{"id":21345,"date":"2017-04-14T22:27:17","date_gmt":"2017-04-14T13:27:17","guid":{"rendered":"http:\/\/www.sejuku.net\/blog\/?p=21345"},"modified":"2024-05-06T11:41:36","modified_gmt":"2024-05-06T02:41:36","slug":"%e3%80%90java%e5%85%a5%e9%96%80%e3%80%91bigdecimal%e3%81%a7%e5%9b%9b%e6%8d%a8%e4%ba%94%e5%85%a5%e3%82%84%e5%88%87%e3%82%8a%e6%8d%a8%e3%81%a6%e3%81%ae%e4%b8%b8%e3%82%81%e5%87%a6%e7%90%86%e3%82%92","status":"publish","type":"post","link":"https:\/\/www.sejuku.net\/blog\/21345","title":{"rendered":"\u3010\u89e3\u6c7aJava\u3011BigDecimal\u3067\u56db\u6368\u4e94\u5165\u3084\u5207\u308a\u6368\u3066\u306e\u4e38\u3081\u8aa4\u5dee\u3092\u89e3\u6c7a"},"content":{"rendered":"<p>\u3053\u3093\u306b\u3061\u306f\uff01\u30d5\u30ea\u30fc\u30e9\u30f3\u30b9\u306e\u9577\u91ce\u3067\u3059\u3002<\/p>\n<p>\u5272\u308a\u7b97\u3092\u884c\u3046\u5834\u5408\u3001\u8a08\u7b97\u7d50\u679c\u306e\u6570\u5024\u306e\u5c0f\u6570\u70b9\u4ee5\u4e0b\u3092\u56db\u6368\u4e94\u5165\u3057\u305f\u308a\u3001\u5207\u308a\u4e0a\u3052\u30fb\u5207\u308a\u6368\u3066\u306a\u3069\u306e\u7aef\u6570\u51e6\u7406\u3092\u3057\u305f\u3044\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3088\u306d\u3002<\/p>\n<p>\u305d\u3093\u306a\u6642\u306bJava\u3067\u306fBigDecimal\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001BigDecimal\u30af\u30e9\u30b9\u306b\u3064\u3044\u3066<\/p>\n<div class=\"box01\">\n<ul>\n<li><b>BigDecimal\u30af\u30e9\u30b9\u3068\u306f<\/b><\/li>\n<li><b>BigDecimal\u3067\u5c0f\u6570\u70b9\u4ee5\u4e0b\u3092\u8aa4\u5dee\u306a\u304f\u6271\u3046\u65b9\u6cd5<\/b><\/li>\n<li><b>setScale\u30e1\u30bd\u30c3\u30c9\u3067\u4e38\u3081\u51e6\u7406\u3092\u3059\u308b\u65b9\u6cd5<\/b><\/li>\n<li><b>divide\u30e1\u30bd\u30c3\u30c9\u3067\u5272\u308a\u7b97\u306e\u56db\u6368\u4e94\u5165\u3092\u3059\u308b\u65b9\u6cd5<\/b><\/li>\n<li><b>\u5c0f\u6570\u70b9\u4ee5\u4e0b\u306e\u6841\u6570\u3092\u6307\u5b9a\u3059\u308b\u65b9\u6cd5<\/b><\/li>\n<li><b>\u30de\u30a4\u30ca\u30b9\u306e\u5024\u306e\u5834\u5408<\/b><\/li>\n<\/ul>\n<\/div>\n<p>\u306a\u3069\u306e\u57fa\u672c\u7684\u306a\u5185\u5bb9\u304b\u3089\u3001\u5177\u4f53\u7684\u306a\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u3082\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<p>\u4eca\u56de\u306f\u305d\u3093\u306a\u7aef\u6570\u306e\u4e38\u3081\u51e6\u7406\u306b\u3064\u3044\u3066\u3001\u3055\u307e\u3056\u307e\u306a\u65b9\u6cd5\u3092\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3057\u307e\u3059\uff01<\/p>\n<p>\u306a\u304a\u3001Java\u306e\u8a18\u4e8b\u306b\u3064\u3044\u3066\u306f\u3001<a href=\"https:\/\/www.sejuku.net\/blog\/148098\" target=\"_blank\" rel=\"noopener\">\u3053\u3061\u3089<\/a>\u306b\u307e\u3068\u3081\u3066\u3044\u307e\u3059\u3002<\/p>\n<h2>BigDecimal\u30af\u30e9\u30b9\u3068\u306f<\/h2>\n<p>BigDecimal\u306f\u5c0f\u6570\u70b9\u4ee5\u4e0b\u306e\u5024\u306b\u8aa4\u5dee\u304c\u51fa\u306a\u3044\u3088\u3046\u306b\u6b63\u78ba\u306b\u8a08\u7b97\u3059\u308b\u305f\u3081\u306b\u4f7f\u3044\u307e\u3059\u3002<\/p>\n<p>\u307e\u305f\u3001\u5c0f\u6570\u70b9\u4ee5\u4e0b\u3092\u56db\u6368\u4e94\u5165\u3057\u305f\u308a\u3001\u5207\u308a\u4e0a\u3052\u30fb\u5207\u308a\u6368\u3066\u306a\u3069\u306e\u7aef\u6570\u51e6\u7406\u3092\u884c\u3044\u305f\u3044\u5834\u5408\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n<p>\u305d\u308c\u3067\u306fBigDecimal\u3092\u4f7f\u3063\u3066\u5c0f\u6570\u70b9\u4ee5\u4e0b\u3092\u8aa4\u5dee\u306a\u304f\u6271\u3046\u65b9\u6cd5\u3084\u3001\u5c0f\u6570\u70b9\u4ee5\u4e0b\u306e\u7aef\u6570\u51e6\u7406\u3092\u884c\u3046\u65b9\u6cd5\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u307f\u3066\u3044\u304d\u307e\u3057\u3087\u3046\uff01<\/p>\n<h2>BigDecimal\u3067\u5c0f\u6570\u70b9\u4ee5\u4e0b\u3092\u8aa4\u5dee\u306a\u304f\u6271\u3046\u65b9\u6cd5<\/h2>\n<p>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<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">import java.math.BigDecimal;<\/pre>\n<p>\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<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">String val = \u201c123.456789\u201d;\r\nBigDecimal bd = new BigDecimal(val);<\/pre>\n<h3>\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u3067\u306f\u306a\u304f\u6587\u5b57\u5217\u3067\u6307\u5b9a<\/h3>\n<p>BigDecimal\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u5f15\u6570\u306b\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u578b\u3068\u6587\u5b57\u5217\u578b\u3069\u3061\u3089\u3082\u6307\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\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\u3059\u308b\u306e\u3067\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n<p>\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\u3057\u307e\u3057\u3087\u3046\uff01<\/p>\n<p>\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u78ba\u8a8d\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"lang:java decode:true \">import java.math.BigDecimal;\r\n \r\npublic class Main {\r\n \r\n    public static void main(String[] args) {\r\n        BigDecimal bd1 = new BigDecimal(0.6); \/\/ \u5f15\u6570\u306bdouble\u578b\u3067\u6307\u5b9a\r\n        BigDecimal bd2 = new BigDecimal(\"0.6\"); \/\/ \u5f15\u6570\u306bString\u578b\u3067\u6307\u5b9a\r\n        \r\n        System.out.println(bd1);\r\n        System.out.println(bd2);\r\n    }\r\n \r\n}<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">0.59999999999999997779553950749686919152736663818359375\r\n0.6<\/pre>\n<p>\u3053\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u306fBigDecimal\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u5f15\u6570\u3092double\u578b\u3068String\u578b\u3067\u6307\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>1\u3064\u76ee\u306fdouble\u578b\u3067\u6307\u5b9a\u3057\u3066\u3044\u307e\u3059\u304c\u3001\u5b9f\u884c\u7d50\u679c\u3092\u307f\u308b\u3068\u8aa4\u5dee\u304c\u767a\u751f\u3057\u3066\u3044\u308b\u306e\u304c\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n<p>2\u3064\u76ee\u306fString\u578b\u3067\u6307\u5b9a\u3057\u3066\u3044\u307e\u3059\u304c\u3001\u6b63\u78ba\u306a\u5024\u3092\u8868\u793a\u3067\u304d\u3066\u3044\u307e\u3059\u3002<\/p>\n<h3>\u56db\u5247\u6f14\u7b97\u7528\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u305f\u8a08\u7b97<\/h3>\n<p>BigDecimal\u30af\u30e9\u30b9\u3067\u4f7f\u7528\u3059\u308b\u56db\u5247\u6f14\u7b97\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u4e0b\u8a18\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n\n<table id=\"tablepress-92\" class=\"tablepress tablepress-id-92\">\n<thead>\n<tr class=\"row-1\">\n\t<th class=\"column-1\">\u30e1\u30bd\u30c3\u30c9<\/th><th class=\"column-2\">\u8aac\u660e<\/th>\n<\/tr>\n<\/thead>\n<tbody class=\"row-striping row-hover\">\n<tr class=\"row-2\">\n\t<td class=\"column-1\">add()<\/td><td class=\"column-2\">\u8db3\u3057\u7b97<\/td>\n<\/tr>\n<tr class=\"row-3\">\n\t<td class=\"column-1\">subtract()<\/td><td class=\"column-2\">\u5f15\u304d\u7b97<\/td>\n<\/tr>\n<tr class=\"row-4\">\n\t<td class=\"column-1\">multiply()<\/td><td class=\"column-2\">\u639b\u3051\u7b97<\/td>\n<\/tr>\n<tr class=\"row-5\">\n\t<td class=\"column-1\">divide()<\/td><td class=\"column-2\">\u5272\u308a\u7b97<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<!-- #tablepress-92 from cache -->\n<p>\u4e00\u822c\u7684\u306a\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u578b\u306e\u56db\u5247\u6f14\u7b97\u306e\u7d50\u679c\u3068BigDecimal\u30af\u30e9\u30b9\u306e\u56db\u5247\u6f14\u7b97\u7528\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u305f\u8a08\u7b97\u7d50\u679c\u3092\u6bd4\u3079\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"lang:java decode:true \">import java.math.BigDecimal;\r\n \r\npublic class Main {\r\n    \r\n    public static void main (String[] args) {\r\n        \/\/ double\u578b\u306e\u56db\u5247\u6f14\u7b97\r\n        System.out.println(2.0 - 6 * 0.3); \r\n        \r\n        \/\/ BigDecimal\u30af\u30e9\u30b9\u3067\u306e\u56db\u5247\u6f14\u7b97\r\n        BigDecimal bd1 = new BigDecimal(2.0);\r\n        BigDecimal bd2 = new BigDecimal(-6);\r\n        BigDecimal bd3 = new BigDecimal(\"0.3\");\r\n        BigDecimal result = bd1.add(bd2.multiply(bd3));    \r\n        System.out.println(result.toString());\r\n    }\r\n    \r\n}<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">0.20000000000000018\r\n0.2<\/pre>\n<p>\u3053\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u306f\u4e00\u822c\u7684\u306adouble\u578b\u306e\u56db\u5247\u6f14\u7b97\u3068BigDecimal\u30af\u30e9\u30b9\u3092\u4f7f\u3063\u305f\u56db\u5247\u6f14\u7b97\u3092\u884c\u3044\u3001\u540c\u3058\u5f0f\u3067\u540c\u3058\u8a08\u7b97\u7d50\u679c\u304c\u5f97\u3089\u308c\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u3057\u304b\u3057\u3001\u4e00\u822c\u7684\u306adouble\u578b\u306e\u56db\u5247\u6f14\u7b97\u306e\u7d50\u679c\u306f0.2\u3068\u306f\u5c11\u3057\u9055\u3063\u3066\u8aa4\u5dee\u304c\u751f\u3058\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u306b\u5bfe\u3057\u3066<b>BigDecimal\u30af\u30e9\u30b9\u3092\u4f7f\u3063\u305f\u56db\u5247\u6f14\u7b97\u306e\u7d50\u679c\u306f\u610f\u56f3\u901a\u308a\u306e\u7d50\u679c<\/b>\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<h2>setScale\u30e1\u30bd\u30c3\u30c9\u3067\u4e38\u3081\u51e6\u7406\u3092\u3059\u308b\u65b9\u6cd5<\/h2>\n<p>\u305d\u308c\u3067\u306f\u3001\u5b9f\u969b\u306b\u7aef\u6570\u306e\u4e38\u3081\u51e6\u7406\u3092\u3059\u308b\u65b9\u6cd5\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>BigDecimal\u30af\u30e9\u30b9\u306esetScale\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n<p>setScale\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u3067\u51e6\u7406\u3092\u884c\u3046\u6841\u6570\u3068\u4e38\u3081\u51e6\u7406\u306e\u65b9\u6cd5\u306e\u6307\u5b9a\u3092\u884c\u3044\u307e\u3059\u3002<\/p>\n\n<table id=\"tablepress-93\" class=\"tablepress tablepress-id-93 tbody-has-connected-cells\">\n<thead>\n<tr class=\"row-1\">\n\t<th class=\"column-1\">\u30e1\u30bd\u30c3\u30c9<\/th><th colspan=\"2\" class=\"column-2\">\u7b2c\uff11\u5f15\u6570\uff1a\u6841\u6570\u3092\u6307\u5b9a<\/th><th colspan=\"2\" class=\"column-4\">\u7b2c\uff12\u5f15\u6570\uff1a\u4e38\u76ee\u51e6\u7406\u306e\u65b9\u6cd5\u3092\u6307\u5b9a<\/th>\n<\/tr>\n<\/thead>\n<tbody class=\"row-striping row-hover\">\n<tr class=\"row-2\">\n\t<td class=\"column-1\"><\/td><td class=\"column-2\">\u4f8b<\/td><td class=\"column-3\">\u8aac\u660e<\/td><td class=\"column-4\">\u4f8b<\/td><td class=\"column-5\">\u8aac\u660e<\/td>\n<\/tr>\n<tr class=\"row-3\">\n\t<td rowspan=\"3\" class=\"column-1\">setScale<\/td><td class=\"column-2\">0<\/td><td class=\"column-3\">\u5c0f\u6570\u7b2c1\u4f4d<\/td><td class=\"column-4\">BigDecimal.ROUND_HALF_UP<\/td><td class=\"column-5\">\u56db\u6368\u4e94\u5165<\/td>\n<\/tr>\n<tr class=\"row-4\">\n\t<td class=\"column-2\">1<\/td><td class=\"column-3\">\u5c0f\u6570\u7b2c2\u4f4d<\/td><td class=\"column-4\">BigDecimal.ROUND_DOWN<\/td><td class=\"column-5\">\u5207\u308a\u6368\u3066<\/td>\n<\/tr>\n<tr class=\"row-5\">\n\t<td class=\"column-2\">2<\/td><td class=\"column-3\">\u5c0f\u6570\u7b2c3\u4f4d<\/td><td class=\"column-4\">BigDecimal.ROUND_UP<\/td><td class=\"column-5\">\u5207\u308a\u4e0a\u3052<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<!-- #tablepress-93 from cache -->\n<h3>\u6841\u6570\u3092\u6307\u5b9a\u3057\u3066\u56db\u6368\u4e94\u5165\u3092\u3059\u308b\u65b9\u6cd5<\/h3>\n<p>\u305d\u308c\u3067\u306f\u56db\u6368\u4e94\u5165\u306e\u51e6\u7406\u3092\u3059\u308b\u5834\u5408\u306e\u5b9f\u969b\u306e\u30b3\u30fc\u30c9\u3068\u305d\u306e\u51e6\u7406\u7d50\u679c\u3092\u307f\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"lang:java decode:true \">import java.math.BigDecimal;\r\n \r\npublic class Main {\r\n \r\n    public static void main(String[] args) {\r\n        \/\/\u5143\u30c7\u30fc\u30bf\r\n        String val = \"123.456789\";\r\n        \/\/\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u4f5c\u6210\r\n        BigDecimal bd = new BigDecimal(val);\r\n        \r\n        \/\/\u5c0f\u6570\u7b2c1\u4f4d\u3067\u56db\u6368\u4e94\u5165\r\n        BigDecimal bd1 = bd.setScale(0, BigDecimal.ROUND_HALF_UP);\r\n        \/\/\u5c0f\u6570\u7b2c2\u4f4d\u3067\u56db\u6368\u4e94\u5165\r\n        BigDecimal bd2 = bd.setScale(1, BigDecimal.ROUND_HALF_UP);\r\n        \r\n        \/\/\u5b9f\u884c\u7d50\u679c\r\n        System.out.println(\"\u5c0f\u6570\u7b2c1\u4f4d\u3067\u56db\u6368\u4e94\u5165:\" + bd1);\r\n        System.out.println(\"\u5c0f\u6570\u7b2c2\u4f4d\u3067\u56db\u6368\u4e94\u5165:\" + bd2);\r\n    }\r\n \r\n}<\/pre>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">\u5c0f\u6570\u7b2c1\u4f4d\u3067\u56db\u6368\u4e94\u5165:123\r\n\u5c0f\u6570\u7b2c2\u4f4d\u3067\u56db\u6368\u4e94\u5165:123.5<\/pre>\n<h3>\u30de\u30a4\u30ca\u30b9\u5024\u306e\u56db\u6368\u4e94\u5165<\/h3>\n<p>\u30de\u30a4\u30ca\u30b9\u306e\u5024\u3092\u56db\u6368\u4e94\u5165\u3057\u305f\u3044\u5834\u5408\u3082\u3042\u308a\u307e\u3059\u3088\u306d\u3002\u7d50\u679c\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"lang:java decode:true \">import java.math.BigDecimal;\r\n \r\npublic class Main {\r\n \r\n    public static void main(String[] args) {\r\n        \/\/\u5143\u30c7\u30fc\u30bf\r\n        String val = \"-123.456789\";\r\n        \/\/\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u4f5c\u6210\r\n        BigDecimal bd = new BigDecimal(val);\r\n        \r\n        \/\/\u5c0f\u6570\u7b2c1\u4f4d\u3067\u56db\u6368\u4e94\u5165\r\n        BigDecimal bd1 = bd.setScale(0, BigDecimal.ROUND_HALF_UP);\r\n        \/\/\u5c0f\u6570\u7b2c2\u4f4d\u3067\u56db\u6368\u4e94\u5165\r\n        BigDecimal bd2 = bd.setScale(1, BigDecimal.ROUND_HALF_UP);\r\n        \r\n        \/\/\u5b9f\u884c\u7d50\u679c\r\n        System.out.println(\"\u5c0f\u6570\u7b2c1\u4f4d\u3067\u56db\u6368\u4e94\u5165:\" + bd1);\r\n        System.out.println(\"\u5c0f\u6570\u7b2c2\u4f4d\u3067\u56db\u6368\u4e94\u5165:\" + bd2);\r\n    }\r\n \r\n}<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">\u5c0f\u6570\u7b2c2\u4f4d\u3067\u56db\u6368\u4e94\u5165:-123\r\n\u5c0f\u6570\u7b2c2\u4f4d\u3067\u56db\u6368\u4e94\u5165:-123.5<\/pre>\n<h3>\u5207\u308a\u6368\u3066\u3001\u5207\u308a\u4e0a\u3052\u3092\u3059\u308b\u65b9\u6cd5<\/h3>\n<p>\u6b21\u306b\u3001\u5207\u308a\u6368\u3066\u3001\u5207\u308a\u4e0a\u3052\u306e\u51e6\u7406\u3092\u3059\u308b\u5834\u5408\u306e\u5b9f\u969b\u306e\u30b3\u30fc\u30c9\u3068\u305d\u306e\u51e6\u7406\u7d50\u679c\u3092\u307f\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"lang:java decode:true \">import java.math.BigDecimal;\r\n \r\npublic class Main {\r\n \r\n    public static void main(String[] args) {\r\n        \/\/\u5143\u30c7\u30fc\u30bf\r\n        String val = \"123.456789\";\r\n        \/\/\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u4f5c\u6210\r\n        BigDecimal bd = new BigDecimal(val);\r\n        \r\n        \/\/\u5c0f\u6570\u7b2c1\u4f4d\u3067\u5207\u308a\u6368\u3066\r\n        BigDecimal bd1 = bd.setScale(0, BigDecimal.ROUND_DOWN);\r\n        \/\/\u5c0f\u6570\u7b2c2\u4f4d\u3067\u5207\u308a\u6368\u3066\r\n        BigDecimal bd2 = bd.setScale(1, BigDecimal.ROUND_DOWN);\r\n        \r\n        \/\/\u5c0f\u6570\u7b2c1\u4f4d\u3067\u5207\u308a\u4e0a\u3052\r\n        BigDecimal bd3 = bd.setScale(0, BigDecimal.ROUND_UP);\r\n        \/\/\u5c0f\u6570\u7b2c2\u4f4d\u3067\u5207\u308a\u4e0a\u3052\r\n        BigDecimal bd4 = bd.setScale(1, BigDecimal.ROUND_UP);\r\n        \r\n        \/\/\u7d50\u679c\u8868\u793a\r\n        System.out.println(\"\u5c0f\u6570\u7b2c1\u4f4d\u3067\u5207\u6368\u3066:\" + bd1);\r\n        System.out.println(\"\u5c0f\u6570\u7b2c2\u4f4d\u3067\u5207\u6368\u3066:\" + bd2);\r\n        \r\n        System.out.println(\"\u5c0f\u6570\u7b2c1\u4f4d\u3067\u5207\u4e0a\u3052:\" + bd3);\r\n        System.out.println(\"\u5c0f\u6570\u7b2c2\u4f4d\u3067\u5207\u4e0a\u3052:\" + bd4);\r\n    }\r\n \r\n}<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">\u5c0f\u6570\u7b2c1\u4f4d\u3067\u5207\u6368\u3066:123\r\n\u5c0f\u6570\u7b2c2\u4f4d\u3067\u5207\u6368\u3066:123.4\r\n\u5c0f\u6570\u7b2c1\u4f4d\u3067\u5207\u4e0a\u3052:124\r\n\u5c0f\u6570\u7b2c2\u4f4d\u3067\u5207\u4e0a\u3052:123.5<\/pre>\n<h3>\u30de\u30a4\u30ca\u30b9\u5024\u306e\u5207\u308a\u6368\u3066\u3001\u5207\u308a\u4e0a\u3052<\/h3>\n<p>\u3053\u3061\u3089\u3082\u30de\u30a4\u30ca\u30b9\u306e\u5024\u3092\u51e6\u7406\u3057\u305f\u3044\u5834\u5408\u3082\u3042\u308a\u307e\u3059\u3088\u306d\u3002\u7d50\u679c\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"lang:java decode:true \">import java.math.BigDecimal;\r\n \r\npublic class Main {\r\n \r\n    public static void main(String[] args) {\r\n        \/\/\u5143\u30c7\u30fc\u30bf\r\n        String val = \"-123.456789\";\r\n        \/\/\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u4f5c\u6210\r\n        BigDecimal bd = new BigDecimal(val);\r\n        \r\n        \/\/\u5c0f\u6570\u7b2c1\u4f4d\u3067\u5207\u308a\u6368\u3066\r\n        BigDecimal bd1 = bd.setScale(0, BigDecimal.ROUND_DOWN);\r\n        \/\/\u5c0f\u6570\u7b2c2\u4f4d\u3067\u5207\u308a\u6368\u3066\r\n        BigDecimal bd2 = bd.setScale(1, BigDecimal.ROUND_DOWN);\r\n    \r\n        \/\/\u5c0f\u6570\u7b2c1\u4f4d\u3067\u5207\u308a\u4e0a\u3052\r\n        BigDecimal bd3 = bd.setScale(0, BigDecimal.ROUND_UP);\r\n        \/\/\u5c0f\u6570\u7b2c2\u4f4d\u3067\u5207\u308a\u4e0a\u3052\r\n        BigDecimal bd4 = bd.setScale(1, BigDecimal.ROUND_UP);\r\n     \r\n        \/\/\u7d50\u679c\u8868\u793a\r\n        System.out.println(\"\u5c0f\u6570\u7b2c1\u4f4d\u3067\u5207\u6368\u3066:\" + bd1);\r\n        System.out.println(\"\u5c0f\u6570\u7b2c2\u4f4d\u3067\u5207\u6368\u3066:\" + bd2);\r\n    \r\n        System.out.println(\"\u5c0f\u6570\u7b2c1\u4f4d\u3067\u5207\u4e0a\u3052:\" + bd3);\r\n        System.out.println(\"\u5c0f\u6570\u7b2c2\u4f4d\u3067\u5207\u4e0a\u3052:\" + bd4);\r\n    }\r\n \r\n}<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">\u5c0f\u6570\u7b2c1\u4f4d\u3067\u5207\u6368\u3066:-123\r\n\u5c0f\u6570\u7b2c2\u4f4d\u3067\u5207\u6368\u3066:-123.4\r\n\u5c0f\u6570\u7b2c1\u4f4d\u3067\u5207\u4e0a\u3052:-124\r\n\u5c0f\u6570\u7b2c2\u4f4d\u3067\u5207\u4e0a\u3052:-123.5<\/pre>\n<h2>divide\u30e1\u30bd\u30c3\u30c9\u3067\u5272\u308a\u7b97\u306e\u56db\u6368\u4e94\u5165\u3092\u3059\u308b\u65b9\u6cd5<\/h2>\n<p>BigDecimal\u30af\u30e9\u30b9\u306b\u306f\u3001\u56db\u5247\u6f14\u7b97\u7528\u306e\u30e1\u30bd\u30c3\u30c9\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u307e\u3057\u305f\u3002<\/p>\n\n<table id=\"tablepress-92-no-2\" class=\"tablepress tablepress-id-92\">\n<thead>\n<tr class=\"row-1\">\n\t<th class=\"column-1\">\u30e1\u30bd\u30c3\u30c9<\/th><th class=\"column-2\">\u8aac\u660e<\/th>\n<\/tr>\n<\/thead>\n<tbody class=\"row-striping row-hover\">\n<tr class=\"row-2\">\n\t<td class=\"column-1\">add()<\/td><td class=\"column-2\">\u8db3\u3057\u7b97<\/td>\n<\/tr>\n<tr class=\"row-3\">\n\t<td class=\"column-1\">subtract()<\/td><td class=\"column-2\">\u5f15\u304d\u7b97<\/td>\n<\/tr>\n<tr class=\"row-4\">\n\t<td class=\"column-1\">multiply()<\/td><td class=\"column-2\">\u639b\u3051\u7b97<\/td>\n<\/tr>\n<tr class=\"row-5\">\n\t<td class=\"column-1\">divide()<\/td><td class=\"column-2\">\u5272\u308a\u7b97<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<!-- #tablepress-92-no-2 from cache -->\n<p>\u5272\u308a\u7b97\u3067\u56db\u6368\u4e94\u5165\u3092\u3059\u308b\u5834\u5408\u306f\u30012\u756a\u76ee\u306e\u5f15\u6570\u3067\u6841\u6570\u306e\u6307\u5b9a\u3092\u30013\u756a\u76ee\u306e\u5f15\u6570\u3067\u4e38\u3081\u65b9\u6cd5\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n<p>\u4e38\u3081\u65b9\u6cd5\u306fsetScale\u30e1\u30bd\u30c3\u30c9\u3068\u540c\u3058\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u305d\u308c\u3067\u306f\u4f8b\u3092\u307f\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"lang:java decode:true \">import java.math.BigDecimal;\r\n \r\npublic class Main {\r\n \r\n    public static void main(String[] args) {\r\n        \/\/ \u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u751f\u6210\r\n        BigDecimal bd1 = new BigDecimal(\"5.0\");\r\n        BigDecimal bd2 = new BigDecimal(\"10.0\");\r\n        BigDecimal bd3 = new BigDecimal(\"3.0\");\r\n \r\n        \/\/ \u8db3\u3057\u7b97 ( 5.0 + 10.0 )\r\n        BigDecimal add = bd1.add(bd2);\r\n \r\n        \/\/ \u5f15\u304d\u7b97 ( 5.0 - 10.0\uff09\r\n        BigDecimal sub = bd1.subtract(bd2);\r\n \r\n        \/\/ \u639b\u3051\u7b97 ( 5.0 * 3.0 )\r\n        BigDecimal mul = bd1.multiply(bd3);\r\n \r\n        \/\/ \u5272\u308a\u7b97 ( 10.0 \/ 3.0 \u5c11\u6570\u7b2c\uff13\u4f4d\u3067\u56db\u6368\u4e94\u5165)\r\n        BigDecimal div = bd2.divide(bd3, 2, BigDecimal.ROUND_HALF_UP);\r\n \r\n        System.out.println(\"\u8db3\u3057\u7b97: \" + add);\r\n        System.out.println(\"\u5f15\u304d\u7b97: \" + sub);\r\n        System.out.println(\"\u639b\u3051\u7b97: \" + mul);\r\n        System.out.println(\"\u5272\u308a\u7b97: \" + div);\r\n    }\r\n \r\n}<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">\u8db3\u3057\u7b97: 15.0\r\n\u5f15\u304d\u7b97: -5.0\r\n\u639b\u3051\u7b97: 15.00\r\n\u5272\u308a\u7b97: 3.33<\/pre>\n<p>\u3053\u3053\u3067\u3001\u6ce8\u610f\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u5272\u308a\u7b97\u306e\u5834\u5408\u3001\u4e0b\u8a18\u306e\u3088\u3046\u306b\u4e38\u3081\u51e6\u7406\u3092\u8a18\u8ff0\u305b\u305a\u306b\u5272\u308a\u5207\u308c\u306a\u3044\u8a08\u7b97\u3092\u3059\u308b\u3068\u7121\u9650\u5c0f\u6570\u3068\u306a\u308a\u3001ArithmeticException\u306e\u4f8b\u5916\u304c\u767a\u751f\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">BigDecimal div = bd2.divide(bd3);<\/pre>\n<h2>compareTo\u306b\u3088\u308bBigDecimal\u540c\u58eb\u306e\u6bd4\u8f03<\/h2>\n<p>BigDecimal\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u6bd4\u8f03\u3059\u308b\u5834\u5408\u306f\u3001compareTo\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3044\u307e\u3059\u3002<\/p>\n<p>compareTo\u30e1\u30bd\u30c3\u30c9\u3067BigDecimal\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u6bd4\u8f03\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u306f\u3053\u3061\u3089\u3067\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u306e\u3067\u3001\u53c2\u8003\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u306d\uff01<\/p>\n            <a href=\"https:\/\/www.sejuku.net\/blog\/21589\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/04\/image-110-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010Java\u5165\u9580\u3011BigDecimal\u306e\u5927\u5c0f\u3092compareTo\u3067\u6bd4\u8f03\u3059\u308b\u65b9\u6cd5<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n<h2>BigDecimal\u3067\u6b63\u78ba\u306b\u8a08\u7b97\u3059\u308b\u65b9\u6cd5\u7dcf\u307e\u3068\u3081<\/h2>\n<p>BigDeciaml\u30af\u30e9\u30b9\u3092\u4f7f\u3063\u3066\u8aa4\u5dee\u306a\u304f\u6b63\u78ba\u306b\u8a08\u7b97\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u306f\u3001\u6b21\u306e\u8a18\u4e8b\u306b\u307e\u3068\u3081\u3066\u3044\u308b\u306e\u3067\u305c\u3072\u78ba\u8a8d\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u306d\uff01<\/p>\n            <a href=\"https:\/\/www.sejuku.net\/blog\/25564\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/10\/java-bigdecimal-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\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                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            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