{"id":236,"date":"2017-01-17T16:00:00","date_gmt":"2017-01-17T07:00:00","guid":{"rendered":"https:\/\/java-code.jp\/?p=236"},"modified":"2020-03-03T14:02:50","modified_gmt":"2020-03-03T05:02:50","slug":"arraylist%e3%82%af%e3%83%a9%e3%82%b9","status":"publish","type":"post","link":"https:\/\/java-code.jp\/236","title":{"rendered":"ArrayList\u30af\u30e9\u30b9"},"content":{"rendered":"

\u53ef\u5909\u9577\u914d\u5217\u3092\u5229\u7528\u3059\u308b – ArrayList\u30af\u30e9\u30b9<\/em><\/p>\n

ArrayList\u306f\u3001\u5185\u90e8\u7684\u306b\u306f\u914d\u5217\u3092\u5229\u7528\u3057\u305f\u30ea\u30b9\u30c8\u69cb\u9020\u3067\u3059\u3002\u6a19\u6e96\u7684\u306a\u914d\u5217\u3068\u7570\u306a\u308b\u70b9\u306f\u3001\u30b5\u30a4\u30ba\u3092\u5f8c\u304b\u3089\u3067\u3082\u5909\u66f4\u3067\u304d\u308b\u70b9\u3067\u3059\u3002\u305d\u306e\u6027\u8cea\u4e0a\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u5024\u306b\u3088\u308b\u5024\u306e\u8aad\u307f\u66f8\u304d\u306f\u9ad8\u901f\u3067\u3059\u304c\u3001\u8981\u7d20\u306e\u633f\u5165\uff0f\u524a\u9664\u306f\u3001\u914d\u5217\u30b5\u30a4\u30ba\u304c\u5927\u304d\u304f\u306a\u308b\u307b\u3069\u3001\u307e\u305f\u3001\u64cd\u4f5c\u4f4d\u7f6e\u304c\u5148\u982d\u306b\u8fd1\u304f\u306a\u308b\u307b\u3069\u9045\u304f\u306a\u308a\u307e\u3059\u3002
\n ArrayList\u30af\u30e9\u30b9\u3067\u5229\u7528\u3067\u304d\u308b\u30e1\u30bd\u30c3\u30c9\u306b\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u3082\u306e\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
ArrayList\u30af\u30e9\u30b9\u3067\u5229\u7528\u3067\u304d\u308b\u4e3b\u306a\u30e1\u30bd\u30c3\u30c9<\/th>\n<\/tr>\n
\u30e1\u30bd\u30c3\u30c9<\/th>\n\u6982\u8981<\/th>\n<\/tr>\n
add([int index,] E e)<\/td>\n\u6307\u5b9a\u4f4d\u7f6eindex\u306b\u8981\u7d20e\u3092\u633f\u5165\uff08index\u7701\u7565\u3067\u672b\u5c3e\u306b\u633f\u5165\uff09<\/td>\n<\/tr>\n
clear()\t<\/td>\n\u30ea\u30b9\u30c8\u304b\u3089\u3059\u3079\u3066\u306e\u8981\u7d20\u3092\u524a\u9664<\/td>\n<\/tr>\n
contains(Object e)<\/td>\n\u30ea\u30b9\u30c8\u306b\u8981\u7d20o\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u304b\u3092\u5224\u5b9a<\/td>\n<\/tr>\n
get(int index)<\/td>\nindex\u756a\u76ee\u306e\u8981\u7d20\u3092\u53d6\u5f97<\/td>\n<\/tr>\n
indexOf(Object e)<\/td>\n\u8981\u7d20o\u304c\u767b\u5834\u3059\u308b\u6700\u521d\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u5024\u3092\u53d6\u5f97<\/td>\n<\/tr>\n
isEmpty()<\/td>\n\u30ea\u30b9\u30c8\u304c\u7a7a\u304b\u5224\u5b9a<\/td>\n<\/tr>\n
remove(int index\uff5cObject o)<\/td>\n\u6307\u5b9a\u306e\u8981\u7d20\u3092\u524a\u9664<\/td>\n<\/tr>\n
set(int index, E e)<\/td>\nindex\u756a\u76ee\u306e\u8981\u7d20\u3092\u8a2d\u5b9a<\/td>\n<\/tr>\n
int size()<\/td>\n\u30ea\u30b9\u30c8\u306b\u542b\u307e\u308c\u308b\u8981\u7d20\u306e\u6570\u3092\u53d6\u5f97<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u4ee5\u4e0b\u306f\u3001ArrayList\u306b\u8981\u7d20\u3092\u30bb\u30c3\u30c8\u3057\u3001\u305d\u306e\u5024\u3092\u9806\u306b\u51fa\u529b\u3059\u308b\u4f8b\u3067\u3059\u3002<\/p>\n

CollList.java<\/p>\n

\n
\r\npackage com.example.mynavi.collection;\r\n\r\nimport java.util.ArrayList;\r\nimport java.util.List;\r\n\r\npublic class CollList {\r\n  public static void main(String[] args) {\r\n    List<String> list = new ArrayList<String>() {\r\n      {\r\n        add(\"Windows\");\r\n        add(\"Linux\");\r\n        add(\"macOS\");\r\n      }\r\n    };\r\n\r\n    for (String str : list) {\r\n      System.out.println(str);\t\/\/ \u7d50\u679c\uff1aWindows\u3001Linux\u3001macOS\r\n    }\r\n\r\n    System.out.println(\"2\u756a\u76ee\u306e\u8981\u7d20\u306f\" + list.get(1));\r\n\t\/\/ \u7d50\u679c\uff1a2\u756a\u76ee\u306e\u8981\u7d20\u306fLinux\r\n    System.out.println(list.contains(\"Linux\"));\t\/\/ \u7d50\u679c\uff1atrue\r\n\r\n    if (!list.isEmpty()) {\r\n      System.out.println(\"\u8981\u7d20\u6570\u306f\" + list.size() + \"\u500b\u3067\u3059\u3002\");\r\n\t\/\/ \u7d50\u679c\uff1a\u8981\u7d20\u6570\u306f3\u500b\u3067\u3059\u3002\r\n    }\r\n\r\n    list.remove(0);\r\n    System.out.println(list);\t\/\/ \u7d50\u679c\uff1a[Linux, macOS]\r\n\r\n    list.clear();\r\n    System.out.println(list);\t\/\/ \u7d50\u679c\uff1a[]\r\n  }\r\n}\r\n<\/pre>\n
<\/div>\n
ArrayList\u3078\u306e\u633f\u5165\u306b\u969b\u3057\u3066\u306f\u3001\u30e1\u30e2\u30ea\u30fc\u306e\u518d\u5272\u308a\u5f53\u3066\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u70b9\u306b\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u3068\u3044\u3046\u306e\u3082\u3001ArrayList\u306f\u3042\u3089\u304b\u3058\u3081\u4e00\u5b9a\u30b5\u30a4\u30ba\u306e\u9818\u57df\u3092\u6e96\u5099\u3057\u3066\u3044\u307e\u3059\u304c\u3001\u3053\u308c\u304c\u4e0d\u8db3\u3057\u3066\u3044\u308b\u3068\u3001\u81ea\u52d5\u7684\u306b\u30b5\u30a4\u30ba\u3092\u62e1\u5f35\u3057\u3088\u3046\u3068\u3059\u308b\u306e\u3067\u3059\u3002
\n  \u3057\u304b\u3057\u3001\u30b5\u30a4\u30ba\u306e\u62e1\u5f35\u306f\u30aa\u30fc\u30d0\u30fc\u30d8\u30c3\u30c9\u306e\u5927\u304d\u306a\u51e6\u7406\u306a\u306e\u3067\u3001\u3067\u304d\u308b\u3060\u3051\u907f\u3051\u308b\u3079\u304d\u3067\u3059\u3002\u6700\u521d\u304b\u3089\u5fc5\u8981\u306a\u30b5\u30a4\u30ba\u304c\u5224\u3063\u3066\u3044\u308b\u5834\u5408\u306b\u306f\u3001\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5316\u306b\u969b\u3057\u3066\u30b5\u30a4\u30ba\u3092\u660e\u793a\u7684\u306b\u5ba3\u8a00\u3057\u3066\u304a\u304f\u3053\u3068\u3092\u304a\u52e7\u3081\u3057\u307e\u3059\u3002\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u30b5\u30a4\u30ba\u306f10\u3067\u3059\u3002<\/p>\n
\n
\r\nList<String> list = new ArrayList<String>(50);\r\n<\/pre>\n
<\/div>\n","protected":false},"excerpt":{"rendered":"
\u53ef\u5909\u9577\u914d\u5217\u3092\u5229\u7528\u3059\u308b – ArrayList\u30af\u30e9\u30b9 ArrayList\u306f\u3001\u5185\u90e8\u7684\u306b\u306f\u914d\u5217\u3092\u5229\u7528\u3057\u305f\u30ea\u30b9\u30c8\u69cb\u9020\u3067\u3059\u3002\u6a19\u6e96\u7684\u306a\u914d\u5217\u3068\u7570\u306a\u308b\u70b9\u306f\u3001\u30b5\u30a4\u30ba\u3092\u5f8c\u304b\u3089\u3067\u3082\u5909\u66f4\u3067\u304d\u308b\u70b9\u3067\u3059\u3002\u305d\u306e\u6027\u8cea\u4e0a\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u5024\u306b\u3088\u308b […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17],"tags":[],"class_list":["post-236","post","type-post","status-publish","format-standard","hentry","category-frame"],"_links":{"self":[{"href":"https:\/\/java-code.jp\/wp-json\/wp\/v2\/posts\/236"}],"collection":[{"href":"https:\/\/java-code.jp\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/java-code.jp\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/java-code.jp\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/java-code.jp\/wp-json\/wp\/v2\/comments?post=236"}],"version-history":[{"count":8,"href":"https:\/\/java-code.jp\/wp-json\/wp\/v2\/posts\/236\/revisions"}],"predecessor-version":[{"id":1496,"href":"https:\/\/java-code.jp\/wp-json\/wp\/v2\/posts\/236\/revisions\/1496"}],"wp:attachment":[{"href":"https:\/\/java-code.jp\/wp-json\/wp\/v2\/media?parent=236"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/java-code.jp\/wp-json\/wp\/v2\/categories?post=236"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/java-code.jp\/wp-json\/wp\/v2\/tags?post=236"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}