{"id":312134,"date":"2024-05-20T22:31:29","date_gmt":"2024-05-20T14:31:29","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/312134.html"},"modified":"2024-05-20T22:31:51","modified_gmt":"2024-05-20T14:31:51","slug":"java-%e9%a1%b9%e7%9b%ae%e6%b5%ae%e7%82%b9%e6%95%b0%e7%b2%be%e5%ba%a6%e4%b8%a2%e5%a4%b1%ef%bc%8c%e5%8f%af%e4%bb%a5%e6%80%8e%e4%b9%88%e8%a7%a3%e5%86%b3-2","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/312134.html","title":{"rendered":"java \u9879\u76ee\u6d6e\u70b9\u6570\u7cbe\u5ea6\u4e22\u5931\uff0c\u53ef\u4ee5\u600e\u4e48\u89e3\u51b3"},"content":{"rendered":"

\"java<\/p>\n

Java \u9879\u76ee\u4e2d\u6d6e\u70b9\u6570\u7cbe\u5ea6\u4e22\u5931\u7684\u95ee\u9898\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528BigDecimal<\/code>\u7c7b\u3001\u907f\u514d\u76f4\u63a5\u6bd4\u8f83\u6d6e\u70b9\u6570\u3001\u4f7f\u7528\u5b57\u7b26\u4e32\u8fdb\u884c\u8fd0\u7b97\u3001\u63d0\u9ad8\u6d6e\u70b9\u6570\u7684\u4f4d\u6570\u3001\u5229\u7528\u7b2c\u4e09\u65b9\u5e93\u7b49\u65b9\u6cd5\u6765\u89e3\u51b3\u3002<\/strong> \u5176\u4e2d\uff0c\u4f7f\u7528BigDecimal<\/code>\u7c7b<\/strong>\u662f\u89e3\u51b3\u6d6e\u70b9\u6570\u7cbe\u5ea6\u95ee\u9898\u7684\u5e38\u7528\u4e14\u6709\u6548\u65b9\u6cd5\u3002\u901a\u8fc7\u4f7f\u7528BigDecimal<\/code>\u7c7b\uff0c\u53ef\u4ee5\u5728\u6267\u884c\u7b97\u672f\u3001\u7f29\u653e\u3001\u820d\u5165\u7b49\u64cd\u4f5c\u65f6\u63d0\u4f9b\u5b8c\u5168\u53ef\u63a7\u7684\u7cbe\u5ea6\uff0c\u4ece\u800c\u907f\u514d\u4e86\u6d6e\u70b9\u6570\u76f4\u63a5\u8fd0\u7b97\u5e26\u6765\u7684\u95ee\u9898\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u4f7f\u7528BigDecimal<\/code><\/h3>\n<\/p>\n
    \n
  • \n

    \u7cbe\u5ea6\u63a7\u5236<\/strong>\uff1aBigDecimal<\/code>\u63d0\u4f9b\u4e86\u64cd\u4f5c\u5927\u6570\u5b57\u7684\u7cbe\u786e\u65b9\u6cd5\uff0c\u53ef\u4ee5\u7528\u4e8e\u91d1\u989d\u3001\u79d1\u5b66\u8ba1\u7b97\u7b49\u9886\u57df\u3002\u901a\u8fc7\u5176\u6784\u9020\u51fd\u6570\u6216\u8005valueOf<\/code>\u65b9\u6cd5\uff0c\u53ef\u4ee5\u51c6\u786e\u5730\u8868\u793a\u4e00\u4e2a\u6d6e\u70b9\u6570\uff0c\u907f\u514d\u4e86\u4f7f\u7528\u539f\u751f\u6d6e\u70b9\u7c7b\u578b\u65f6\u7531\u4e8e\u4f4d\u9650\u5236\u800c\u4ea7\u751f\u7684\u7cbe\u5ea6\u4e22\u5931\u95ee\u9898\u3002<\/p>\n<\/p>\n<\/li>\n

  • \n

    \u8fd0\u7b97\u5b89\u5168<\/strong>\uff1a\u76f8\u8f83\u4e8efloat<\/code>\u6216double<\/code>\u7c7b\u578b\u8fdb\u884c\u8fd0\u7b97\uff0cBigDecimal<\/code>\u63d0\u4f9b\u4e86\u4e00\u7cfb\u5217\u65b9\u6cd5\uff08\u5982add<\/code>\u3001subtract<\/code>\u3001multiply<\/code>\u3001divide<\/code>\uff09\u6765\u5904\u7406\u6570\u5b57\u8fd0\u7b97\uff0c\u8fd9\u4e9b\u65b9\u6cd5\u5728\u5904\u7406\u8fc7\u7a0b\u4e2d\u90fd\u4f1a\u4fdd\u6301\u6570\u5b57\u7684\u7cbe\u5ea6\u4e0d\u4e22\u5931\u3002<\/p>\n<\/p>\n<\/li>\n<\/ul>\n

    \u4e8c\u3001\u907f\u514d\u76f4\u63a5\u6bd4\u8f83\u6d6e\u70b9\u6570<\/h3>\n<\/p>\n
      \n
    • \n

      \u6bd4\u8f83\u7b56\u7565<\/strong>\uff1a\u76f4\u63a5\u6bd4\u8f83\u6d6e\u70b9\u6570\u5f80\u5f80\u4e0d\u662f\u4e00\u4e2a\u597d\u7684\u7b56\u7565\uff0c\u56e0\u4e3a\u5373\u4f7f\u4e24\u4e2a\u6d6e\u70b9\u6570\u770b\u8d77\u6765\u76f8\u540c\uff0c\u7531\u4e8e\u7cbe\u5ea6\u95ee\u9898\u4e5f\u53ef\u80fd\u4e0d\u5b8c\u5168\u4e00\u81f4\u3002\u4e00\u79cd\u5e38\u89c1\u7684\u89e3\u51b3\u7b56\u7565\u662f\u8bbe\u7f6e\u4e00\u4e2a\u975e\u5e38\u5c0f\u7684\u5dee\u503c\uff08epsilon\uff09\uff0c\u53ea\u6709\u5f53\u4e24\u4e2a\u6d6e\u70b9\u6570\u4e4b\u95f4\u7684\u5dee\u5f02\u8d85\u8fc7\u8fd9\u4e2a\u5dee\u503c\u65f6\u624d\u8ba4\u4e3a\u5b83\u4eec\u4e0d\u76f8\u7b49\u3002<\/p>\n<\/p>\n<\/li>\n

    • \n

      \u5b9e\u4f8b\u6f14\u793a<\/strong>\uff1a\u53ef\u4ee5\u901a\u8fc7\u9884\u5b9a\u4e49\u4e00\u4e2a\u975e\u5e38\u5c0f\u7684\u6570\uff08\u6bd4\u59821e-6<\/code>\uff09\uff0c\u5728\u6bd4\u8f83\u4e24\u4e2a\u6d6e\u70b9\u6570a<\/code>\u548cb<\/code>\u662f\u5426\u76f8\u7b49\u65f6\uff0c\u5224\u65adMath.abs(a - b) < 1e-6<\/code>\uff0c\u4ee5\u6b64\u6765\u51cf\u5c11\u76f4\u63a5\u6bd4\u8f83\u5bfc\u81f4\u7684\u7cbe\u5ea6\u8bef\u5dee\u3002<\/p>\n<\/p>\n<\/li>\n<\/ul>\n

      \u4e09\u3001\u4f7f\u7528\u5b57\u7b26\u4e32\u8fdb\u884c\u8fd0\u7b97<\/h3>\n<\/p>\n
        \n
      • \n

        \u907f\u514d\u7cbe\u5ea6\u635f\u5931<\/strong>\uff1a\u53e6\u4e00\u79cd\u65b9\u6cd5\u662f\u5c06\u6d6e\u70b9\u6570\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\u8fdb\u884c\u64cd\u4f5c\uff0c\u7136\u540e\u518d\u5c06\u7ed3\u679c\u8f6c\u56de\u6d6e\u70b9\u6570\u3002\u8fd9\u79cd\u65b9\u6cd5\u53ef\u4ee5\u5728\u4e00\u5b9a\u7a0b\u5ea6\u4e0a\u907f\u514d\u5728\u8f6c\u6362\u8fc7\u7a0b\u4e2d\u7684\u7cbe\u5ea6\u4e22\u5931\uff0c\u5c24\u5176\u9002\u7528\u4e8e\u9700\u8981\u9ad8\u5ea6\u7cbe\u5ea6\u8ba1\u7b97\u7684\u573a\u5408\u3002<\/p>\n<\/p>\n<\/li>\n

      • \n

        \u5b9e\u8df5\u6ce8\u610f<\/strong>\uff1a\u867d\u7136\u8fd9\u79cd\u65b9\u6cd5\u53ef\u4ee5\u4fdd\u7559\u8f83\u9ad8\u7684\u7cbe\u5ea6\uff0c\u4f46\u662f\u5904\u7406\u901f\u5ea6\u76f8\u5bf9\u8f83\u6162\uff0c\u5e76\u4e14\u9700\u8981\u5f00\u53d1\u8005\u81ea\u884c\u5b9e\u73b0\u8fd0\u7b97\u903b\u8f91\uff0c\u589e\u52a0\u4e86\u5f00\u53d1\u7684\u590d\u6742\u5ea6\u3002<\/p>\n<\/p>\n<\/li>\n<\/ul>\n

        \u56db\u3001\u63d0\u9ad8\u6d6e\u70b9\u6570\u7684\u4f4d\u6570<\/h3>\n<\/p>\n
          \n
        • \n

          \u589e\u52a0\u7cbe\u5ea6<\/strong>\uff1a\u5728\u4e0d\u4f7f\u7528BigDecimal<\/code>\u7684\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u901a\u8fc7\u63d0\u9ad8\u6d6e\u70b9\u6570\u7684\u4f4d\u6570\u6765\u51cf\u5c11\u7cbe\u5ea6\u635f\u5931\u3002\u4f8b\u5982\uff0c\u5c3d\u53ef\u80fd\u4f7f\u7528double<\/code>\u7c7b\u578b\u800c\u4e0d\u662ffloat<\/code>\u7c7b\u578b\uff0c\u56e0\u4e3adouble<\/code>\u63d0\u4f9b\u4e86\u6bd4float<\/code>\u66f4\u9ad8\u7684\u7cbe\u5ea6\u3002<\/p>\n<\/p>\n<\/li>\n

        • \n

          \u6743\u8861\u9009\u62e9<\/strong>\uff1a\u63d0\u9ad8\u6d6e\u70b9\u6570\u7684\u4f4d\u6570\u867d\u7136\u53ef\u4ee5\u5728\u4e00\u5b9a\u7a0b\u5ea6\u4e0a\u89e3\u51b3\u7cbe\u5ea6\u95ee\u9898\uff0c\u4f46\u540c\u65f6\u4e5f\u589e\u52a0\u4e86\u5185\u5b58\u7684\u6d88\u8017\u3002\u56e0\u6b64\uff0c\u5728\u9009\u62e9\u65f6\u9700\u8981\u6839\u636e\u5b9e\u9645\u60c5\u51b5\u505a\u51fa\u6743\u8861\u3002<\/p>\n<\/p>\n<\/li>\n<\/ul>\n

          \u4e94\u3001\u5229\u7528\u7b2c\u4e09\u65b9\u5e93<\/h3>\n<\/p>\n
            \n
          • \n

            \u7b2c\u4e09\u65b9\u89e3\u51b3\u65b9\u6848<\/strong>\uff1a\u9664\u4e86Java\u81ea\u5e26\u7684\u89e3\u51b3\u65b9\u6848\u5916\uff0c\u8fd8\u53ef\u4ee5\u8003\u8651\u4f7f\u7528\u7b2c\u4e09\u65b9\u5e93\u6765\u5904\u7406\u6d6e\u70b9\u6570\u7684\u7cbe\u5ea6\u95ee\u9898\u3002\u4f8b\u5982Apache Commons Math\u5e93\u63d0\u4f9b\u4e86\u4e00\u7cfb\u5217\u4e0e\u6570\u5b66\u8fd0\u7b97\u76f8\u5173\u7684\u5de5\u5177\u7c7b\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u89e3\u51b3\u7cbe\u5ea6\u4e22\u5931\u95ee\u9898\u3002<\/p>\n<\/p>\n<\/li>\n

          • \n

            \u5b9e\u73b0\u4fbf\u6377<\/strong>\uff1a\u4f7f\u7528\u7b2c\u4e09\u65b9\u5e93\u53ef\u4ee5\u5927\u5927\u7b80\u5316\u5f00\u53d1\u5de5\u4f5c\uff0c\u56e0\u4e3a\u8fd9\u4e9b\u5e93\u5df2\u7ecf\u63d0\u4f9b\u4e86\u6210\u719f\u7684\u89e3\u51b3\u65b9\u6848\uff0c\u5f00\u53d1\u8005\u53ea\u9700\u8981\u6309\u7167\u5e93\u7684\u8981\u6c42\u4f7f\u7528\u76f8\u5e94\u529f\u80fd\u5373\u53ef\u3002\u4f46\u662f\uff0c\u4f7f\u7528\u7b2c\u4e09\u65b9\u5e93\u4e5f\u610f\u5473\u7740\u589e\u52a0\u4e86\u9879\u76ee\u7684\u5916\u90e8\u4f9d\u8d56\u3002<\/p>\n<\/p>\n<\/li>\n<\/ul>\n

            \u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n

            Q: \u4e3a\u4ec0\u4e48\u5728Java\u9879\u76ee\u4e2d\u4f1a\u51fa\u73b0\u6d6e\u70b9\u6570\u7cbe\u5ea6\u4e22\u5931\u7684\u95ee\u9898\uff1f<\/strong><\/p>\n

            A: \u6d6e\u70b9\u6570\u7cbe\u5ea6\u4e22\u5931\u662f\u56e0\u4e3a\u8ba1\u7b97\u673a\u5728\u5904\u7406\u6d6e\u70b9\u6570\u65f6\u91c7\u7528\u4e8c\u8fdb\u5236\u8868\u793a\uff0c\u800c\u6d6e\u70b9\u6570\u7684\u5341\u8fdb\u5236\u8868\u793a\u53ef\u80fd\u65e0\u6cd5\u5b8c\u5168\u51c6\u786e\u5730\u8f6c\u6362\u4e3a\u4e8c\u8fdb\u5236\u8868\u793a\u3002\u8fd9\u5bfc\u81f4\u4e86\u7cbe\u5ea6\u7684\u635f\u5931\uff0c\u5373\u5c0f\u6570\u90e8\u5206\u53ef\u80fd\u4e0d\u51c6\u786e\u3002<\/p>\n

            Q: \u5982\u4f55\u907f\u514d\u5728Java\u9879\u76ee\u4e2d\u51fa\u73b0\u6d6e\u70b9\u6570\u7cbe\u5ea6\u4e22\u5931\u7684\u95ee\u9898\uff1f<\/strong><\/p>\n

            A: \u6709\u51e0\u79cd\u65b9\u6cd5\u53ef\u4ee5\u907f\u514d\u6d6e\u70b9\u6570\u7cbe\u5ea6\u4e22\u5931\u3002\u4e00\u79cd\u65b9\u6cd5\u662f\u4f7f\u7528BigDecimal\u7c7b\u6765\u8fdb\u884c\u9ad8\u7cbe\u5ea6\u7684\u8ba1\u7b97\uff0c\u907f\u514d\u5c06\u6d6e\u70b9\u6570\u76f4\u63a5\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u3002\u53e6\u4e00\u79cd\u65b9\u6cd5\u662f\u4f7f\u7528\u6574\u6570\u6765\u4ee3\u66ff\u6d6e\u70b9\u6570\u8fdb\u884c\u8ba1\u7b97\uff0c\u7136\u540e\u5bf9\u7ed3\u679c\u8fdb\u884c\u9664\u6cd5\u8fd0\u7b97\u4ee5\u5f97\u5230\u671f\u671b\u7684\u5c0f\u6570\u4f4d\u6570\u3002<\/p>\n

            Q: \u5982\u679c\u65e0\u6cd5\u907f\u514d\u6d6e\u70b9\u6570\u7cbe\u5ea6\u4e22\u5931\uff0c\u5982\u4f55\u5728Java\u9879\u76ee\u4e2d\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff1f<\/strong><\/p>\n

            A: \u5982\u679c\u65e0\u6cd5\u907f\u514d\u6d6e\u70b9\u6570\u7cbe\u5ea6\u4e22\u5931\uff0c\u53ef\u4ee5\u4f7f\u7528Math\u7c7b\u4e2d\u7684\u4e00\u4e9b\u65b9\u6cd5\u6765\u5904\u7406\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528Math.round\u65b9\u6cd5\u8fdb\u884c\u56db\u820d\u4e94\u5165\uff0c\u6216\u8005\u4f7f\u7528Math.floor\u548cMath.ceil\u65b9\u6cd5\u8fdb\u884c\u5411\u4e0b\u53d6\u6574\u548c\u5411\u4e0a\u53d6\u6574\u3002\u53e6\u5916\uff0c\u53ef\u4ee5\u6839\u636e\u5177\u4f53\u60c5\u51b5\u5bf9\u6d6e\u70b9\u6570\u8fdb\u884c\u9002\u5f53\u7684\u820d\u5165\u6216\u622a\u65ad\u64cd\u4f5c\uff0c\u4ee5\u6ee1\u8db3\u9879\u76ee\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"Java \u9879\u76ee\u4e2d\u6d6e\u70b9\u6570\u7cbe\u5ea6\u4e22\u5931\u7684\u95ee\u9898\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528BigDecimal\u7c7b\u3001\u907f\u514d\u76f4\u63a5\u6bd4\u8f83\u6d6e\u70b9\u6570\u3001\u4f7f\u7528\u5b57\u7b26\u4e32\u8fdb\u884c\u8fd0\u7b97 […]","protected":false},"author":3,"featured_media":312161,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/312134"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=312134"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/312134\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/312161"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=312134"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=312134"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=312134"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}