{"id":21804,"date":"2017-04-24T13:25:17","date_gmt":"2017-04-24T04:25:17","guid":{"rendered":"http:\/\/www.sejuku.net\/blog\/?p=21804"},"modified":"2024-05-06T11:41:48","modified_gmt":"2024-05-06T02:41:48","slug":"%e3%80%90java%e5%85%a5%e9%96%80%e3%80%91bigdecimal%e3%81%ae%e8%a8%88%e7%ae%97%e6%96%b9%e6%b3%95%e3%81%be%e3%81%a8%e3%82%81","status":"publish","type":"post","link":"https:\/\/www.sejuku.net\/blog\/21804","title":{"rendered":"\u3010Java\u5165\u9580\u3011BigDecimal\u3067\u5c0f\u6570\u70b9\u4ee5\u4e0b\u3092\u8aa4\u5dee\u306a\u304f\u8a08\u7b97\u3059\u308b\u65b9\u6cd5"},"content":{"rendered":"

\u3053\u3093\u306b\u3061\u306f\uff01\u30d5\u30ea\u30fc\u30e9\u30f3\u30b9\u306e\u6843\u592a\u90ce\u3067\u3059\u3002<\/p>\n

Java\u306b\u306f\u8aa4\u5dee\u304c\u51fa\u306a\u3044\u3088\u3046\u306b\u56db\u5247\u6f14\u7b97<\/strong><\/span>\u3059\u308b\u305f\u3081\u306e\u30af\u30e9\u30b9\u3068\u3057\u3066BigDecimal<\/strong><\/span>\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001<\/p>\n

\u30fbBigDecimal\u3068\u306f<\/strong><\/span>
\n\u30fbBigDecimal\u306e\u4f7f\u3044\u65b9<\/strong><\/span><\/p>\n

\u3068\u3044\u3046\u57fa\u672c\u7684\u306a\u5185\u5bb9\u304b\u3089\u3001<\/p>\n

\u30fbBigDecimal\u3067\u56db\u6368\u4e94\u5165\u3059\u308b\u65b9\u6cd5<\/strong><\/span>
\n\u30fbBigDecimal\u306b\u3066\u6d88\u8cbb\u7a0e\u306e\u8a08\u7b97\u3092\u3059\u308b\u65b9\u6cd5<\/strong><\/span><\/p>\n

\u306a\u3069\u306e\u5fdc\u7528\u7684\u306a\u4f7f\u3044\u65b9\u306b\u95a2\u3057\u3066\u3082\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n

BigDecimal\u306b\u3064\u3044\u3066\u6b63\u3057\u304f\u7406\u89e3\u3057\u3001\u5fc5\u8981\u306a\u5834\u9762\u3067\u4f7f\u3044\u3053\u306a\u3059\u3053\u3068\u304c\u3067\u304d\u308b\u3088\u3046\u306b\u3001\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3057\u307e\u3059\uff01<\/p>\n

\u306a\u304a\u3001Java\u306e\u8a18\u4e8b\u306b\u3064\u3044\u3066\u306f\u3001\u3053\u3061\u3089<\/a>\u306b\u307e\u3068\u3081\u3066\u3044\u307e\u3059\u3002<\/p>\n

BigDecimal\u3068\u306f<\/h2>\n

BigDecimal<\/strong><\/span>\u3068\u306fJava\u306e\u30af\u30e9\u30b9\u306e\u3072\u3068\u3064\u3067\u3001\u5c0f\u6570\u70b9\u4ee5\u4e0b\u306e\u6570\u5024\u3092\u542b\u3081\u305f\u5b9f\u6570<\/strong><\/span>\u3092\u53d6\u308a\u6271\u3044\u307e\u3059\u3002<\/p>\n

\u30af\u30e9\u30b9\u306e\u5185\u90e8\u3067\u306f\u5b9f\u6570\u3092\u201d\u6574\u6570\u201d\u3068\u201d\u5c0f\u6570\u70b9\u306e\u4f4d\u7f6e\u201d\u3068\u3044\u30462\u3064\u306e\u60c5\u5831\u306b\u5206\u3051\u3066\u7ba1\u7406\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n

\u307e\u305f\u3001BigDecimal\u540c\u58eb\u306e\u5024\u306e\u6bd4\u8f03\u65b9\u6cd5\u306b\u3064\u3044\u3066\u306f\u4ee5\u4e0b\u306e\u8a18\u4e8b\u3092\u53c2\u8003\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n \n

\n
\n
\n \n <\/div>\n
\n
\u3010Java\u5165\u9580\u3011BigDecimal\u306e\u5927\u5c0f\u3092compareTo\u3067\u6bd4\u8f03\u3059\u308b\u65b9\u6cd5<\/div>\n
\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/a>\n \n

BigDicimal\u3067\u5c0f\u6570\u70b9\u4ee5\u4e0b\u3092\u8a08\u7b97\u3059\u308b\u65b9\u6cd5<\/h2>\n

\u9280\u884c\u306e\u9810\u91d1\u91d1\u5229\u3084\u30e2\u30ce\u3092\u8cb7\u3046\u3068\u304d\u306b\u767a\u751f\u3059\u308b\u6d88\u8cbb\u7a0e\u306a\u3069\u3001\u5c0f\u6570\u70b9\u4ee5\u4e0b\u306e\u6570\u5b57\u3092\u3042\u3064\u304b\u3046IT\u30b7\u30b9\u30c6\u30e0\u306f\u591a\u304f\u5b58\u5728\u3057\u307e\u3059\u3002<\/p>\n

\u305d\u308c\u3089\u306e\u30b7\u30b9\u30c6\u30e0\u3067\u306f\uff11\u5186\u306e\u8aa4\u5dee\u3082\u8a31\u3055\u308c\u306a\u3044\u6b63\u78ba\u306a\u8a08\u7b97<\/strong><\/span>\u304c\u5fc5\u8981\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n

\u305d\u306e\u3088\u3046\u306a\u5834\u5408\u306b\u4f7f\u7528\u3059\u308b\u306e\u304cBigDecimal<\/strong><\/span>\u3067\u3059\u3002<\/p>\n

Java\u3067\u306f\u5c0f\u6570\u70b9\u4ee5\u4e0b\u3092\u6271\u3048\u308bdouble\/float\u3068\u3044\u3063\u305f\u4ed6\u306e\u30af\u30e9\u30b9\u3082\u5b58\u5728\u3057\u307e\u3059\u3002<\/p>\n

\u305f\u3060\u3057\u3001double\/float\u306f\u8aa4\u5dee\u304c\u751f\u3058\u308b<\/strong><\/span>\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

\u6b63\u78ba\u306a\u8a08\u7b97<\/strong><\/span>\u304c\u5fc5\u8981\u306a\u5834\u9762\u3067\u306fBigDecimal<\/strong><\/span>\u3092\u4f7f\u7528\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n

\u305d\u3057\u3066\u3001BigDecimal\u3067\u306f\u56db\u5247\u6f14\u7b97\u3092\u884c\u3046\u5834\u5408\u3001\u201d+\u201d\u3084\u201d-\u201c\u3068\u3044\u3063\u305f\u7b97\u8853\u6f14\u7b97\u5b50<\/strong><\/span>\u3067\u306f\u306a\u304f\u5c02\u7528\u306e\u30e1\u30bd\u30c3\u30c9\u304c\u7528\u610f<\/strong><\/span>\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n\n\t\n\n\t\n\t\n\t\n\t
\u30e1\u30bd\u30c3\u30c9<\/th>\u8aac\u660e<\/th>\n<\/tr>\n<\/thead>\n
add()<\/td>\u8db3\u3057\u7b97<\/td>\n<\/tr>\n
subtract()<\/td>\u5f15\u304d\u7b97<\/td>\n<\/tr>\n
multiply()<\/td>\u639b\u3051\u7b97<\/td>\n<\/tr>\n
divide()<\/td>\u5272\u308a\u7b97<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n

BigDecimal\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3059\u308b\u306b\u306f\u3001\u4ee5\u4e0b\u306e\u30d1\u30c3\u30b1\u30fc\u30b8\u3092\u30a4\u30f3\u30dd\u30fc\u30c8\u3057\u307e\u3059\u3002<\/p>\n

import java.math.BigDecimal;<\/pre>\n
\u4f8b\u3048\u3070\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u4f5c\u6210\u3057\u3066\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n
String val = \u201c123.456789\u201d;\r\nBigDecimal bd = new BigDecimal(val);<\/pre>\n
\u8db3\u3057\u7b97<\/h3>\n
\u8db3\u3057\u7b97<\/strong><\/span>\u3092\u884c\u3046\u5834\u5408\u306f add<\/strong><\/span>\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n
add\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u306b\u306f\u8db3\u3057\u5408\u308f\u305b\u305f\u3044\u5024<\/strong><\/span>\u3092\u5165\u308c\u307e\u3059\u3002<\/p>\n
\u623b\u308a\u5024\u306f\u8db3\u3057\u5408\u308f\u305b\u305f\u7d50\u679c\u304cBigDecimal\u578b\u3067\u8fd4\u308a\u307e\u3059\u3002<\/p>\n
BigDecimal\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u5f15\u6570\u306b\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u578b<\/strong><\/span>\u3068\u6587\u5b57\u5217\u578b<\/strong><\/span>\u3069\u3061\u3089\u3082\u6307\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u3057\u304b\u3057\u3001\u5f15\u6570\u306b\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u578b\u3092\u6307\u5b9a\u3057\u305f\u5834\u5408\u3001\u8aa4\u5dee\u304c\u767a\u751f<\/strong><\/span>\u3059\u308b\u306e\u3067\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n
\u6b63\u78ba\u306a\u5024\u3092\u6271\u3046\u305f\u3081\u306b\u306f\u3001BigDecimal\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u5f15\u6570\u306f\u6587\u5b57\u5217\u578b\u3067\u6307\u5b9a<\/strong><\/span>\u3057\u307e\u3057\u3087\u3046\uff01<\/p>\n
import java.math.BigDecimal;\r\n\r\npublic class Main {\r\n \r\n    public static void main(String[] args) {\r\n        \/\/ double\u578b\u3067\u7b97\u8853\u6f14\u7b97\u5b50\u3092\u4f7f\u3046\u5834\u5408\r\n        double d1 = 0.8;\r\n        double d2 = 0.9;\r\n        System.out.println(d1 + \" + \" + d2 + \" = \" + (d1 + d2));\r\n        \r\n        \/\/ BigDecimal\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u5f15\u6570\u306bdouble\u578b\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408\r\n        BigDecimal bd1 = new BigDecimal(0.8);\r\n        BigDecimal bd2 = new BigDecimal(0.9);\r\n        BigDecimal result1 = bd2.add(bd1);\r\n        System.out.println(bd1 + \" + \" + bd2 + \" = \" + result1);\r\n        \r\n        \/\/ BigDecimal\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u5f15\u6570\u306bString\u578b\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408\r\n        BigDecimal bd3 = new BigDecimal(\"0.8\");\r\n        BigDecimal bd4 = new BigDecimal(\"0.9\");\r\n        BigDecimal result2 = bd4.add(bd3);\r\n        System.out.println(bd3 + \" + \" + bd4 + \" = \" + result2);\r\n    }\r\n\r\n}<\/pre>\n
\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n
0.8 + 0.9 = 1.7000000000000002\r\n0.8000000000000000444089209850062616169452667236328125 + 0.90000000000000002220446049250313080847263336181640625 = 1.70000000000000006661338147750939242541790008544921875\r\n0.8 + 0.9 = 1.7<\/pre>\n
\u3053\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u306f\u3001double\u578b\u3067\u7b97\u8853\u6f14\u7b97\u5b50\u3092\u4f7f\u3063\u305f\u5834\u5408\u3068\u3001BigDecimal\u578b\u3067\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u5f15\u6570\u306bdouble\u578b\u3068String\u578b\u3092\u4f7f\u3063\u305f\u5834\u5408\u3067\u8db3\u3057\u7b97\u306e\u7d50\u679c\u3092\u6bd4\u8f03\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
double\u578b\u3067\u7b97\u8853\u6f14\u7b97\u5b50\u3092\u4f7f\u3063\u305f\u5834\u5408\u3068BigDecimal\u578b\u3067\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u5f15\u6570\u306bdouble\u578b\u3092\u4f7f\u3063\u305f\u5834\u5408\u306f\u8aa4\u5dee\u304c\u751f\u3058\u3066\u6b63\u78ba\u306a\u5024\u304c\u7b97\u51fa\u3067\u304d\u3066\u3044\u307e\u305b\u3093<\/strong><\/span>\u3002<\/p>\n
\u3053\u308c\u306b\u5bfe\u3057\u3066\u3001BigDecimal\u578b\u3067\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u5f15\u6570\u306bString\u578b\u3092\u4f7f\u3063\u305f\u5834\u5408\u306f\u8aa4\u5dee\u306f\u751f\u3058\u305a\u3001\u6b63\u78ba\u306a\u5024\u3092\u7b97\u51fa<\/strong><\/span>\u3067\u304d\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u5f15\u304d\u7b97<\/h3>\n
\u5f15\u304d\u7b97<\/strong><\/span>\u3092\u884c\u3046\u5834\u5408\u306f subtract<\/strong><\/span>\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n
import java.math.BigDecimal;\r\n\r\npublic class Main {\r\n \r\n    public static void main(String[] args) {\r\n        \/\/ double\u578b\u3067\u7b97\u8853\u6f14\u7b97\u5b50\u3092\u4f7f\u3046\u5834\u5408\r\n        double d1 = 1.7;\r\n        double d2 = 0.9;\r\n        System.out.println(d1 + \" - \" + d2 + \" = \" + (d1 - d2));\r\n        \r\n        \/\/ BigDecimal\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u5f15\u6570\u306bdouble\u578b\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408\r\n        BigDecimal bd1 = new BigDecimal(1.7);\r\n        BigDecimal bd2 = new BigDecimal(0.9);\r\n        BigDecimal result1 = bd1.subtract(bd2);\r\n        System.out.println(bd1 + \" - \" + bd2 + \" = \" + result1);\r\n        \r\n        \/\/ BigDecimal\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u5f15\u6570\u306bString\u578b\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408\r\n        BigDecimal bd3 = new BigDecimal(\"1.7\");\r\n        BigDecimal bd4 = new BigDecimal(\"0.9\");\r\n        BigDecimal result2 = bd3.subtract(bd4);\r\n        System.out.println(bd3 + \" - \" + bd4 + \" = \" + result2);    \r\n    }\r\n\r\n}<\/pre>\n
\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n
1.7 - 0.9 = 0.7999999999999999\r\n1.6999999999999999555910790149937383830547332763671875 - 0.90000000000000002220446049250313080847263336181640625 = 0.79999999999999993338661852249060757458209991455078125\r\n1.7 - 0.9 = 0.8<\/pre>\n
\u3053\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u3082\u3001double\u578b\u3067\u7b97\u8853\u6f14\u7b97\u5b50\u3092\u4f7f\u3063\u305f\u5834\u5408\u3068BigDecimal\u578b\u3067\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u5f15\u6570\u306bdouble\u578b\u3092\u4f7f\u3063\u305f\u5834\u5408\u306f\u8aa4\u5dee\u304c\u751f\u3058\u3066\u6b63\u78ba\u306a\u5024\u304c\u7b97\u51fa\u3067\u304d\u3066\u3044\u307e\u305b\u3093\u3002<\/strong><\/span><\/p>\n
\u3053\u308c\u306b\u5bfe\u3057\u3066\u3001BigDecimal\u578b\u3067\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u5f15\u6570\u306bString\u578b\u3092\u4f7f\u3063\u305f\u5834\u5408\u306f\u8aa4\u5dee\u306f\u751f\u3058\u305a\u3001\u6b63\u78ba\u306a\u5024\u3092\u7b97\u51fa<\/strong><\/span>\u3067\u304d\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u639b\u3051\u7b97<\/h3>\n
\u639b\u3051\u7b97<\/strong><\/span>\u3092\u884c\u3046\u5834\u5408\u306f multiply<\/strong><\/span>\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n
import java.math.BigDecimal;\r\n\r\npublic class Main {\r\n \r\n    public static void main(String[] args) {\r\n        \/\/ double\u578b\u3067\u7b97\u8853\u6f14\u7b97\u5b50\u3092\u4f7f\u3046\u5834\u5408\r\n        double d1 = 0.8;\r\n        double d2 = 0.9;\r\n        System.out.println(d1 + \" x \" + d2 + \" = \" + (d1 * d2));\r\n        \r\n        \/\/ BigDecimal\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u5f15\u6570\u306bdouble\u578b\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408\r\n        BigDecimal bd1 = new BigDecimal(0.8);\r\n        BigDecimal bd2 = new BigDecimal(0.9);\r\n        BigDecimal result1 = bd1.multiply(bd2);\r\n        System.out.println(bd1 + \" x \" + bd2 + \" = \" + result1);\r\n        \r\n        \/\/ BigDecimal\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u5f15\u6570\u306bString\u578b\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408\r\n        BigDecimal bd3 = new BigDecimal(\"0.8\");\r\n        BigDecimal bd4 = new BigDecimal(\"0.9\");\r\n        BigDecimal result2 = bd3.multiply(bd4);\r\n        System.out.println(bd3 + \" x \" + bd4 + \" = \" + result2);    \r\n    }\r\n\r\n}<\/pre>\n
\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n
0.8 x 0.9 = 0.7200000000000001\r\n0.8000000000000000444089209850062616169452667236328125 x 0.90000000000000002220446049250313080847263336181640625 = 0.720000000000000057731597280508141088104978266987413014660706603482787091508043886278755962848663330078125\r\n0.8 x 0.9 = 0.72<\/pre>\n
\u3053\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u3082\u3001double\u578b\u3067\u7b97\u8853\u6f14\u7b97\u5b50\u3092\u4f7f\u3063\u305f\u5834\u5408\u3068BigDecimal\u578b\u3067\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u5f15\u6570\u306bdouble\u578b\u3092\u4f7f\u3063\u305f\u5834\u5408\u306f\u8aa4\u5dee\u304c\u751f\u3058\u3066\u6b63\u78ba\u306a\u5024\u304c\u7b97\u51fa\u3067\u304d\u3066\u3044\u307e\u305b\u3093<\/strong><\/span>\u3002<\/p>\n
\u3053\u308c\u306b\u5bfe\u3057\u3066\u3001BigDecimal\u578b\u3067\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u5f15\u6570\u306bString\u578b\u3092\u4f7f\u3063\u305f\u5834\u5408\u306f\u8aa4\u5dee\u306f\u751f\u3058\u305a\u3001\u6b63\u78ba\u306a\u5024\u3092\u7b97\u51fa<\/strong><\/span>\u3067\u304d\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u5272\u308a\u7b97<\/h3>\n
\u5272\u308a\u7b97<\/strong><\/span>\u3092\u884c\u3046\u5834\u5408\u306f divide<\/strong><\/span>\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n
\u5272\u308a\u7b97\u306e\u5834\u5408\u306f\u6c17\u3092\u3064\u3051\u308b\u3079\u304d\u70b9\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
\u305f\u3068\u3048\u3070\u300110 \u00f7 3 = 3.33333\u2026 \u306e\u3088\u3046\u306a\u7d50\u679c\u304c\u5272\u308a\u5207\u308c\u306a\u3044\u5024\u306e\u5834\u5408\u3001ArithmeticException\u3068\u3044\u3046\u30a8\u30e9\u30fc\u304c\u767a\u751f<\/strong><\/span>\u3057\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/p>\n
\u305d\u308c\u3092\u56de\u907f\u3059\u308b\u305f\u3081\u306b\u3001BigDecimal\u3067\u306f\u5404\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u306b\u7b2c\u4e8c\u5f15\u6570\u4ee5\u964d\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u305d\u306e\u7b2c3\u5f15\u6570\u306b\u8a08\u7b97\u7d50\u679c\u306e\u5024\u306e\u4e38\u3081\u65b9\u6cd5\u3092\u6307\u5b9a<\/strong><\/span>\u3059\u308b\u3053\u3068\u3067\u3001\u30a8\u30e9\u30fc\u3092\u56de\u907f\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u3061\u306a\u307f\u306b\u7b2c2\u5f15\u6570\u3067\u306f\u5c0f\u6570\u70b9\u4ee5\u4e0b\u306e\u6841\u6570\u3092\u6307\u5b9a<\/strong><\/span>\u3057\u307e\u3059\u3002<\/p>\n
import java.math.BigDecimal;\r\n\r\npublic class Main {\r\n \r\n    public static void main(String[] args) {\r\n        \/\/ double\u578b\u3067\u7b97\u8853\u6f14\u7b97\u5b50\u3092\u4f7f\u3046\u5834\u5408\r\n        double d1 = 10.0;\r\n        double d2 = 3.0;\r\n        System.out.println(d1 + \" \u00f7 \" + d2 + \" = \" + (d1 \/ d2));\r\n        \r\n        \/\/ BigDecimal\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u5f15\u6570\u306bdouble\u578b\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408\r\n        BigDecimal bd1 = new BigDecimal(10.0);\r\n        BigDecimal bd2 = new BigDecimal(3.0);\r\n        BigDecimal result1 = bd1.divide(bd2, 1, BigDecimal.ROUND_HALF_UP);\r\n        System.out.println(bd1 + \" \u00f7 \" + bd2 + \" = \" + result1);\r\n        \r\n        \/\/ BigDecimal\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u5f15\u6570\u306bString\u578b\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408\r\n        BigDecimal bd3 = new BigDecimal(\"10.0\");\r\n        BigDecimal bd4 = new BigDecimal(\"3.0\");\r\n        BigDecimal result2 = bd3.divide(bd4, 1, BigDecimal.ROUND_HALF_UP);\r\n        System.out.println(bd3 + \" \u00f7 \" + bd4 + \" = \" + result2);    \r\n    }\r\n\r\n}<\/pre>\n
\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n
10.0 \u00f7 3.0 = 3.3333333333333335\r\n10 \u00f7 3 = 3.3\r\n10.0 \u00f7 3.0 = 3.3<\/pre>\n
\u3053\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u306f\u3001double\u578b\u3067\u7b97\u8853\u6f14\u7b97\u5b50\u3092\u4f7f\u3063\u305f\u5834\u5408\u306f\u8aa4\u5dee\u304c\u751f\u3058\u3066\u6b63\u78ba\u306a\u5024\u304c\u7b97\u51fa\u3067\u304d\u3066\u3044\u307e\u305b\u3093<\/strong><\/span>\u3002<\/p>\n
\u3053\u308c\u306b\u5bfe\u3057\u3066\u3001BigDecimal\u578b\u3092\u4f7f\u3063\u305f\u5834\u5408\u306f\u8aa4\u5dee\u306f\u751f\u3058\u305a\u3001\u6b63\u78ba\u306a\u5024\u3092\u7b97\u51fa<\/strong><\/span>\u3067\u304d\u3066\u3044\u307e\u3059\u3002<\/p>\n
BigDecimal\u3067\u56db\u6368\u4e94\u5165\u3059\u308b\u65b9\u6cd5<\/h2>\n
BigDecimal\u3067\u56db\u6368\u4e94\u5165\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u306f\u4ee5\u4e0b\u306e\u8a18\u4e8b\u3092\u53c2\u8003\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n            \n                
\n                
\n                    
\n                    \n                    <\/div>\n                    
\n                    
\u3010\u89e3\u6c7aJava\u3011BigDecimal\u3067\u56db\u6368\u4e94\u5165\u3084\u5207\u308a\u6368\u3066\u306e\u4e38\u3081\u8aa4\u5dee\u3092\u89e3\u6c7a<\/div>\n                    
\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n
BigDecimal\u3067\u6d88\u8cbb\u7a0e\u3092\u8a08\u7b97\u3059\u308b\u65b9\u6cd5<\/h2>\n
900\u5186\u306e\u5546\u54c1\u306b\u5bfe\u3059\u308b\u6d88\u8cbb\u7a0e\u3092\u542b\u3081\u305f\u4ee3\u91d1\u306f 900 \u00d7 1.08 = 972\u5186\u3068\u8a08\u7b97\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u3053\u308c\u3092Java\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u4e0a\u3067\u8a08\u7b97\u3092\u304a\u3053\u306a\u3046\u5834\u5408\u3001double<\/strong><\/span>\u578b\u3067\u7b97\u8853\u6f14\u7b97\u5b50\u3092\u4f7f\u3063\u3066\u8a08\u7b97<\/strong><\/span>\u3059\u308b\u65b9\u6cd5\u3068\u3001BigDecimal\u30af\u30e9\u30b9\u3092\u4f7f\u3046\u65b9\u6cd5<\/strong><\/span>\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
import java.math.BigDecimal;\r\n\r\npublic class Main {\r\n \r\n    public static void main(String[] args) {\r\n        \/\/ double\u578b\u3067\u7b97\u8853\u6f14\u7b97\u5b50\u3092\u4f7f\u3046\u5834\u5408\r\n        double price = 900;\r\n        double tax = 1.08;\r\n        double result = price * tax;\r\n        System.out.println(result);\r\n        \r\n        \/\/ BigDecimal\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u5f15\u6570\u306bdouble\u578b\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408\r\n        BigDecimal price1 = new BigDecimal(900);\r\n        BigDecimal tax1 = new BigDecimal(1.08);\r\n        BigDecimal result1 = price1.multiply(tax1);\r\n        System.out.println(result1);\r\n        \r\n        \/\/ BigDecimal\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u5f15\u6570\u306bString\u578b\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408\r\n        BigDecimal price2 = new BigDecimal(\"900\");\r\n        BigDecimal tax2 = new BigDecimal(\"1.08\");\r\n        BigDecimal result2 = price2.multiply(tax2);\r\n        System.out.println(result2);    \r\n    }\r\n\r\n}<\/pre>\n
\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n
972.0000000000001\r\n972.0000000000000639488462184090167284011840820312500\r\n972.00<\/pre>\n
double\u578b\u3067\u7b97\u8853\u6f14\u7b97\u5b50\u3092\u4f7f\u3063\u3066\u8a08\u7b97\u3057\u305f\u5834\u5408\u3068BigDecimal\u578b\u3067\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u5f15\u6570\u306bdouble\u578b\u3092\u4f7f\u3063\u305f\u5834\u5408\u306f\u8aa4\u5dee\u304c\u767a\u751f<\/strong><\/span>\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u308f\u305a\u304b\u306a\u5dee\u306b\u898b\u3048\u307e\u3059\u304c\u3001\u3053\u308c\u304c\u30b7\u30b9\u30c6\u30e0\u306e\u8981\u4ef6\u30671\u5186\u4ee5\u4e0b\u306f\u5207\u308a\u4e0a\u3052\u3068\u6c7a\u3081\u3066\u3044\u305f\u5834\u5408\u306f\u4ee3\u91d1\u304c973\u5186\u3068\u306a\u308a\u30011\u5186\u591a\u304f\u304a\u5ba2\u69d8\u3078\u8acb\u6c42\u3059\u308b\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u305d\u3057\u3066\u3001\u305d\u306e\u3053\u3068\u304c\u30b5\u30fc\u30d3\u30b9\u306e\u4fe1\u983c\u6027\u306e\u4f4e\u4e0b\u306b\u3064\u306a\u304c\u308a\u3001\u30aa\u30f3\u30e9\u30a4\u30f3\u30b7\u30e7\u30c3\u30d7\u306e\u5834\u5408\u3067\u306f\u9589\u5e97\u306b\u8ffd\u3044\u8fbc\u307e\u308c\u308b\u539f\u56e0\u306b\u306a\u308b\u53ef\u80fd\u6027\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n
BigDecimal<\/strong><\/span>\u578b\u3067\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u5f15\u6570\u306bString\u578b\u3092\u4f7f\u3063\u305f\u5834\u5408\u3001\u6b63\u78ba\u306a\u8a08\u7b97\u7d50\u679c<\/strong><\/span>\u304c\u5f97\u3089\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
BigDecimal\u306e\u4f7f\u3044\u65b9\u7dcf\u307e\u3068\u3081\u8a18\u4e8b\u306f\u3053\u3061\u3089<\/h2>\n
BigDecimal\u306e\u3055\u307e\u3056\u307e\u306a\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u306f\u3053\u3061\u3089\u3067\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u308b\u306e\u3067\u3001\u305c\u3072\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n            \n                
\n                
\n                    
\n                    \n                    <\/div>\n                    
\n                    
\u3010Java\u5165\u9580\u3011BigDecimal\u306e\u4f7f\u3044\u65b9\u7dcf\u307e\u3068\u3081(\u8db3\u3057\u7b97\u3001\u5f15\u304d\u7b97\u306a\u3069\u306e\u8a08\u7b97)<\/div>\n                    
\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n
\u6f14\u7b97\u5b50(\u7b97\u8853\u6f14\u7b97\u5b50)\u306b\u3064\u3044\u3066\u77e5\u308a\u305f\u3044\u65b9\u3078<\/h2>\n
\u7b97\u8853\u6f14\u7b97\u5b50\u306b\u3064\u3044\u3066\u306f\u3053\u3061\u3089\u3067\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u308b\u306e\u3067\u3001\u305c\u3072\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n            \n                
\n                
\n                    
\n                    \n                    <\/div>\n                    
\n                    
\u3010Java\u306e\u6f14\u7b97\u5b50\u3011\u7a2e\u985e\u3084\u4f7f\u3044\u65b9\u3092\u7db2\u7f85\u3057\u307e\u3057\u305f\uff01<\/div>\n                    
\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n
\u65e5\u4ed8\u306e\u8a08\u7b97\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u77e5\u308a\u305f\u3044\u65b9\u3078<\/h2>\n
\u307e\u305f\u3001\u65e5\u4ed8\u306e\u8a08\u7b97\u306b\u3064\u3044\u3066\u3082\u7b97\u8853\u6f14\u7b97\u5b50\u3092\u4f7f\u3046\u306e\u3067\u306f\u306a\u304f\u3001\u30e1\u30bd\u30c3\u30c9\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u65e5\u4ed8\u306e\u8a08\u7b97\u306b\u3064\u3044\u3066\u306f\u3053\u3061\u3089\u3067\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u308b\u306e\u3067\u3001\u305c\u3072\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n            \n                
\n                
\n                    
\n                    \n                    <\/div>\n                    
\n                    
\u3010Java\u5165\u9580\u3011Date\u30af\u30e9\u30b9\u3067\u73fe\u5728\u65e5\u6642\u306e\u53d6\u5f97\u3068\u52a0\u7b97\/\u6e1b\u7b97\u306a\u3069\u306e\u8a08\u7b97(add)<\/div>\n                    
\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n
\u307e\u3068\u3081<\/h2>\n
\u3053\u3053\u3067\u306f\u3001BigDecimal\u306b\u3064\u3044\u3066\u3001\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u304b\u3089\u6d88\u8cbb\u7a0e\u3092\u8a08\u7b97\u3059\u308b\u5b9f\u52d9\u7684\u306a\u5177\u4f53\u4f8b\u306b\u3064\u3044\u3066\u3082\u7d39\u4ecb\u3057\u307e\u3057\u305f\u3002<\/p>\n
\u5c0f\u6570\u70b9\u4ee5\u4e0b\u306e\u6570\u5b57\u3092\u6271\u3046\u30b7\u30b9\u30c6\u30e0\u306f\u6570\u591a\u304f\u5b58\u5728\u3057\u307e\u3059\u3002<\/p>\n
\u4e00\u898b\u3059\u308b\u3068\u8a08\u7b97\u7d50\u679c\u306b\u554f\u984c\u306a\u3044\u3088\u3046\u306b\u898b\u3048\u3066\u3082\u3001\u6b63\u78ba\u306a\u8a08\u7b97\u304c\u5fc5\u8981\u306a\u5834\u5408<\/strong><\/span>\u306b\u306fdouble\/float\u3067\u306f\u306a\u304f\u3001BigDecimal<\/strong><\/span>\u3092\u4f7f\u3046\u3088\u3046\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
\u3082\u3057\u3001BigDecimal\u306e\u4f7f\u3044\u65b9\u3092\u5fd8\u308c\u3066\u3057\u307e\u3063\u305f\u3089\u3001\u3053\u306e\u8a18\u4e8b\u3092\u601d\u3044\u51fa\u3057\u3066\u304f\u3060\u3055\u3044\u306d\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
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