{"id":11294,"date":"2024-03-15T06:48:05","date_gmt":"2024-03-14T21:48:05","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%82%ab%e3%83%ac%e3%83%b3%e3%83%80%e3%83%bc%e3%81%ae%e8%a9%b3%e7%b4%b0%e8%a7%a3%e8%aa%ac\/"},"modified":"2025-08-05T07:07:56","modified_gmt":"2025-08-04T22:07:56","slug":"java%e3%82%ab%e3%83%ac%e3%83%b3%e3%83%80%e3%83%bc%e3%81%ae%e8%a9%b3%e7%b4%b0%e8%a7%a3%e8%aa%ac","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%82%ab%e3%83%ac%e3%83%b3%e3%83%80%e3%83%bc%e3%81%ae%e8%a9%b3%e7%b4%b0%e8%a7%a3%e8%aa%ac\/","title":{"rendered":"Java\u30ab\u30ec\u30f3\u30c0\u30fc\u306e\u8a73\u7d30\u89e3\u8aac"},"content":{"rendered":"<p>Java Calendar\u306f\u65e5\u4ed8\u3068\u6642\u9593\u3092\u6271\u3046\u305f\u3081\u306eJava\u306e\u30af\u30e9\u30b9\u3067\u3059\u3002\u65e5\u4ed8\u3084\u6642\u9593\u60c5\u5831\u3092\u53d6\u5f97\u3001\u8a2d\u5b9a\u3001\u64cd\u4f5c\u3059\u308b\u305f\u3081\u306e\u591a\u304f\u306e\u30e1\u30bd\u30c3\u30c9\u304c\u63d0\u4f9b\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>Calendar\u30af\u30e9\u30b9\u306f\u62bd\u8c61\u30af\u30e9\u30b9\u3067\u3042\u308a\u3001\u76f4\u63a5\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5316\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u304c\u3001\u9759\u7684\u30e1\u30bd\u30c3\u30c9getInstance()\u3092\u547c\u3073\u51fa\u3059\u3053\u3068\u3067Calendar\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u53d6\u5f97\u3067\u304d\u307e\u3059\u3002\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u306f\u3001getInstance()\u30e1\u30bd\u30c3\u30c9\u306f\u73fe\u5728\u306e\u65e5\u4ed8\u3068\u6642\u523b\u3092\u8868\u3059Calendar\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n<p>\u30ab\u30ec\u30f3\u30c0\u30fc\u30af\u30e9\u30b9\u306b\u306f\u3001\u65e5\u4ed8\u3084\u6642\u9593\u3092\u6271\u3046\u305f\u3081\u306e\u591a\u304f\u306e\u30e1\u30bd\u30c3\u30c9\u304c\u63d0\u4f9b\u3055\u308c\u3066\u304a\u308a\u3001\u4ee5\u4e0b\u306f\u305d\u306e\u3046\u3061\u3044\u304f\u3064\u304b\u306e\u4e00\u822c\u7684\u306a\u30e1\u30bd\u30c3\u30c9\u3067\u3059\uff1a<\/p>\n<ol>\n<li>get()\u30e1\u30bd\u30c3\u30c9\uff1a\u7279\u5b9a\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u5024\uff08\u5e74\u3001\u6708\u3001\u65e5\u3001\u6642\u9593\u3001\u5206\u3001\u79d2\u306a\u3069\uff09\u3092\u53d6\u5f97\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/li>\n<li>set()\uff1a\u6307\u5b9a\u3055\u308c\u305f\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u5024\u3092\u8a2d\u5b9a\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u4f8b\uff1a\u5e74\u3001\u6708\u3001\u65e5\u3001\u6642\u3001\u5206\u3001\u79d2\u306a\u3069\u3002<\/li>\n<li>add()\u95a2\u6570\uff1a\u6307\u5b9a\u3055\u308c\u305f\u30d5\u30a3\u30fc\u30eb\u30c9\u306b\u6307\u5b9a\u3055\u308c\u305f\u5024\u3092\u8ffd\u52a0\u307e\u305f\u306f\u6e1b\u7b97\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u4f8b\u3048\u3070\u30011\u65e5\u8ffd\u52a0\u3059\u308b\u30011\u6642\u9593\u6e1b\u7b97\u3059\u308b\u306a\u3069\u304c\u3067\u304d\u307e\u3059\u3002<\/li>\n<li>roll()\u30e1\u30bd\u30c3\u30c8\u3099\u306f\u3001add()\u30e1\u30bd\u30c3\u30c8\u3099\u3068\u540c\u69d8\u3066\u3099\u3059\u304b\u3099\u3001\u7279\u5b9a\u306e\u30d5\u30a3\u30fc\u30eb\u30c8\u3099\u306b\u306e\u307f\u5897\u52a0\u307e\u305f\u306f\u6e1b\u5c11\u3092\u884c\u3044\u3001\u4ed6\u306e\u30d5\u30a3\u30fc\u30eb\u30c8\u3099\u306b\u306f\u5f71\u97ff\u3092\u4e0e\u3048\u307e\u305b\u3093\u3002<\/li>\n<li>getTime()\u30e1\u30bd\u30c3\u30c9\u306f\u3001Calendar\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u8868\u3059\u65e5\u4ed8\u3068\u6642\u523b\u3092\u8868\u3059Date\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u53d6\u5f97\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/li>\n<li>setTime()\u30e1\u30bd\u30c3\u30c9: Calendar\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u8868\u3059\u65e5\u4ed8\u3068\u6642\u9593\u306b\u3001Date\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u8a2d\u5b9a\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<p>\u4e0a\u8a18\u306e\u65b9\u6cd5\u4ee5\u5916\u306b\u3082\u3001Calendar\u30af\u30e9\u30b9\u306b\u306f\u9031\u306e\u6700\u521d\u306e\u65e5\u3092\u8a2d\u5b9a\u3057\u305f\u308a\u53d6\u5f97\u3057\u305f\u308a\u3059\u308b\u65b9\u6cd5\u3001\u7279\u5b9a\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u6700\u5927\u5024\u3084\u6700\u5c0f\u5024\u3092\u53d6\u5f97\u3059\u308b\u65b9\u6cd5\u306a\u3069\u3001\u4ed6\u306e\u3044\u304f\u3064\u304b\u306e\u30e1\u30bd\u30c3\u30c9\u304c\u63d0\u4f9b\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>Calendar\u306e\u6708\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u306f0\u304b\u3089\u59cb\u307e\u308a\u30010\u306f\u4e00\u6708\u3092\u8868\u3057\u300111\u306f\u5341\u4e8c\u6708\u3092\u8868\u3057\u307e\u3059\u3002\u307e\u305f\u3001Calendar\u306e\u66dc\u65e5\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u306f1\u304b\u3089\u59cb\u307e\u308a\u30011\u306f\u65e5\u66dc\u65e5\u3092\u8868\u3057\u30012\u306f\u6708\u66dc\u65e5\u3092\u8868\u3057\u307e\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b\u306f\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">import<\/span> java.util.Calendar;\r\n\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">CalendarExample<\/span> {\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">main<\/span><span class=\"hljs-params\">(String[] args)<\/span> {\r\n        <span class=\"hljs-comment\">\/\/ \u83b7\u53d6\u5f53\u524d\u65e5\u671f\u548c\u65f6\u95f4\u7684Calendar\u5bf9\u8c61<\/span>\r\n        <span class=\"hljs-type\">Calendar<\/span> <span class=\"hljs-variable\">calendar<\/span> <span class=\"hljs-operator\">=<\/span> Calendar.getInstance();\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u83b7\u53d6\u5e74\u4efd<\/span>\r\n        <span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">year<\/span> <span class=\"hljs-operator\">=<\/span> calendar.get(Calendar.YEAR);\r\n        System.out.println(<span class=\"hljs-string\">\"Year: \"<\/span> + year);\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u83b7\u53d6\u6708\u4efd\uff08\u6ce8\u610f\u6708\u4efd\u662f\u4ece0\u5f00\u59cb\u7684\uff09<\/span>\r\n        <span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">month<\/span> <span class=\"hljs-operator\">=<\/span> calendar.get(Calendar.MONTH) + <span class=\"hljs-number\">1<\/span>;\r\n        System.out.println(<span class=\"hljs-string\">\"Month: \"<\/span> + month);\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u83b7\u53d6\u65e5\u671f<\/span>\r\n        <span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">day<\/span> <span class=\"hljs-operator\">=<\/span> calendar.get(Calendar.DAY_OF_MONTH);\r\n        System.out.println(<span class=\"hljs-string\">\"Day: \"<\/span> + day);\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u8bbe\u7f6e\u65e5\u671f\u4e3a2022\u5e7410\u67081\u65e5<\/span>\r\n        calendar.set(Calendar.YEAR, <span class=\"hljs-number\">2022<\/span>);\r\n        calendar.set(Calendar.MONTH, <span class=\"hljs-number\">9<\/span>);\r\n        calendar.set(Calendar.DAY_OF_MONTH, <span class=\"hljs-number\">1<\/span>);\r\n        System.out.println(<span class=\"hljs-string\">\"New Date: \"<\/span> + calendar.getTime());\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u5728\u65e5\u671f\u4e0a\u589e\u52a0\u4e00\u5929<\/span>\r\n        calendar.add(Calendar.DAY_OF_MONTH, <span class=\"hljs-number\">1<\/span>);\r\n        System.out.println(<span class=\"hljs-string\">\"New Date: \"<\/span> + calendar.getTime());\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u83b7\u53d6\u4e00\u5468\u7684\u7b2c\u4e00\u5929\uff08\u9ed8\u8ba4\u4e3a\u661f\u671f\u65e5\uff09<\/span>\r\n        <span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">firstDayOfWeek<\/span> <span class=\"hljs-operator\">=<\/span> calendar.getFirstDayOfWeek();\r\n        System.out.println(<span class=\"hljs-string\">\"First Day of Week: \"<\/span> + firstDayOfWeek);\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u83b7\u53d6\u661f\u671f\u51e0\uff081\u8868\u793a\u661f\u671f\u65e5\uff0c2\u8868\u793a\u661f\u671f\u4e00\uff0c\u4ee5\u6b64\u7c7b\u63a8\uff09<\/span>\r\n        <span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">dayOfWeek<\/span> <span class=\"hljs-operator\">=<\/span> calendar.get(Calendar.DAY_OF_WEEK);\r\n        System.out.println(<span class=\"hljs-string\">\"Day of Week: \"<\/span> + dayOfWeek);\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u83b7\u53d6\u6307\u5b9a\u5b57\u6bb5\u7684\u6700\u5927\u503c\u548c\u6700\u5c0f\u503c<\/span>\r\n        <span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">maxDayOfMonth<\/span> <span class=\"hljs-operator\">=<\/span> calendar.getActualMaximum(Calendar.DAY_OF_MONTH);\r\n        <span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">minDayOfMonth<\/span> <span class=\"hljs-operator\">=<\/span> calendar.getActualMinimum(Calendar.DAY_OF_MONTH);\r\n        System.out.println(<span class=\"hljs-string\">\"Max Day of Month: \"<\/span> + maxDayOfMonth);\r\n        System.out.println(<span class=\"hljs-string\">\"Min Day of Month: \"<\/span> + minDayOfMonth);\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u7d50\u679c\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\uff1a<\/p>\n<pre class=\"post-pre\"><code>Year: 2021\r\nMonth: 10\r\nDay: 22\r\nNew Date: Sat Oct 01 00:00:00 CST 2022\r\nNew Date: Sun Oct 02 00:00:00 CST 2022\r\nFirst Day of Week: 1\r\nDay of Week: 1\r\nMax Day of Month: 31\r\nMin Day of Month: 1\r\n<\/code><\/pre>\n<p>\u4e0a\u8a18\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3001\u307e\u305aCalendar.getInstance\uff08\uff09\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u73fe\u5728\u306e\u65e5\u4ed8\u3068\u6642\u9593\u3092\u8868\u3059Calendar\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u53d6\u5f97\u3057\u307e\u3057\u305f\u3002\u6b21\u306b\u3001get\uff08\uff09\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u5e74\u3001\u6708\u3001\u65e5\u306a\u3069\u306e\u60c5\u5831\u3092\u53d6\u5f97\u3057\u3001set\uff08\uff09\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u65e5\u4ed8\u30922022\u5e7410\u67081\u65e5\u306b\u8a2d\u5b9a\u3057\u307e\u3057\u305f\u3002\u305d\u306e\u5f8c\u3001add\uff08\uff09\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u65e5\u4ed8\u30921\u65e5\u8ffd\u52a0\u3057\u3001getFirstDayOfWeek\uff08\uff09\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u9031\u306e\u6700\u521d\u306e\u65e5\u3092\u53d6\u5f97\u3057\u3001get\uff08\uff09\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u66dc\u65e5\u3092\u53d6\u5f97\u3057\u3001getActualMaximum\uff08\uff09\u304a\u3088\u3073getActualMinimum\uff08\uff09\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u6307\u5b9a\u3055\u308c\u305f\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u6700\u5927\u5024\u3068\u6700\u5c0f\u5024\u3092\u53d6\u5f97\u3057\u307e\u3057\u305f\u3002\u6700\u5f8c\u306b\u3001getTime\uff08\uff09\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066Calendar\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u5909\u63db\u3057\u307e\u3057\u305f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java Calendar\u306f\u65e5\u4ed8\u3068\u6642\u9593\u3092\u6271\u3046\u305f\u3081\u306eJava\u306e\u30af\u30e9\u30b9\u3067\u3059\u3002\u65e5\u4ed8\u3084\u6642\u9593\u60c5\u5831\u3092\u53d6\u5f97\u3001\u8a2d\u5b9a\u3001\u64cd\u4f5c\u3059\u308b\u305f\u3081\u306e\u591a\u304f\u306e\u30e1\u30bd\u30c3\u30c9\u304c\u63d0\u4f9b\u3055\u308c\u3066\u3044\u307e\u3059\u3002 Calendar\u30af\u30e9\u30b9\u306f\u62bd\u8c61\u30af\u30e9\u30b9\u3067\u3042\u308a\u3001\u76f4\u63a5\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5316\u3059\u308b\u3053\u3068\u306f [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-11294","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - 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