{"id":228,"date":"2017-01-17T16:00:00","date_gmt":"2017-01-17T07:00:00","guid":{"rendered":"https:\/\/java-code.jp\/?p=228"},"modified":"2020-03-03T14:13:08","modified_gmt":"2020-03-03T05:13:08","slug":"hashset","status":"publish","type":"post","link":"https:\/\/java-code.jp\/228","title":{"rendered":"HashSet"},"content":{"rendered":"

\u91cd\u8907\u3092\u8a31\u3055\u306a\u3044\u8981\u7d20\u306e\u96c6\u5408 – HashSet<\/em><\/p>\n

HashSet\u306f\u3001\u8981\u7d20\u306e\u91cd\u8907\u3092\u8a31\u53ef\u3057\u306a\u3044\u96c6\u5408\u69cb\u9020\u3092\u8868\u3057\u307e\u3059\u3002\u307e\u305f\u3001\u9806\u756a\u3082\u6301\u3061\u307e\u305b\u3093\u3002\u6570\u5b66\u3067\u306e\u96c6\u5408\u306b\u3082\u3088\u304f\u4f3c\u305f\u69cb\u9020\u3068\u8003\u3048\u3066\u826f\u3044\u3067\u3057\u3087\u3046\u3002
\n HashSet\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
HashSet\u30af\u30e9\u30b9\u306e\u4e3b\u306a\u30e1\u30bd\u30c3\u30c9<\/th>\n<\/tr>\n
\u30e1\u30bd\u30c3\u30c9<\/th>\n\u6982\u8981<\/th>\n<\/tr>\n
add(E e)<\/td>\n\u8981\u7d20e\u3092\u633f\u5165<\/td>\n<\/tr>\n
clear()<\/td>\n\u3059\u3079\u3066\u306e\u8981\u7d20\u3092\u524a\u9664<\/td>\n<\/tr>\n
contains(Object e)<\/td>\n\u30bb\u30c3\u30c8\u306b\u8981\u7d20e\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u304b\u3092\u5224\u5b9a<\/td>\n<\/tr>\n
isEmpty()<\/td>\n\u30bb\u30c3\u30c8\u304c\u7a7a\u304b\u3092\u5224\u5b9a<\/td>\n<\/tr>\n
remove(Object e)<\/td>\n\u8981\u7d20e\u3092\u524a\u9664<\/td>\n<\/tr>\n
size()<\/td>\n\u30bb\u30c3\u30c8\u306b\u542b\u307e\u308c\u308b\u8981\u7d20\u306e\u6570\u3092\u53d6\u5f97<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u4ee5\u4e0b\u306f\u3001HashSet\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

CollSet.java<\/p>\n

\n
\r\npackage com.example.mynavi.collection;\r\n\r\nimport java.util.HashSet;\r\nimport java.util.Set;\r\n\r\npublic class CollSet {\r\n  public static void main(String[] args) {\r\n    Set<String> set = new HashSet<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 : set) {\r\n      System.out.println(str);\t\/\/ \u7d50\u679c\uff1aLinux\u3001Windows\u3001macOS\r\n    }\r\n\r\n    System.out.println(set.contains(\"Linux\"));\t\/\/ \u7d50\u679c\uff1atrue\r\n\r\n    if (!set.isEmpty()) {\r\n      System.out.println(\"\u8981\u7d20\u6570\u306f\" + set.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    set.remove(\"Windows\");\r\n    System.out.println(set);\t\/\/ \u7d50\u679c\uff1a[Linux, macOS]\r\n    set.clear();\r\n    System.out.println(set);\t\/\/ \u7d50\u679c\uff1a[]\r\n  }\r\n}\r\n<\/pre>\n
<\/div>\n","protected":false},"excerpt":{"rendered":"
\u91cd\u8907\u3092\u8a31\u3055\u306a\u3044\u8981\u7d20\u306e\u96c6\u5408 – HashSet HashSet\u306f\u3001\u8981\u7d20\u306e\u91cd\u8907\u3092\u8a31\u53ef\u3057\u306a\u3044\u96c6\u5408\u69cb\u9020\u3092\u8868\u3057\u307e\u3059\u3002\u307e\u305f\u3001\u9806\u756a\u3082\u6301\u3061\u307e\u305b\u3093\u3002\u6570\u5b66\u3067\u306e\u96c6\u5408\u306b\u3082\u3088\u304f\u4f3c\u305f\u69cb\u9020\u3068\u8003\u3048\u3066\u826f\u3044\u3067\u3057\u3087\u3046\u3002 HashSet\u30af\u30e9\u30b9\u3067\u5229\u7528 […]<\/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-228","post","type-post","status-publish","format-standard","hentry","category-frame"],"_links":{"self":[{"href":"https:\/\/java-code.jp\/wp-json\/wp\/v2\/posts\/228"}],"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=228"}],"version-history":[{"count":9,"href":"https:\/\/java-code.jp\/wp-json\/wp\/v2\/posts\/228\/revisions"}],"predecessor-version":[{"id":1500,"href":"https:\/\/java-code.jp\/wp-json\/wp\/v2\/posts\/228\/revisions\/1500"}],"wp:attachment":[{"href":"https:\/\/java-code.jp\/wp-json\/wp\/v2\/media?parent=228"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/java-code.jp\/wp-json\/wp\/v2\/categories?post=228"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/java-code.jp\/wp-json\/wp\/v2\/tags?post=228"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}