{"id":127201,"date":"2024-03-25T01:32:20","date_gmt":"2024-03-24T16:32:20","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/list%e3%81%aeretainall%e3%83%a1%e3%82%bd%e3%83%83%e3%83%89%e3%81%afjava%e3%81%a7%e3%81%a9%e3%81%ae%e3%82%88%e3%81%86%e3%81%ab%e4%bd%bf%e3%81%84%e3%81%be%e3%81%99%e3%81%8b%ef%bc%9f\/"},"modified":"2024-03-27T18:06:31","modified_gmt":"2024-03-27T09:06:31","slug":"list%e3%81%aeretainall%e3%83%a1%e3%82%bd%e3%83%83%e3%83%89%e3%81%afjava%e3%81%a7%e3%81%a9%e3%81%ae%e3%82%88%e3%81%86%e3%81%ab%e4%bd%bf%e3%81%84%e3%81%be%e3%81%99%e3%81%8b%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/list%e3%81%aeretainall%e3%83%a1%e3%82%bd%e3%83%83%e3%83%89%e3%81%afjava%e3%81%a7%e3%81%a9%e3%81%ae%e3%82%88%e3%81%86%e3%81%ab%e4%bd%bf%e3%81%84%e3%81%be%e3%81%99%e3%81%8b%ef%bc%9f\/","title":{"rendered":"List\u306eretainAll\u30e1\u30bd\u30c3\u30c9\u306fJava\u3067\u3069\u306e\u3088\u3046\u306b\u4f7f\u3044\u307e\u3059\u304b\uff1f"},"content":{"rendered":"

List\u306eretainAll()\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u30ea\u30b9\u30c8\u5185\u306e\u6307\u5b9a\u3057\u305f\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u8981\u7d20\u3068\u540c\u3058\u8981\u7d20\u3060\u3051\u3092\u6b8b\u3057\u30012\u3064\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u5171\u901a\u90e8\u5206\u3092\u53d6\u5f97\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n

\u3053\u306e\u65b9\u6cd5\u306e\u4f7f\u3044\u65b9\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n

    \n
  1. ArrayList()\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f7f\u7528\u3057\u3066List\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3059\u308b(\u4f8b\uff1aList list = new ArrayList();)<\/li>\n
  2. \u6bd4\u8f03\u5bfe\u8c61\u3068\u306a\u308b\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002\u4f8b\uff1aList compareList = new ArrayList();<\/li>\n
  3. \u30ea\u30b9\u30c8\u306b\u8ffd\u52a0\u3059\u308b: list.add(“A”); list.add(“B”); list.add(“C”);<\/li>\n
  4. compareList\u306b\u8981\u7d20\u3092\u8ffd\u52a0\u3059\u308b\u3002\u4f8b\uff1acompareList.add(\u201cB\u201d); compareList.add(\u201cC\u201d); compareList.add(\u201cD\u201d);<\/li>\n
  5. \u4ea4\u5dee\u96c6\u5408\u3092\u5f97\u308b\u305f\u3081\u306bretainAll\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002\u4f8b\uff1alist.retainAll(\u6bd4\u8f03\u30ea\u30b9\u30c8)<\/li>\n
  6. \u30ea\u30b9\u30c8\u3092\u51fa\u529b\u3057\u307e\u3059\u3002\u4f8b\uff1aSystem.out.println(list); \/\/ \u51fa\u529b\u306f[B, C]\u3068\u306a\u308a\u307e\u3059\u3002<\/li>\n<\/ol>\n

    retainAll()\u30e1\u30bd\u30c3\u30c9\u306f\u5143\u306e\u30ea\u30b9\u30c8\u3092\u5909\u66f4\u3057\u3001\u30ea\u30b9\u30c8\u306b\u3042\u308b\u6307\u5b9a\u3055\u308c\u305f\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306b\u306a\u3044\u8981\u7d20\u3092\u524a\u9664\u3057\u3001\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306b\u3042\u308b\u3082\u306e\u3068\u540c\u3058\u8981\u7d20\u3092\u6b8b\u3057\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

    List\u306eretainAll()\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u30ea\u30b9\u30c8\u5185\u306e\u6307\u5b9a\u3057\u305f\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u8981\u7d20\u3068\u540c\u3058\u8981\u7d20\u3060\u3051\u3092\u6b8b\u3057\u30012\u3064\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u5171\u901a\u90e8\u5206\u3092\u53d6\u5f97\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002 \u3053\u306e\u65b9\u6cd5\u306e\u4f7f\u3044\u65b9\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002 ArrayList()\u30aa […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-127201","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nList\u306eretainAll\u30e1\u30bd\u30c3\u30c9\u306fJava\u3067\u3069\u306e\u3088\u3046\u306b\u4f7f\u3044\u307e\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\/list\u306eretainall\u30e1\u30bd\u30c3\u30c9\u306fjava\u3067\u3069\u306e\u3088\u3046\u306b\u4f7f\u3044\u307e\u3059\u304b\uff1f\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"List\u306eretainAll\u30e1\u30bd\u30c3\u30c9\u306fJava\u3067\u3069\u306e\u3088\u3046\u306b\u4f7f\u3044\u307e\u3059\u304b\uff1f\" \/>\n<meta property=\"og:description\" content=\"List\u306eretainAll()\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u30ea\u30b9\u30c8\u5185\u306e\u6307\u5b9a\u3057\u305f\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u8981\u7d20\u3068\u540c\u3058\u8981\u7d20\u3060\u3051\u3092\u6b8b\u3057\u30012\u3064\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u5171\u901a\u90e8\u5206\u3092\u53d6\u5f97\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002 \u3053\u306e\u65b9\u6cd5\u306e\u4f7f\u3044\u65b9\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002 ArrayList()\u30aa […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/ja\/blog\/list\u306eretainall\u30e1\u30bd\u30c3\u30c9\u306fjava\u3067\u3069\u306e\u3088\u3046\u306b\u4f7f\u3044\u307e\u3059\u304b\uff1f\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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