{"id":26254,"date":"2024-03-17T06:44:00","date_gmt":"2024-03-16T21:44:00","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%a7%e7%b0%a1%e5%8d%98%e3%81%aa%e3%82%ab%e3%83%ac%e3%83%b3%e3%83%80%e3%83%bc%e6%a9%9f%e8%83%bd%e3%82%92%e5%ae%9f%e8%a3%85%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95%e3%81%af%e4%bd%95%e3%81%a7\/"},"modified":"2024-03-22T13:25:50","modified_gmt":"2024-03-22T04:25:50","slug":"java%e3%81%a7%e7%b0%a1%e5%8d%98%e3%81%aa%e3%82%ab%e3%83%ac%e3%83%b3%e3%83%80%e3%83%bc%e6%a9%9f%e8%83%bd%e3%82%92%e5%ae%9f%e8%a3%85%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95%e3%81%af%e4%bd%95%e3%81%a7","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%a7%e7%b0%a1%e5%8d%98%e3%81%aa%e3%82%ab%e3%83%ac%e3%83%b3%e3%83%80%e3%83%bc%e6%a9%9f%e8%83%bd%e3%82%92%e5%ae%9f%e8%a3%85%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95%e3%81%af%e4%bd%95%e3%81%a7\/","title":{"rendered":"Java\u3067\u7c21\u5358\u306a\u30ab\u30ec\u30f3\u30c0\u30fc\u6a5f\u80fd\u3092\u5b9f\u88c5\u3059\u308b\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\uff1f"},"content":{"rendered":"<p>Java\u306b\u306f\u3001Calendar\u30af\u30e9\u30b9\u3068SimpleDateFormat\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u7c21\u5358\u306a\u30ab\u30ec\u30f3\u30c0\u30fc\u6a5f\u80fd\u3092\u5b9f\u88c5\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u6700\u521d\u306b\u3001Calendar\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3057\u3001\u65e5\u4ed8\u3092\u8868\u793a\u3057\u305f\u3044\u6708\u306e\u6700\u521d\u306e\u65e5\u306b\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u73fe\u5728\u306e\u6708\u306e\u30ab\u30ec\u30f3\u30c0\u30fc\u3092\u8868\u793a\u3059\u308b\u306b\u306f\u3001\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u4f7f\u7528\u3067\u304d\u307e\u3059\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-type\">Calendar<\/span> <span class=\"hljs-variable\">calendar<\/span> <span class=\"hljs-operator\">=<\/span> Calendar.getInstance();\r\ncalendar.set(Calendar.DAY_OF_MONTH, <span class=\"hljs-number\">1<\/span>);\r\n<\/code><\/pre>\n<p>\u305d\u306e\u5f8c\u3001\u6708\u306e\u6700\u521d\u306e\u65e5\u304c\u66dc\u65e5\u3092\u53d6\u5f97\u3057\u3001\u305d\u306e\u66dc\u65e5\u306b\u57fa\u3065\u3044\u3066\u30ab\u30ec\u30f3\u30c0\u30fc\u306e\u8868\u793a\u5f62\u5f0f\u3092\u6c7a\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u66dc\u65e5\u3068\u3057\u3066\u65e5\u66dc\u65e5\u3084\u6708\u66dc\u65e5\u306a\u3069\u3092\u9078\u629e\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u66dc\u65e5\u3092\u53d6\u5f97\u3059\u308b\u305f\u3081\u306b\u306f\u3001\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u4f7f\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">firstDayOfWeek<\/span> <span class=\"hljs-operator\">=<\/span> calendar.get(Calendar.DAY_OF_WEEK);\r\n<\/code><\/pre>\n<p>\u305d\u306e\u5f8c\u3001\u30ab\u30ec\u30f3\u30c0\u30fc\u306b\u8868\u793a\u3055\u308c\u308b\u884c\u6570\u3068\u5217\u6570\u3092\u6c7a\u5b9a\u3057\u3001\u65e5\u4ed8\u3092\u4fdd\u5b58\u3059\u308b\u305f\u3081\u306e2\u6b21\u5143\u914d\u5217\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u901a\u5e38\u3001\u30ab\u30ec\u30f3\u30c0\u30fc\u306e\u884c\u6570\u306f6\u3001\u5217\u6570\u306f7\u3067\u3059\u3002\u6b21\u306e\u30b3\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u30662\u6b21\u5143\u914d\u5217\u3092\u4f5c\u6210\u3067\u304d\u307e\u3059\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-type\">int<\/span>[][] calendarMatrix = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">int<\/span>[<span class=\"hljs-number\">6<\/span>][<span class=\"hljs-number\">7<\/span>];\r\n<\/code><\/pre>\n<p>\u6b21\u306b\u3001\u4e8c\u6b21\u5143\u914d\u5217\u3092\u57cb\u3081\u8fbc\u3093\u3067\u3001\u5404\u4f4d\u7f6e\u306b\u65e5\u4ed8\u3092\u8a18\u5165\u3059\u308b\u305f\u3081\u306b\u30eb\u30fc\u30d7\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002 \u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u3066\u5b9f\u884c\u3067\u304d\u307e\u3059\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">currentDay<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-number\">1<\/span>;\r\n<span class=\"hljs-keyword\">for<\/span> (<span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">i<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-number\">0<\/span>; i &lt; <span class=\"hljs-number\">6<\/span>; i++) {\r\n    <span class=\"hljs-keyword\">for<\/span> (<span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">j<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-number\">0<\/span>; j &lt; <span class=\"hljs-number\">7<\/span>; j++) {\r\n        <span class=\"hljs-keyword\">if<\/span> (i == <span class=\"hljs-number\">0<\/span> &amp;&amp; j &lt; firstDayOfWeek - <span class=\"hljs-number\">1<\/span>) {\r\n            <span class=\"hljs-comment\">\/\/ \u5982\u679c\u662f\u7b2c\u4e00\u884c\uff0c\u4e14\u4e0d\u5728\u7b2c\u4e00\u5929\u4e4b\u540e\uff0c\u5219\u586b\u51450<\/span>\r\n            calendarMatrix[i][j] = <span class=\"hljs-number\">0<\/span>;\r\n        } <span class=\"hljs-keyword\">else<\/span> <span class=\"hljs-keyword\">if<\/span> (currentDay &lt;= calendar.getActualMaximum(Calendar.DAY_OF_MONTH)) {\r\n            <span class=\"hljs-comment\">\/\/ \u586b\u5145\u65e5\u671f<\/span>\r\n            calendarMatrix[i][j] = currentDay;\r\n            currentDay++;\r\n        }\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u6700\u5f8c\u306b\u3001\u30ab\u30ec\u30f3\u30c0\u30fc\u3092\u8868\u793a\u3059\u308b\u305f\u3081\u306b\u3001\u4e8c\u6b21\u5143\u914d\u5217\u3092\u30eb\u30fc\u30d7\u3057\u3066\u5370\u5237\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<pre class=\"post-pre\"><code>System.out.println(<span class=\"hljs-string\">\"\u65e5 \u4e00 \u4e8c \u4e09 \u56db \u4e94 \u516d\"<\/span>);\r\n<span class=\"hljs-keyword\">for<\/span> (<span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">i<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-number\">0<\/span>; i &lt; <span class=\"hljs-number\">6<\/span>; i++) {\r\n    <span class=\"hljs-keyword\">for<\/span> (<span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">j<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-number\">0<\/span>; j &lt; <span class=\"hljs-number\">7<\/span>; j++) {\r\n        System.out.print(calendarMatrix[i][j]);\r\n        System.out.print(<span class=\"hljs-string\">\" \"<\/span>);\r\n    }\r\n    System.out.println();\r\n}\r\n<\/code><\/pre>\n<p>\u3053\u306e\u3088\u3046\u306b\u3059\u308b\u3068\u3001\u7c21\u5358\u306a\u30ab\u30ec\u30f3\u30c0\u30fc\u6a5f\u80fd\u3092\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u30b3\u30fc\u30c9\u3092\u4fee\u6b63\u304a\u3088\u3073\u62e1\u5f35\u3057\u3001\u4f8b\u3048\u3070\u5e74\u3068\u6708\u306e\u5165\u529b\u6a5f\u80fd\u3092\u8ffd\u52a0\u3057\u3066\u3001\u6307\u5b9a\u3057\u305f\u6708\u306e\u30ab\u30ec\u30f3\u30c0\u30fc\u3092\u8868\u793a\u3067\u304d\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u306b\u306f\u3001Calendar\u30af\u30e9\u30b9\u3068SimpleDateFormat\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u7c21\u5358\u306a\u30ab\u30ec\u30f3\u30c0\u30fc\u6a5f\u80fd\u3092\u5b9f\u88c5\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002 \u6700\u521d\u306b\u3001Calendar\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3057\u3001\u65e5\u4ed8\u3092\u8868\u793a\u3057\u305f\u3044\u6708\u306e\u6700\u521d\u306e\u65e5\u306b\u8a2d\u5b9a\u3059 [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-26254","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Java\u3067\u7c21\u5358\u306a\u30ab\u30ec\u30f3\u30c0\u30fc\u6a5f\u80fd\u3092\u5b9f\u88c5\u3059\u308b\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\uff1f - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/ja\/blog\/java\u3067\u7c21\u5358\u306a\u30ab\u30ec\u30f3\u30c0\u30fc\u6a5f\u80fd\u3092\u5b9f\u88c5\u3059\u308b\u65b9\u6cd5\u306f\u4f55\u3067\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java\u3067\u7c21\u5358\u306a\u30ab\u30ec\u30f3\u30c0\u30fc\u6a5f\u80fd\u3092\u5b9f\u88c5\u3059\u308b\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\uff1f\" \/>\n<meta property=\"og:description\" content=\"Java\u306b\u306f\u3001Calendar\u30af\u30e9\u30b9\u3068SimpleDateFormat\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u7c21\u5358\u306a\u30ab\u30ec\u30f3\u30c0\u30fc\u6a5f\u80fd\u3092\u5b9f\u88c5\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002 \u6700\u521d\u306b\u3001Calendar\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3057\u3001\u65e5\u4ed8\u3092\u8868\u793a\u3057\u305f\u3044\u6708\u306e\u6700\u521d\u306e\u65e5\u306b\u8a2d\u5b9a\u3059 [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/ja\/blog\/java\u3067\u7c21\u5358\u306a\u30ab\u30ec\u30f3\u30c0\u30fc\u6a5f\u80fd\u3092\u5b9f\u88c5\u3059\u308b\u65b9\u6cd5\u306f\u4f55\u3067\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2024-03-16T21:44:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-03-22T04:25:50+00:00\" \/>\n<meta name=\"author\" content=\"\u6d77\u6597, \u8475\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u57f7\u7b46\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"\u6d77\u6597, \u8475\" \/>\n<script type=\"application\/ld+json\" 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