\u663e\u7684\u5403\u6389\u5f02\u5e38\u7684\u884c\u4e3a\uff0c\u975e\u5e38\u65b0\u624b\u6216\u8005\u4e0d\u8d1f\u8d23\u4efb\u7684\u884c\u4e3a\u3002 <\/p><\/div>\n<\/p><\/div>\n<\/li>\n

  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : sdlzqjf <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u6211\u4e0d\u660e\u767d\u4e3b\u4e3a\u5565\u4e0d\u80fd\u5e73\u9759\uff0c\u4e0d\u77e5\u9053\u69fd\u70b9\u5728\u54ea\uff1f\u4ece\u5199\u6cd5\u4e0a\u6765\u8bf4\u8fd9\u6bb5\u4ee3\u7801\u503c\u5f97\u5546\u69b7\uff0c\u4f46\u662f\u4ece\u6267\u884c\u4e0a\u6765\u8bf4\u662f\u6ca1\u95ee\u9898\u7684
    NullPointerException \u662f\u8fd0\u884c\u65f6\u5f02\u5e38\uff0cIOException \u975e\u8fd0\u884c\u65f6\u5f02\u5e38\uff0ccatch IOException \u5e76\u4e0d\u4f1a\u6355\u6349\u5230 NullPointerException\uff0c\u4ecd\u7136\u4f1a\u629b\u7ed9\u4e0a\u5c42\uff0c\u6267\u884c\u8d77\u6765\u903b\u8f91\u662f\u6ca1\u95ee\u9898\u7684\u3002
    \u5f53\u7136\uff0c\u4e3b\u8fd9\u6bb5\u4ee3\u7801\u6ca1\u6709\u4e1a\u52a1\u903b\u8f91\uff0c\u6240\u4ee5\u65e0\u6cd5\u5224\u65ad throw NullPointerException \u662f\u4e0d\u662f\u5408\u7406 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : guyeu <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @TheWidowMaker #29 java \u81ea\u5e26\u7684 Objects.requireNonNull\uff0cGuava \u7684 Preconditions.chechNotNull \u90fd\u662f\u629b\u51fa\u7a7a\u6307\u9488\u5f02\u5e38\uff0c\u8fd9\u4fe9 API \u7684\u8bbe\u8ba1\u8005\u90fd\u89c9\u5f97\u6307\u9488\u662f\u7a7a\u7684\u629b\u4e2a\u7a7a\u6307\u9488\u5c31\u53ef\u4ee5\uff0c\u6709\u4ec0\u4e48\u95ee\u9898\u5462\uff1f <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : lachesis <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u8131\u79bb\u4e1a\u52a1\u4e0a\u4e0b\u6587\u5355\u72ec\u770b\uff0c\u69fd\u70b9\u6709\uff0c\u4f46\u8fd8\u6ca1\u5230\u5938\u5f20\u7684\u5730\u6b65\uff0c\u80fd\u7528 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : gowk <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @mengkun \u4f60\u8fd9\u4e2a\u56fe\u53ef\u7b11\u6b7b\u6211\u4e86 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : Anarchy <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u69fd\u70b9\u5728\u54ea\uff1f\u7a7a\u6307\u9488\u95ee\u9898\u63d0\u524d\u629b\u51fa\u6765\u6ca1\u5565\u95ee\u9898\u554a\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : hodur <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u4e0d\u90a3\u4e48\u597d\uff0c\u4f46\u53c8\u6bd4\u7528\u5230 url \u65f6\u81ea\u52a8\u629b\u51fa\u597d\u4e00\u70b9 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : SWYou <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u770b\u4e86\u8fd9\u4e2a\u5e16\u5b50\u4ee5\u540e\uff0c\u6211\u4eca\u5929\u4e5f\u8bd5\u4e86\u8bd5\u4e3b\u52a8\u629b\u51fa NPE\uff0c\u611f\u89c9\u53ef\u6709\u903c\u683c\u4e86\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : crclz <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u5fc5\u987b\u5728\u51fd\u6570\u5f00\u5934\u68c0\u67e5\u5f15\u7528\u662f\u5426\u4e3a null\uff0c\u8fd9\u662f\u6700\u57fa\u7840\u7684\u7f16\u7a0b\u5e38\u8bc6\u3002\u8fd9\u6837\u5c31\u53ef\u4ee5\u533a\u5206\u662f\u8c03\u7528\u8005\u51fa\u4e86\u95ee\u9898\uff0c\u4f20\u5165\u4e86 null\uff0c\u8fd8\u662f\u51fd\u6570\u4f53\u6709 bug\uff0c\u5728\u4e2d\u9014\u8bbf\u95ee\u4e86 null \u3002bug \u5c31\u88ab\u5c40\u9650\u5728\u5c0f\u8303\u56f4\u5185\uff0c\u800c\u4e0d\u662f\u8de8\u51fd\u6570\u627e bug \u3002<\/p>\n

    \u9664\u6b64\u4e4b\u5916\uff0c\u6ca1\u6709\u4ee3\u7801\u4e0a\u4e0b\u6587\uff0c\u552f\u4e00\u53ef\u80fd\u51fa\u95ee\u9898\u7684\u5c31\u662f\u628a IOException \u63a9\u76d6\u6389\u7684\u95ee\u9898\u3002<\/p>\n

    @guyeu C# visual studio \u5bf9\u4f20\u5165\u53c2\u6570\u7684\u4ee3\u7801\u5efa\u8bae\u4e5f\u5305\u542b if(x == null) throw new NullReferenceException(nameof(x))\uff0c\u548c java \u7684\u601d\u60f3\u4e00\u81f4\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n

  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : nowto <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u9519\u8bef\u8981\u65e9\u53d1\u73b0\u65e9\u66b4\u9732\uff0c\u80fd\u5728\u7f16\u8bd1\u5668\u66b4\u9732\u7684\uff0c\u5c31\u4e0d\u8981\u7b49\u5230\u8fd0\u884c\u671f\u3002\u5c31\u7b97\u8fd0\u884c\u671f\u4e5f\u8981\u80fd\u65e9\u66b4\u9732\u5c3d\u65e9\u66b4\u9732\u3002\u6240\u4ee5\u4e00\u822c\u4f1a\u5728 public \u51fd\u6570\u5f00\u59cb\u5904\u505a\u53c2\u6570\u6821\u9a8c\uff0c\u629b\u51fa\u4e1a\u52a1\u76f8\u5173\u5f02\u5e38\uff1b\u800c\u4e14\u5e94\u8be5\u5c3d\u91cf\u5728 javadoc \u6ce8\u660e\u67d0\u53c2\u6570\u4e0d\u63a5\u53d7 null\uff0c\u4f1a\u629b\u4ec0\u4e48\u6837\u7684\u5f02\u5e38\u3002<\/p>\n

    \u5982\u679c\u4e0d\u505a\u663e\u5f0f\u6821\u9a8c\uff0c\u800c\u662f\u4f7f\u7528\u5230\u8fd9\u4e2a\u53c2\u6570\u65f6\u4f9d\u9760 jvm \u81ea\u52a8\u62a5\u9519\uff1a
    1 \u3001\u4f1a\u665a\uff1b 2 \u3001\u662f\u4e00\u4e2a\u4e1a\u52a1\u65e0\u5173\u7684\u5f02\u5e38\uff1b 3 \u3001\u968f\u7740\u91cd\u6784\u7684\u8fdb\u884c\uff0c\u5165\u53c2\u548c\u53c2\u6570\u4f7f\u7528\u7684\u4f4d\u7f6e\u53ef\u80fd\u4f1a\u5f88\u8fdc\uff0c\u751a\u81f3\u4e0d\u5728\u540c\u4e00\u4e2a\u65b9\u6cd5 <\/div>\n<\/p><\/div>\n<\/li>\n

  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : justforlook44444 <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u59d1\u4e14\u4e0d\u8c08 try catch\uff0c
    github \u4e0a\u641c\u7d22 throw new NullPointerException\uff0c\u4ee3\u7801\u6709 500 \u4e07\u884c\uff0c\u5176\u4e2d\u5f88\u591a\u90fd\u662f\u8fd9\u79cd\u5199\u6cd5;
    jdk \u91cc\u9762\u4e5f\u6709\u8fd9\u79cd\u5199\u6cd5
    jdk\/src\/java.xml.crypto\/share\/classes\/javax\/xml\/crypto\/dsig\/dom\/DOMSignContext.java
    public DOMSignContext(Key signingKey, Node parent) {
    if (signingKey == null) {
    throw new NullPointerException(“signingKey cannot be null”);
    }
    if (parent == null) {
    throw new NullPointerException(“parent cannot be null”);
    }
    setKeySelector(KeySelector.singletonKeySelector(signingKey));
    this.parent = parent;
    }
    \u6240\u4ee5\u4f60\u4e0d\u80fd\u5e73\u9759\u7684\u70b9\u5728\u54ea\u91cc\uff1f <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : DavidDee <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    fail early? <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : chinvo <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u68c0\u67e5\u53c2\u6570\u4e0d\u5e94\u8be5\u662f\u5728\u65b9\u6cd5\u5f00\u5934<\/p>\n

    if (url == null) throw new ArgumentNullException(nameof(url));<\/p>\n

    \u4e48 <\/p><\/div>\n<\/p><\/div>\n<\/li>\n

  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : privatetan <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u5f88\u591a\u6e90\u7801\u4e0d\u90fd\u6709\u8fd9\u6837\u7684\u5224\u65ad\u4e48 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n","protected":false},"excerpt":{"rendered":"

    \u770b\u5b8c\u8fd9\u5757\u4ee3\u7801,\u6211\u4e45\u4e45\u4e0d\u80fd\u5e73\u9759 \u8cc7\u6df1…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"_links":{"self":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/426502"}],"collection":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=426502"}],"version-history":[{"count":1,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/426502\/revisions"}],"predecessor-version":[{"id":426507,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/426502\/revisions\/426507"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=426502"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=426502"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=426502"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}