{"id":11949,"date":"2024-03-15T10:40:10","date_gmt":"2024-03-15T01:40:10","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%ae%e3%82%b3%e3%83%ac%e3%82%af%e3%82%b7%e3%83%a7%e3%83%b3%e3%82%af%e3%83%a9%e3%82%b9%e3%81%ae%e4%bd%bf%e7%94%a8%e6%96%b9%e6%b3%95%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99%e3%81%8b%ef%bc%9f\/"},"modified":"2025-08-05T10:11:21","modified_gmt":"2025-08-05T01:11:21","slug":"java%e3%81%ae%e3%82%b3%e3%83%ac%e3%82%af%e3%82%b7%e3%83%a7%e3%83%b3%e3%82%af%e3%83%a9%e3%82%b9%e3%81%ae%e4%bd%bf%e7%94%a8%e6%96%b9%e6%b3%95%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99%e3%81%8b%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%ae%e3%82%b3%e3%83%ac%e3%82%af%e3%82%b7%e3%83%a7%e3%83%b3%e3%82%af%e3%83%a9%e3%82%b9%e3%81%ae%e4%bd%bf%e7%94%a8%e6%96%b9%e6%b3%95%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99%e3%81%8b%ef%bc%9f\/","title":{"rendered":"Java\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u30af\u30e9\u30b9\u306e\u4f7f\u3044\u65b9\u306f\u4f55\u3067\u3059\u304b\uff1f"},"content":{"rendered":"<p>Java\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u30af\u30e9\u30b9\u306e\u4f7f\u7528\u65b9\u6cd5\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\uff1a<\/p>\n<ol>\n<li>Java\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3059\u308b\u524d\u306b\u3001\u5bfe\u5fdc\u3059\u308b\u30d1\u30c3\u30b1\u30fc\u30b8\u3092\u30a4\u30f3\u30dd\u30fc\u30c8\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u4f8b\uff1aimport java.util.ArrayList;<\/li>\n<li>\u96c6\u5408\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3059\u308b\uff1a\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u3066\u3001\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002\u4f8b\uff1aArrayList list = new ArrayList();<\/li>\n<li>\u96c6\u5408\u306b\u8981\u7d20\u3092\u8ffd\u52a0\u3059\u308b\u305f\u3081\u306badd()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u65b9\u6cd5\u306f\u3001\u4f8b\u3048\u3070\u3001list.add(&#8220;element&#8221;)\u3067\u3059\u3002<\/li>\n<li>\u8981\u8bbf\u95ee\u5143\u7d20\uff1a\u8bf7\u4f7f\u7528get()\u65b9\u6cd5\u4ece\u96c6\u5408\u4e2d\u83b7\u53d6\u5143\u7d20\uff0c\u6bd4\u5982\uff1aString element = list.get(0);<\/li>\n<li>\u8981\u7d20\u306e\u5909\u66f4\uff1aset()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u96c6\u5408\u306e\u8981\u7d20\u3092\u5909\u66f4\u3057\u307e\u3059\u3002\u4f8b\uff1alist.set(0, &#8220;newElement&#8221;);<\/li>\n<li>\u5143\u7d20\u306e\u524a\u9664\uff1aremove()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u304b\u3089\u8981\u7d20\u3092\u524a\u9664\u3057\u307e\u3059\u3002\u4f8b\uff1alist.remove(0);<\/li>\n<li>\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u7e70\u308a\u8fd4\u3057\u51e6\u7406: for\u30eb\u30fc\u30d7\u3084foreach\u30eb\u30fc\u30d7\u306a\u3069\u306e\u7e70\u308a\u8fd4\u3057\u69cb\u9020\u3092\u4f7f\u7528\u3057\u3066\u3001\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u5185\u306e\u8981\u7d20\u3092\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u3057\u307e\u3059\u3002\u4f8b\u3048\u3070\uff1a<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code>for (String element : list) {\r\n    System.out.println(element);\r\n}\r\n<\/code><\/pre>\n<ol>\n<li>isEmpyt()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u304c\u7a7a\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3057\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001boolean empty = list.isEmpty();<\/li>\n<li>\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u30b5\u30a4\u30ba\u3092\u53d6\u5f97\u3059\u308b\u306b\u306f\u3001size()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u5185\u306e\u8981\u7d20\u306e\u6570\u3092\u53d6\u5f97\u3057\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001int size = list.size();<\/li>\n<li>\u96c6\u5408\u306e\u30af\u30ea\u30a2\uff1aclear()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066\u3001\u96c6\u5408\u306e\u4e2d\u306e\u3059\u3079\u3066\u306e\u8981\u7d20\u3092\u524a\u9664\u3057\u307e\u3059\u3002\u4f8b\uff1alist.clear();<\/li>\n<\/ol>\n<p>Java\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u30af\u30e9\u30b9\u306b\u306f\u4e00\u822c\u7684\u306b\u4f7f\u7528\u3055\u308c\u308b\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u7570\u306a\u308b\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u30af\u30e9\u30b9\u306b\u306f\u7570\u306a\u308b\u30e1\u30bd\u30c3\u30c9\u3084\u7279\u5fb4\u304c\u3042\u308b\u305f\u3081\u3001\u5177\u4f53\u7684\u306a\u8981\u6c42\u306b\u5408\u3063\u305f\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u30af\u30e9\u30b9\u3092\u9078\u629e\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u30af\u30e9\u30b9\u306e\u4f7f\u7528\u65b9\u6cd5\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\uff1a Java\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3059\u308b\u524d\u306b\u3001\u5bfe\u5fdc\u3059\u308b\u30d1\u30c3\u30b1\u30fc\u30b8\u3092\u30a4\u30f3\u30dd\u30fc\u30c8\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u4f8b\uff1aimport java.util.ArrayList; [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[16,26],"class_list":["post-11949","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-16","tag-26"],"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\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u30af\u30e9\u30b9\u306e\u4f7f\u3044\u65b9\u306f\u4f55\u3067\u3059\u304b\uff1f - Blog - Silicon 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content=\"Java\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u30af\u30e9\u30b9\u306e\u4f7f\u3044\u65b9\u306f\u4f55\u3067\u3059\u304b\uff1f\" \/>\n<meta property=\"og:description\" content=\"Java\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u30af\u30e9\u30b9\u306e\u4f7f\u3044\u65b9\u306f\u4f55\u3067\u3059\u304b\uff1f\u3092\u5206\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3002\u5b9f\u8df5\u7684\u306a\u4f8b\u3068\u30b3\u30fc\u30c9\u3001\u6ce8\u610f\u70b9\u3092\u542b\u3081\u3066\u521d\u5fc3\u8005\u306b\u3082\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u8aac\u660e\u3057\u307e\u3059\u3002\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/ja\/blog\/java\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u30af\u30e9\u30b9\u306e\u4f7f\u7528\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\uff1f\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2024-03-15T01:40:10+00:00\" \/>\n<meta property=\"article:modified_time\" 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