{"id":31290,"date":"2023-08-18T18:36:01","date_gmt":"2024-01-31T07:08:48","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90java%e3%80%91static%e6%98%af%e4%bb%80%e4%b9%88%e6%84%8f%e6%80%9d\/"},"modified":"2025-08-12T23:16:30","modified_gmt":"2025-08-12T15:16:30","slug":"%e3%80%90java%e3%80%91static%e6%98%af%e4%bb%80%e4%b9%88%e6%84%8f%e6%80%9d","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90java%e3%80%91static%e6%98%af%e4%bb%80%e4%b9%88%e6%84%8f%e6%80%9d\/","title":{"rendered":"\u3010Java\u3011static\u662f\u4ec0\u4e48\u610f\u601d"},"content":{"rendered":"

\u6211\u662f\u7b2c\u4e00\u6b21\u6295\u7a3f\u3002<\/p>\n

\u5728\u8bfb\u5b8c\u725b\u5c3e\u521a\u5148\u751f\u7684\u300a\u4e16\u754c\u4e00\u6d41\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u601d\u8003\u6cd5\u300b\u540e\uff0c\u6211\u53d7\u5230\u4e86\u6781\u5927\u7684\u542f\u53d1\uff0c\u7acb\u523b\u51b3\u5b9a\u5f7b\u5e95\u5730\u91cd\u65b0\u5b66\u4e60\u6211\u76ee\u524d\u5728\u9879\u76ee\u4e2d\u4f7f\u7528\u7684Java\u548cSpring Boot\u7684\u57fa\u7840\u77e5\u8bc6\u3002
\n\u867d\u7136\u6211\u4f5c\u4e3a\u4e00\u540d\u5de5\u7a0b\u5e08\u5df2\u7ecf\u67096\u5e74\u7684\u7ecf\u9a8c\uff0c\u4f46\u6211\u4e4b\u524d\u5bf9Java\u7684\u7406\u89e3\u53ea\u662f\u8868\u9762\u4e0a\u7684\uff0c\u4e00\u76f4\u4f9d\u8d56\u641c\u7d22\u5f15\u64ce\u6216\u8005\u53c2\u8003\u5176\u4ed6\u7a0b\u5e8f\u5458\u7684\u6837\u4f8b\u6765\u5e94\u5bf9\u5de5\u4f5c\uff0c\u771f\u53ef\u8c13\u662f\u4e09\u6d41\u7684\u5de5\u7a0b\u5e08\u3002<\/p>\n

\u9996\u5148\uff0c\u6211\u5f00\u59cb\u9605\u8bfb\u7ecf\u5178\u4e66\u7c4d\u4e4b\u4e00\u7684\u300aEffective Java \u7b2c3\u7248\u300b\uff0c\u8fd9\u672c\u4e66\u8bb2\u8ff0\u4e86Java\u7684\u57fa\u7840\u77e5\u8bc6\u3002
\n\u5f00\u59cb\u9605\u8bfb\u540e\u4e0d\u4e45\uff0c\u6211\u9047\u5230\u4e86\u4e00\u4e2a\u7591\u95ee\uff0c\u5373\u4ec0\u4e48\u662f\u9759\u6001\u5de5\u5382\u65b9\u6cd5\uff1f
\n\u5b9e\u9645\u4e0a\uff0c\u6211\u5bf9\u9759\u6001\u65b9\u6cd5\u8fd9\u4e2a\u6982\u5ff5\u7406\u89e3\u5f97\u5982\u4f55\uff1f\u662f\u5426\u7406\u89e3\u5f97\u4e0d\u591f\u6e05\u695a\uff1f<\/p>\n

\u90a3\u4e48\u9996\u5148\u6211\u4eec\u8981\u597d\u597d\u7406\u89e3\u4e00\u4e0bstatic\u7684\u6982\u5ff5\u3002<\/p>\n

\u9759\u6001\u6210\u5458\u662f\u6307\u603b\u7ed3\u6765\u8bf4\uff0c\u5b83\u662f\u201c\u4e0e\u7c7b\u76f8\u5173\u8054\u800c\u4e0d\u662f\u4e0e\u5b9e\u4f8b\u76f8\u5173\u8054\u7684\u6210\u5458\u201d\u3002<\/p>\n

\u6211\u6b63\u597d\u5728\u696d\u52d9\u4e0a\u9047\u5230\u4e00\u500b\u5f88\u597d\u7684\u4f8b\u5b50\uff0c\u5229\u7528\u5b83\u4f86\u6574\u7406\u4e00\u4e0b\u3002<\/p>\n

\u6211\u5e0c\u671b\u901a\u8fc7\u4eca\u5929\u7684\u4efb\u52a1\u89e3\u51b3\u4ee5\u4e0b\u95ee\u9898\uff1a
\n“\u6211\u60f3\u5bf9\u4eceCSV\u5bfc\u5165\u7684\u503c\u8fdb\u884c\u9a8c\u8bc1\uff0c\u4ee5\u4f7f\u5176\u4e0e\u6700\u7ec8\u6570\u636e\u534f\u8c03\u7684\u76ee\u6807\u6570\u636e\u5e93\u7684\u4f4d\u6570\u76f8\u5339\u914d”
\n\uff08\u5b9e\u9645\u4e0a\uff0c\u6211\u89c9\u5f97\u8fd9\u4e2a\u95ee\u9898\u4e4b\u524d\u5e94\u8be5\u5df2\u7ecf\u5904\u7406\u8fc7\u4e86\uff09<\/p>\n

\u9996\u5148\uff0c\u6211\u8bd5\u7740\u5199\u4e86\u4e00\u4e2a\u8fd9\u6837\u7684\u5904\u7406\u8fc7\u7a0b\u3002<\/p>\n

String<\/span> strNum<\/span> =<\/span> \"1234.5678\"<\/span> \/\/ \u307b\u3093\u3068\u306fcsv\u304b\u3089\u8aad\u307f\u53d6\u3063\u305f\u5024<\/span>\r\n\r\ntry<\/span> {<\/span>\r\n\tBigDecimal<\/span> bigDecimalNum<\/span> =<\/span> new<\/span> BigDecimal<\/span>(<\/span>strNum<\/span>);<\/span>\r\n\tif<\/span> (<\/span>bigDecimalNum<\/span>.<\/span>precision<\/span>()<\/span> -<\/span> bigDecimalNum<\/span>.<\/span>scale<\/span>()<\/span> ><\/span> 30<\/span> ||<\/span> bigDecimalNum<\/span>.<\/span>scale<\/span>()<\/span> ><\/span> 5<\/span>)<\/span> {<\/span>\r\n\t\t\/\/ \u6841\u6570\u30c1\u30a7\u30c3\u30af\u30a8\u30e9\u30fc\u306e\u51e6\u7406<\/span>\r\n\t}<\/span>\r\n}<\/span> catch<\/span> e<\/span> {<\/span>\r\n\t\/\/ \u6570\u5024\u4ee5\u5916\u304c\u5165\u3063\u3066\u304d\u305f\u5834\u5408\u306e\u4f8b\u5916\u51e6\u7406<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u7136\u800c\uff0c\u56e0\u4e3a\u6570\u5b57\u7684\u8fde\u5728\u4e00\u8d77\u7684\u5199\u6cd5\u6709\u70b9\u8ba9\u4eba\u5728\u610f\uff0c\u6240\u4ee5\u6211\u5411\u67b6\u6784\u5e08\u54a8\u8be2\u4e86\u4e00\u4e0b\u3002
\n\uff08\u987a\u4fbf\u8bf4\u4e00\u53e5\uff0c\u8fd9\u4f4d\u67b6\u6784\u5e08\u662f\u4e00\u4e2a\u975e\u5e38\u4f18\u79c0\u7684\u5de5\u7a0b\u5e08\u3002\u4ed6\u4f7f\u7528\u7684\u7f16\u8f91\u5668\u662f\u79c0\u4e38\uff57\uff09<\/p>\n
\u6211\u8bd5\u7740\u8fdb\u884c\u4e86\u6539\u8fdb\uff0c\u5177\u4f53\u5982\u4e0b\u3002 (W\u01d2 , .)<\/p>\n
\u6700\u521d\u4e3a\u4e86\u6570\u636e\u534f\u8c03\u800c\u5b9e\u65bd\u7684\u6570\u503c\u9879\u7c7b\uff0c\u57fa\u672c\u4e0a\u6309\u7167\u4ee5\u4e0b\u7684\u65b9\u5f0f\u5b9e\u73b0\u3002<\/p>\n
public<\/span> class<\/span> numValue<\/span> {<\/span>\r\n\tprivate<\/span> BigDecimal<\/span> value<\/span>;<\/span>\r\n\r\n\t\/\/ \u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf<\/span>\r\n\tpublic<\/span> numValue<\/span>(<\/span>BigDecimal<\/span> value<\/span>)<\/span> {<\/span>\r\n\t\tthis<\/span>.<\/span>value<\/span> =<\/span> value<\/span>;<\/span>\r\n\t}<\/span>\r\n\r\n\tpublic<\/span> BigDecimal<\/span> getValue<\/span>()<\/span> {<\/span>\r\n\t\treturn<\/span> value<\/span>;<\/span>\r\n\t}<\/span>\r\n\r\n}<\/span>\r\n<\/code><\/pre>\n
\u5728\u90a3\u91cc\uff0c\u8fd9\u6837\u6dfb\u52a0\u3002<\/p>\n
public<\/span> class<\/span> numValue<\/span> {<\/span>\r\n\tprivate<\/span> BigDecimal<\/span> value<\/span>;<\/span>\r\n\r\n\tstatic<\/span> final<\/span> int<\/span> INTEGER_LENGTH_LIMIT<\/span> =<\/span> 30<\/span>;<\/span>  \/\/ static\u306a\u30e1\u30f3\u30d0<\/span>\r\n\tstatic<\/span> final<\/span> int<\/span> DECIMAL_LENGTH_LIMIT<\/span> =<\/span> 5<\/span>;<\/span>  \/\/ static\u306a\u30e1\u30f3\u30d0<\/span>\r\n\r\n\t\/\/ \u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf<\/span>\r\n\tpublic<\/span> numValue<\/span>(<\/span>BigDecimal<\/span> value<\/span>)<\/span> {<\/span>\r\n\t\tthis<\/span>.<\/span>value<\/span> =<\/span> value<\/span>;<\/span>\r\n\t}<\/span>\r\n\r\n\tpublic<\/span> BigDecimal<\/span> getValue<\/span>()<\/span> {<\/span>\r\n\t\treturn<\/span> value<\/span>;<\/span>\r\n\t}<\/span>\r\n\r\n\tpublic<\/span> static<\/span> boolean<\/span> isValidLength<\/span>(<\/span>BigDecimal<\/span> value<\/span>)<\/span> {<\/span>\r\n\t\tif<\/span> (<\/span>value<\/span>.<\/span>precision<\/span>()<\/span> -<\/span> value<\/span>.<\/span>scale<\/span>()<\/span> ><\/span> INTEGER_LENGTH_LIMIT<\/span>\r\n\t\t\t||<\/span> value<\/span>.<\/span>scale<\/span>()<\/span> ><\/span> DECIMAL_LENGTH_LIMIT<\/span>\r\n\t\t)<\/span> {<\/span>\r\n\t\t\treturn<\/span> false<\/span>;<\/span>\r\n\t\t}<\/span>\r\n\t\treturn<\/span> true<\/span>;<\/span>\r\n\t}<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u662f\u7684\uff0c\u9759\u6001\u6210\u5458\u5df2\u7ecf\u51fa\u73b0\u3002<\/p>\n
\u9996\u5148\u662f\u975e\u9759\u6001\u6210\u5458 value\u3002
\n\u8fd9\u662f\u4e0e\u901a\u8fc7 new numValue(value) \u751f\u6210\u7684\u5b9e\u4f8b\u76f8\u5173\u8054\u7684\u6210\u5458\u3002<\/p>\n
numValue<\/span> num1<\/span> =<\/span> new<\/span> numValue<\/span>(<\/span>new<\/span> BigDecimal<\/span>(<\/span>123.45<\/span>));<\/span>\r\nnumValue<\/span> num2<\/span> =<\/span> new<\/span> numValue<\/span>(<\/span>new<\/span> BigDecimal<\/span>(<\/span>67.89<\/span>));<\/span>\r\n<\/code><\/pre>\n
\u6bcf\u4e2a\u5b9e\u4f8b\u90fd\u6709\u4e0d\u540c\u7684\u503c\uff0c\u4e0d\u662f\u5417\uff1f<\/p>\n
\u5728\u9759\u6001\u6210\u5458\u8fd9\u4e00\u65b9\u9762\uff0c\u65e0\u8bba\u662fnum1\u8fd8\u662fnum2\u90fd\u5177\u6709\u76f8\u540c\u7684\u503c\u3002
\n\u751a\u81f3\u53ef\u4ee5\u5728\u4e0d\u5b9e\u4f8b\u5316\u7684\u60c5\u51b5\u4e0b\u5f15\u7528\u8fd9\u4e9b\u503c\u3002<\/p>\n
System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>num1<\/span>.<\/span>INTEGER_LENGTH_LIMIT<\/span>);<\/span>  \/\/ 30<\/span>\r\nSystem<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>num2<\/span>.<\/span>INTEGER_LENGTH_LIMIT<\/span>);<\/span>  \/\/ 30<\/span>\r\nSystem<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>numValue<\/span>.<\/span>INTEGER_LENGTH_LIMIT<\/span>);<\/span>  \/\/ 30<\/span>\r\n<\/code><\/pre>\n
\u8fd9\u662f\u56e0\u4e3a\u8fd9\u4e2a\u6210\u5458\u4e0e\u73ed\u7ea7\u6709\u5173\u8054\u7684\u6210\u5458\u3002<\/p>\n
\u6700\u540e\u518d\u603b\u7ed3\u4e00\u6b21<\/p>\n
\u975e\u9759\u6001\u6210\u5458\uff1a\u4e0e\u5b9e\u4f8b\u76f8\u5173\u8054\u7684\u6210\u5458
\n\u9759\u6001\u6210\u5458\uff1a\u4e0e\u7c7b\u76f8\u5173\u8054\u7684\u6210\u5458
\n\u8fd9\u662f\u6211\u5bf9static\u7684\u7406\u89e3\u7684\u603b\u7ed3\u3002\uff08\u4f46\u5982\u679c\u6709\u4eba\u95ee\u5230static\u7c7b\uff0c\u6211\u8fd8\u4e0d\u80fd\u89e3\u91ca\uff0c\u6240\u4ee5\u6211\u4f1a\u518d\u5b66\u4e60\u5e76\u5199\u4e0b\u6765\u3002\uff09<\/p>\n
\u984d\u5916\u8a0e\u8ad6\uff1a\u975c\u614b\u5de5\u5ee0\u65b9\u6cd5\u5728\u8fd9\u91cc\u5b9e\u73b0\u7684 isValidLength \u65b9\u6cd5\u662f\u4e00\u4e2a\u7591\u95ee\u7684\u8d77\u70b9\uff0c\u5b83\u662f\u4e00\u4e2a\u9759\u6001\u5de5\u5382\u65b9\u6cd5\u3002\u6211\u4eec\u5145\u5206\u4eab\u53d7\u4e86\u9759\u6001\u5de5\u5382\u65b9\u6cd5\u7684\u4e00\u4e2a\u4f18\u70b9\uff0c\u5c31\u662f\u53ef\u4ee5\u8fd4\u56de\u4efb\u610f\u5b50\u7c7b\u578b\u7684\u5bf9\u8c61\u4f5c\u4e3a\u65b9\u6cd5\u7684\u8fd4\u56de\u7c7b\u578b\uff08\u9664\u6b64\u4e4b\u5916\uff0c\u8fd8\u6709\u5176\u4ed6\u7684\u4f18\u70b9\uff0c\u6211\u4f1a\u5728\u540e\u9762\u8be6\u7ec6\u8bf4\u660e\uff09\u3002<\/p>\n
\u6211\u5c06\u4f7f\u7528\u8fd9\u4e2a\u65b9\u6cd5\u6765\u4fee\u590d\u521d\u59cb\u7684\u4ee3\u7801\u3002<\/p>\n
String<\/span> strNum<\/span> =<\/span> \"1234.5678\"<\/span> \/\/ \u307b\u3093\u3068\u306fcsv\u304b\u3089\u8aad\u307f\u53d6\u3063\u305f\u5024<\/span>\r\n\r\ntry<\/span> {<\/span>\r\n\tBigDecimal<\/span> bigDecimalNum<\/span> =<\/span> new<\/span> BigDecimal<\/span>(<\/span>strNum<\/span>);<\/span>\r\n\tif<\/span> (!<\/span>bigDecimalNum<\/span>.<\/span>isValidLength<\/span>)<\/span> {<\/span>\r\n\t\t\/\/ \u6841\u6570\u30c1\u30a7\u30c3\u30af\u30a8\u30e9\u30fc\u306e\u51e6\u7406<\/span>\r\n\t}<\/span>\r\n}<\/span> catch<\/span> e<\/span> {<\/span>\r\n\t\/\/ \u6570\u5024\u4ee5\u5916\u304c\u5165\u3063\u3066\u304d\u305f\u5834\u5408\u306e\u4f8b\u5916\u51e6\u7406<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u4e0d\u518d\u9700\u8981\u5c06\u5e38\u6570\u786c\u7f16\u7801\u5230\u4e1a\u52a1\u903b\u8f91\u4e2d\uff0c\u8fd9\u8ba9\u4ee3\u7801\u770b\u8d77\u6765\u66f4\u52a0\u6e05\u6670\u7b80\u6d01\u3002\uff08\u6216\u8bb8static\u5173\u952e\u5b57\u5e76\u4e0d\u662f\u592a\u76f8\u5173\uff09<\/p>\n
\u5982\u679c\u6709\u9519\u8bef\u6216\u5176\u4ed6\u95ee\u9898\uff0c\u8bf7\u52a1\u5fc5\u63d0\u51fa\u6307\u6b63\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
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