{"id":15900,"date":"2017-03-15T03:48:58","date_gmt":"2017-03-14T18:48:58","guid":{"rendered":"http:\/\/www.sejuku.net\/blog\/?p=15900"},"modified":"2024-05-06T11:40:53","modified_gmt":"2024-05-06T02:40:53","slug":"%e3%80%905%e5%88%86%e3%81%a7%e3%82%8f%e3%81%8b%e3%82%8bjava%e3%81%ae%e5%9f%ba%e7%a4%8e%e3%80%91list%e2%87%94map%e5%a4%89%e6%8f%9b%e3%81%a8java8%e3%81%ae%e9%81%95%e3%81%84%e3%81%8c%e4%b8%80%e6%b0%97","status":"publish","type":"post","link":"https:\/\/www.sejuku.net\/blog\/15900","title":{"rendered":"\u3010Java\u5165\u9580\u3011List\u21d4Map\u5909\u63db\u3067Java8\u306eStream\u3092\u4f7f\u3046\u65b9\u6cd5"},"content":{"rendered":"

\u3053\u3093\u306b\u3061\u306f\uff01fumiko\u3067\u3059\u3002<\/p>\n

\u5927\u6d41\u884c\u306e\u30a4\u30f3\u30d5\u30eb\u30a8\u30f3\u30b6\u3082\u53ce\u675f\u3057\u306f\u3058\u3081\u307e\u3057\u305f\u306d\u3002<\/p>\n

\u65e5\u304c\u9577\u304f\u306a\u3063\u3066\u304d\u3066\u3044\u308b\u4eca\u65e5\u306e\u3054\u308d\u3001\u7686\u69d8\u306fjava\u4f7f\u3044\u306b\u306a\u308b\u305f\u3081\u306b\u65e5\u591c\u52aa\u529b\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u3067\u3057\u3087\u3046\u3002<\/p>\n

\u4eca\u56de\u306f\u3001List\u3068Map\u306b\u3064\u3044\u3066\u3001\u3061\u3087\u3063\u3068\u30c7\u30a3\u30fc\u30d7\u306a\u8ffd\u6c42\u3092\u3057\u3066\u307f\u307e\u3059\u3002<\/p>\n

java\u306f\u8907\u6570\u306e\u30c7\u30fc\u30bf\u3092\u307e\u3068\u3081\u3066\u6271\u3046\u6a5f\u80fd\u304c\u3044\u304f\u3064\u304b\u3042\u308a\u307e\u3059\u3002<\/p>\n

\u914d\u5217\u3068List\u30af\u30e9\u30b9\u305d\u3057\u3066Map\u30af\u30e9\u30b9\u3067\u3059\u3002<\/p>\n

\u3053\u306e\u914d\u5217\u3068List\u30af\u30e9\u30b9\u305d\u3057\u3066Map\u30af\u30e9\u30b9\u306e\u5171\u901a\u70b9\u306f\u3001\u540c\u3058\u578b\u306e\u30c7\u30fc\u30bf\u3092\u8907\u6570\u306e\u5024\u3092\u683c\u7d0d<\/strong><\/span>\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3053\u3068\u3067\u3059\u3002<\/p>\n

\u3067\u306f\u9055\u3044\u306f\u4f55\u304b\u3068\u3044\u3046\u3068\u3001\u683c\u7d0d\u3067\u304d\u308b\u578b\u304c\u7570\u306a\u308a\u307e\u3059<\/strong><\/span>\u3002<\/p>\n

\u914d\u5217<\/strong><\/span>\u306f\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u578b<\/strong><\/span>\u3068\u8a00\u308f\u308c\u3066\u3044\u308b\u3001int\u578b\u3001char\u578b\u3084\u30af\u30e9\u30b9\u578b\u3082\u3064\u304f\u308c\u307e\u3059\u3002<\/p>\n

\u3057\u304b\u3057\u3001List<\/strong><\/span>\u3068Map<\/strong><\/span>\u306f\u30af\u30e9\u30b9\u3067\u3059\u304b\u3089\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u578b\u306eList\u3084Map\u3092\u3064\u304f\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u305b\u3093<\/strong><\/span>\u3002<\/p>\n

\u305d\u3057\u3066\u3001List<\/strong><\/span>\u3068Map<\/strong><\/span>\u306f\u30c7\u30fc\u30bf\u306e\u683c\u7d0d\u306e\u4ed5\u65b9\u304c\u7570\u306a\u308b<\/strong><\/span>\u305f\u3081\u3001\u30c7\u30fc\u30bf\u306e\u6271\u3044\u65b9\u3082\u7570\u306a\u308a\u307e\u3059\u3002<\/p>\n

\u3067\u306fList\u30af\u30e9\u30b9\u3068Map\u30af\u30e9\u30b9\u306f\u4f55\u304c\u7570\u306a\u308b\u306e\u3067\u3057\u3087\u3046\u304b\uff1f<\/p>\n

\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001List\u30af\u30e9\u30b9\u3068Map\u30af\u30e9\u30b9\u306b\u3064\u3044\u3066<\/p>\n

\u30fbList\u3068Map\u306e\u9055\u3044<\/strong><\/span>
\n\u30fbJava8\u3068Java8\u4ee5\u524d\u306e\u9055\u3044<\/strong><\/span><\/p>\n

\u3068\u3044\u3046\u57fa\u672c\u7684\u306a\u5185\u5bb9\u304b\u3089<\/p>\n

\u30fbList\u304b\u3089Map\u306b\u5909\u63db\u3059\u308b\u65b9\u6cd5<\/strong><\/span>
\n\u30fbMap\u304b\u3089List\u306b\u5909\u63db\u3059\u308b\u65b9\u6cd5<\/strong><\/span><\/p>\n

\u306a\u3069\u5177\u4f53\u7684\u306a\u5185\u5bb9\u306b\u3064\u3044\u3066\u3082\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n

\u4eca\u56de\u306fList\u30af\u30e9\u30b9\u3068Map\u30af\u30e9\u30b9\u306b\u3064\u3044\u3066\u3001\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3057\u307e\u3059\uff01<\/p>\n

\u306a\u304a\u3001Java\u306e\u8a18\u4e8b\u306b\u3064\u3044\u3066\u306f\u3001\u3053\u3061\u3089<\/a>\u306b\u307e\u3068\u3081\u3066\u3044\u307e\u3059\u3002<\/p>\n

List\u3068Map\u306e\u9055\u3044<\/h2>\n

\u7c21\u5358\u306b\u8a00\u3046\u3068List\u3068Map\u306e\u9055\u3044\u306f\u3001\u81ea\u5206\u3067\u30c7\u30fc\u30bf\u3092\u53d6\u308a\u51fa\u3059\u4ed5\u639b\u3051\u3092\u3064\u304f\u308c\u308b\u304b\u3001\u305d\u308c\u3068\u3082\u3001\u3064\u304f\u308c\u306a\u3044\u304b<\/strong><\/span>\u3001\u3068\u3044\u3046\u9055\u3044\u3067\u3059\u3002<\/p>\n

\u8a00\u8a9e\u4ed5\u69d8\u3068\u3057\u3066\u81ea\u52d5\u7684\u306b\u30c7\u30fc\u30bf\u3092\u53d6\u308a\u51fa\u3059\u4ed5\u7d44\u307f\u3092\u3064\u304f\u308b<\/strong><\/span>\u306e\u304cList<\/strong><\/span>\u3067\u3059\u3002<\/p>\n

\u3053\u308c\u306b\u5bfe\u3057\u3001\u81ea\u5206\u3067\u30c7\u30fc\u30bf\u3092\u53d6\u308a\u51fa\u3059\u4ed5\u639b\u3051\u3092\u3064\u304f\u308c\u308b<\/strong><\/span>\u306e\u304cMap<\/strong><\/span>\u3067\u3059\u3002<\/p>\n

List\u3068Map\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u751f\u6210\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n

JDK\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u306b\u3088\u3063\u3066\u66f8\u304d\u65b9\u304c\u9055\u3044\u307e\u3059\u3002<\/p>\n\n\n\n\n\t\n\n\t\n\t
<\/td>List<\/th>Map<\/th>\n<\/tr>\n<\/thead>\n
JDK1.4\u4ee5\u524d<\/td>List list = new ArrayList();<\/td>Map map = new HashMap();<\/td>\n<\/tr>\n
JDK1.5\u4ee5\u964d<\/td>List<String> list = new ArrayList<String>();<\/td>Map<String, Integer> map = new HashMap<String, Integer>();<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n

JDK1.5\u4ee5\u964d\u306e\u8a18\u8ff0\u5f62\u5f0f\u306e\u5834\u5408\u3001\u53f3\u8fba\u306e\u8981\u7d20\u306e\u578b\u306e\u6307\u5b9a\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u7701\u7565<\/strong><\/span>\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n

List<String> list = new ArrayList<>();<\/pre>\n
List<\/strong><\/span>\u30af\u30e9\u30b9\u306f\u683c\u7d0d\u3057\u305f\u9806\u306b\u81ea\u52d5\u7684\u306bindex\u304c\u751f\u6210\u3055\u308c\u3001\u5024\u3068\u7d10\u3065\u3051<\/strong><\/span>\u3055\u308c\u307e\u3059\u3002<\/p>\n
\u3053\u306eindex\u9806\u306b\u3057\u305f\u304c\u3063\u3066\u30c7\u30fc\u30bf\u3092\u53d6\u308a\u51fa\u3057\u307e\u3059\u3002<\/p>\n
\u660e\u793a\u7684\u306bindex\u3092\u6307\u5b9a<\/strong><\/span>\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u304c\u3001Integer\u578b\u306e\u307f\u3067\u3057\u304b\u3064\u3051\u3089\u308c\u307e\u305b\u3093\u3002<\/p>\n
\u305d\u308c\u306b\u5bfe\u3057\u3066\u3001Map<\/strong><\/span>\u30af\u30e9\u30b9\u306findex\u3068\u306a\u308bkey<\/strong><\/span>\u3068\u305d\u3057\u3066\u30c7\u30fc\u30bf\u3068\u306a\u308bvalue<\/strong><\/span>\u3092\u305d\u308c\u305e\u308c\u5b9a\u7fa9\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
\u305d\u306e\u305f\u3081\u3001key\u306b\u306fInteger\u30af\u30e9\u30b9\u3060\u3051\u3067\u306f\u306a\u304f\u3001String\u30af\u30e9\u30b9\u306a\u3069\u57fa\u672c\u30af\u30e9\u30b9\u3092\u6301\u3064\u3053\u3068\u304c\u3067\u304d\u307e\u3059<\/strong><\/span>\u3002<\/p>\n
List\u306b\u6bd4\u3079\u67d4\u8edf\u6027\u304c\u9ad8\u3044\u30c7\u30fc\u30bf\u7ba1\u7406\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u3057\u304b\u3057\u306a\u304c\u3089\u3001map<\/strong><\/span>\u30af\u30e9\u30b9\u306f\u30d7\u30ed\u30b0\u30e9\u30de\u304c\u6271\u3048\u308b\u5185\u5bb9\u304c\u591a\u3044\u5206\u3001\u64cd\u4f5c\u304c\u591a\u304f\u3001\u60c5\u5831\u91cf\u304c\u591a\u3044\u3053\u3068\u304b\u3089\u3001List\u30af\u30e9\u30b9\u306b\u6bd4\u3079\u51e6\u7406\u901f\u5ea6\u304c\u52a3\u308a\u307e\u3059<\/strong><\/span>\u3002<\/p>\n
\u9806\u6b21\u30c7\u30fc\u30bf\u3092\u53d6\u308a\u51fa\u3059\u3060\u3051<\/strong><\/span>\u306e\u76ee\u7684\u3067\u3042\u308c\u3070List<\/strong><\/span>\u304c\u9069\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
key\u3068\u95a2\u9023\u4ed8\u3051\u3066\u5024\u3092\u4fdd\u6301\u3059<\/strong><\/span>\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u306fMap<\/strong><\/span>\u304c\u9069\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u7528\u9014\u306b\u3088\u3063\u3066\u4f7f\u3044\u5206\u3051\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
\u3067\u306f\u3001List\u3068Map\u5909\u63db\u306e\u51e6\u7406\u3092Java8\u4ee5\u524d\u3068Java8\u3067\u306e\u8a18\u8ff0\u306e\u9055\u3044\u3092\u30b3\u30fc\u30c9\u30ec\u30d3\u30e5\u30fc\u3092\u901a\u3057\u3066\u3057\u3063\u304b\u308a\u7406\u89e3\u3092\u3057\u3066\u3044\u305f\u3060\u304d\u307e\u3059\u3002<\/p>\n
\u3061\u3087\u3063\u3068\u30c7\u30a3\u30fc\u30d7\u306aJava8\u306e\u4e16\u754c\u306b\u5165\u308b\u6e96\u5099\u306f\u3067\u304d\u307e\u3057\u305f\u304b\uff1f<\/p>\n
List\u3068Map\u306e\u5909\u63db\u3068Java8<\/h2>\n
\u3057\u3064\u3053\u3044\u3067\u3059\u304c\u3001List\u3068Map\u306e\u6700\u5927\u306e\u9055\u3044\u306f\u3001\u5024\u3092\u4efb\u610f\u306b\u53d6\u308a\u51fa\u3059\u305f\u3081\u306ekey\u3092\u81ea\u5206\u3067\u6307\u5b9a\u3067\u304d\u308b\u304b\u3069\u3046\u304b<\/strong><\/span>\u3067\u3059\u3002<\/p>\n
\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u751f\u6210\u306e\u8a18\u8ff0\u3092\u898b\u3066\u3082\u3001List\u304b\u3089Map\u306b\u5909\u63db\u3059\u308b\u306b\u306f\u5fc5\u305aKey\u3092\u6307\u5b9a\u3057\u3001\u305d\u306ekey\u306b\u7d10\u3065\u3051\u308b\u5024\u3092\u8a2d\u5b9a\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
\u305d\u306e\u305f\u3081\u3001List\u304b\u3089Map\u306b\u5909\u63db\u3059\u308b\u5834\u5408\u3001key\u306e\u30ea\u30b9\u30c8\u3068key\u306b\u7d10\u3065\u304f\u5024\u304c\u30bb\u30c3\u30c8\u3067\u751f\u6210\u3059\u308b\u3088\u3046\u306b\u8a2d\u8a08<\/strong><\/span>\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
Java8\u3068Java8\u4ee5\u524d\u306e\u9055\u3044<\/h3>\n
java.util\u30af\u30e9\u30b9\u306e\u8a2d\u8a08\u306b\u306fSDK\u516c\u958b\u3088\u308a\u975e\u5e38\u306b\u5b9a\u8a55\u304c\u3042\u308a\u307e\u3057\u305f\u3002<\/p>\n
\u305d\u306e\u306a\u304b\u3067\u3001\u3053\u306e\u7169\u96d1\u306a\u64cd\u4f5c\u3092\u3088\u308a\u7c21\u6613\u306a\u8a18\u8ff0\u306b\u6539\u5584\u3059\u308b\u8981\u671b\u304c\u591a\u304b\u3063\u305f\u3053\u3068\u306f\u4e8b\u5b9f\u3067\u3059\u3002<\/p>\n
Java\u53f2\u4e0a\u6700\u5927\u306e\u5909\u66f4\u3068\u8a00\u308f\u308c\u308b\u30e9\u30e0\u30c0\u5f0f<\/strong><\/span>\u3068Stream<\/strong><\/span>\u3078\u306e\u5bfe\u5fdc\u304cJava8\u3067\u306f\u884c\u308f\u308c\u307e\u3057\u305f\u3002<\/p>\n
\u3053\u308c\u306f\u3042\u304f\u307e\u3067Java\u8a00\u8a9e\u306e\u6587\u6cd5\u30ec\u30d9\u30eb\u306e\u3082\u306e\u3067\u3059\u3002<\/p>\n
\u306a\u305c\u3001Java8\u306f\u30e9\u30e0\u30c0\u5f0f\u3068Stream\u306b\u5bfe\u5fdc\u3057\u305f\u306e\u3067\u3057\u3087\u3046\u304b\uff1f<\/p>\n
\u305d\u306e\u80cc\u666f\u306b\u306f\u3001JRuby\u3084Groovy\u3001Jython\u306a\u3069\u3001java\u4e0a\u3067\u52d5\u304f\u8efd\u91cf\u8a00\u8a9e\u304c\u767b\u5834\u3057\u3001\u5bfe\u5fdc\u305b\u3056\u308b\u3092\u5f97\u306a\u3044\u72b6\u6cc1\u306b\u306a\u3063\u305f\u305f\u3081\u3067\u3059\u3002<\/p>\n
\u4ed5\u69d8\u5909\u66f4\u306f\u3001\u904e\u53bb\u306b\u4f5c\u3089\u308c\u305f\u81a8\u5927\u306a\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u52d5\u304f\u3088\u3046\u306a\u3057\u304f\u307f\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n
\u9006\u306b\u3053\u308c\u3089\u304c\u52d5\u304b\u306a\u304f\u306a\u308b\u4ed5\u69d8\u5909\u66f4\u306f\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n
\u305d\u3053\u3067\u3001Java8\u3067\u306f\u8a00\u8a9e\u4ed5\u69d8\u306b\u95a2\u3059\u308b\u65e7\u30d0\u30fc\u30b8\u30e7\u30f3\u3068\u306e\u76f8\u9055\u306f\u30b3\u30f3\u30d1\u30a4\u30e9\u3068\u30e9\u30f3\u30bf\u30a4\u30e0\u304c\u5438\u53ce<\/strong><\/span>\u3059\u308b\u4ed5\u69d8\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n
\u3053\u3046\u3057\u3066\u3001\u3088\u308a\u7c21\u6613\u306a\u8a18\u8ff0\u304c\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n
\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u30df\u30b9\u3092\u6700\u5c0f\u9650\u306b\u3068\u3069\u3081\u308b\u6700\u9069\u306a\u65b9\u6cd5\u306f\u7c21\u6613\u306a\u8a18\u8ff0\u3067\u3059\u3002<\/p>\n
\u305d\u308c\u3067\u306f\u3001\u7686\u69d8\u306b\u3082Java8\u306e\u5feb\u9069\u3055\u3092\u4f53\u611f\u3057\u3066\u3044\u305f\u3060\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n
List\u304b\u3089Map\u306b\u5909\u63db\u3059\u308b\u65b9\u6cd5<\/h2>\n
List\u304b\u3089Map\u3078\u306e\u5909\u63db\u306e\u4f8b\u3068\u3057\u3066\u3001String\u578b\u306eList\u3092\u4f5c\u6210\u3057\u3001\u305d\u306e\u5f8c\u3001\u30ad\u30fc\u306b\u306fList\u306e\u5024\u3092\u6301\u3061\u3001\u30c7\u30fc\u30bf\u306f\u6587\u5b57\u5217\u30b5\u30a4\u30ba\u3092\u5024\u306b\u3082\u3064Map\u306b\u5909\u63db\u3057\u307e\u3059\u3002<\/p>\n
\u767e\u805e\u306f\u4e00\u898b\u306b\u5982\u304b\u305a\uff01<\/p>\n
\u65e9\u901f\u30bd\u30fc\u30b9\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
Java8\u4ee5\u524d<\/h3>\n
JDK 1.4\u306e\u5834\u5408<\/h4>\n
Java8\u4ee5\u524d\u306fList\u304b\u3089Map\u306b\u5909\u63db\u3059\u308b\u5834\u5408\u3001List\u30c7\u30fc\u30bf\u3092\u9806\u6b21\u8aad\u307f\u8fbc\u307f\u306a\u304c\u3089\u3001key\u3068\u5024\u3092Map\u306b\u8ffd\u52a0<\/strong><\/span>\u3059\u308b\u64cd\u4f5c\u3057\u304b\u3067\u304d\u307e\u305b\u3093\u3067\u3057\u305f\u3002<\/p>\n
import java.util.Arrays;\r\nimport java.util.HashMap;\r\nimport java.util.List;\r\nimport java.util.Map;\r\n\r\npublic class Main {\r\n \r\n    public static void main(String[] args) {\r\n        List list = Arrays.asList(\"chocolate\", \"makaron\", \"cheesecake\", \"pudding\", \"cookie\", \"pancake\");\r\n \r\n        System.out.println(list.toString());\r\n     \r\n        Map map = new HashMap();\r\n        \/\/ 1. list\u306e\u8981\u7d20\u3092\u30eb\u30fc\u30d7\u3067\u53d6\u5f97\r\n        for(int i = 0; i < list.size(); i++) {\r\n            String s = list.get(i).toString();        \/\/ 2. \u5024\u3092\u53d6\u5f97\r\n            map.put(s, s.length());     \/\/ 3.\u30de\u30c3\u30d7\u3078\u5024\u3092\u8ffd\u52a0\r\n        }\r\n     \r\n        System.out.println(map.toString());  \/\/ 4. map\u306e\u4e2d\u8eab\u3092\u78ba\u8a8d\u3057\u307e\u3059\r\n    }\r\n\r\n}<\/pre>\n
\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n
[chocolate, makaron, cheesecake, pudding, cookie, pancake]\r\n{cookie=6, cheesecake=10, makaron=7, pancake=7, pudding=7, chocolate=9}<\/pre>\n
\u307e\u305a\u3001List\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<\/p>\n
    \n
  1. \u30ea\u30b9\u30c8\u306e\u8981\u7d20\u306e\u5024\u3092\u9806\u306b\u53d6\u5f97\u3057\u307e\u3059\u3002<\/li>\n
  2. \u6587\u5b57\u5217\u3068\u3057\u3066\u3044\u3063\u305f\u3093\u9000\u907f\u3057\u307e\u3059\u3002<\/li>\n
  3. \u30de\u30c3\u30d7\u306b\u9000\u907f\u3057\u305f\u6587\u5b57\u5217\u3092key\u306b\u3057\u3001length()\u30e1\u30bd\u30c3\u30c9\u3067\u6587\u5b57\u5217\u9577\u3092\u53d6\u5f97\u3057\u3001\u5024\u3068\u3057\u3066Map\u306bput()<\/strong><\/span>\u30e1\u30bd\u30c3\u30c9\u3067\u8ffd\u52a0\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n
    JDK 1.5\u3067Generic type\u3092\u4f7f\u7528\u3059\u308b\u65b9\u6cd5<\/h4>\n
    JDK1.5\u3088\u308aGeneric type<\/strong><\/span>\u304c\u4f7f\u3048\u308b\u3088\u3046\u306b\u306a\u3063\u305f\u305f\u3081\u3001\u82e5\u5e72\u7c21\u7d20\u306a\u8a18\u8ff0\u304c\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n
    \u3057\u304b\u3057\u3001\u51e6\u7406\u3068\u3057\u3066\u306fJDK1.4\u3068\u540c\u69d8\u3044\u3063\u305f\u3093\u3059\u3079\u3066\u306e\u8981\u7d20\u3092\u8aad\u307f\u8fbc\u3093\u3067\u51e6\u7406\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
    import java.util.Arrays;\r\nimport java.util.HashMap;\r\nimport java.util.List;\r\nimport java.util.Map;\r\n\r\n\r\npublic class Main {\r\n \r\n    public static void main(String[] args) {\r\n        List list = Arrays.asList(\"chocolate\", \"makaron\", \"cheesecake\", \"pudding\", \"cookie\", \"pancake\");\r\n \r\n        System.out.println(list.toString());\r\n     \r\n        Map map = new HashMap();\r\n        for (Object s : list) {      \/\/ 1. list\u8981\u7d20\u3092\u9806\u6b21\u8aad\u307f\u8fbc\u307f\u307e\u3059\r\n            map.put(s.toString(), s.toString().length());  \/\/ 2. map\u306b\u8ffd\u52a0\u3059\u308b\u3002\r\n        }\r\n     \r\n        System.out.println(map.toString());\r\n    }\r\n\r\n}<\/pre>\n
    \u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n
    [chocolate, makaron, cheesecake, pudding, cookie, pancake]\r\n{cookie=6, cheesecake=10, makaron=7, pancake=7, pudding=7, chocolate=9}<\/pre>\n
    Java8\u3067Stream\u3092\u4f7f\u7528\u3059\u308b\u65b9\u6cd5<\/h3>\n
    Java\u53f2\u4e0a\u6700\u5927\u306e\u5909\u66f4\u3001\u300c\u30e9\u30e0\u30c0\u5f0f\u3068stream\u5bfe\u5fdc\u300d<\/strong><\/span>\u304cJava8\u884c\u308f\u308c\u305f\u3053\u3068\u3067\u300cList\u304b\u3089Map\u306b\u5909\u63db\u3059\u308b\u8a18\u8ff0\u300d\u304c\u7c21\u6613\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n
    \u624b\u9806\u306f<\/p>\n
      \n
    1. List\u3092stream\u306b\u3057<\/strong><\/span>\u3001<\/li>\n
    2. stream\u304b\u3089List\u3092Collector\u306b\u6e21\u3059<\/strong><\/span><\/li>\n
    3. Map\u306b\u5909\u63db\u3059\u308b<\/li>\n
    4. \u30ad\u30fc\u3068\u5024\u3092\u62bd\u51fa\u3059\u308b\u95a2\u6570\u3092\u6e21\u3059<\/li>\n<\/ol>\n
      \u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n
      \u6ce8\u610f\uff01\u30ad\u30fc\u304c\u91cd\u8907\u3059\u308b\u3068\u4f8b\u5916\u304c\u767a\u751f\u3057\u307e\u3059\u3002<\/strong><\/span><\/p>\n
      \u3053\u3053\u3067\u306f\u3001\u6587\u5b57\u5217\u3092\u30ad\u30fc\u306b\u305d\u306e\u6587\u5b57\u5217\u306e\u9577\u3055\u3092\u5024\u306b\u683c\u7d0d\u3057\u305fMap\u306b\u5909\u63db\u3057\u3066\u307f\u307e\u3059\u3002<\/p>\n
      \u4ee5\u4e0b\u306e\u3088\u3046\u306a\u8a18\u8ff0\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
      Map<String, Integer> map = list.stream()      \/\/ 1. list\u3092stream()\u306b\u6e21\u3059\u3002\r\n    .collect(Collectors.toMap(   \/\/ 2. stream\u3092collect()\u30e1\u30bd\u30c3\u30c9\u306b\u6e21\u3057\u3001Collectors\u30af\u30e9\u30b9\u306eMap\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u751f\u6210\u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u884c\u3057\u307e\u3059\r\n    s -> s, \/\/ 3. Map\u30ad\u30fc\u3092\u53d6\u5f97\u3059\u308b\u30e9\u30e0\u30c0\u5f0f\r\n    s -> s.length() \/\/ 4. Map\u306e\u5024\u3092\u53d6\u5f97\u3059\u308b\u30e9\u30e0\u30c0\u5f0f\r\n));<\/pre>\n
      \u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
      import java.util.Arrays;\r\nimport java.util.ArrayList;\r\nimport java.util.List;\r\nimport java.util.Map;\r\nimport java.util.stream.Collectors;\r\n\r\npublic class Main {\r\n \r\n    public static void main(String[] args) {\r\n        List<String> list = new ArrayList<>(Arrays.asList(\"chocolate\", \"makaron\", \"cheesecake\", \"pudding\", \"cookie\", \"pancake\"));\r\n \r\n        System.out.println(list.toString());\r\n     \r\n        Map<String, Integer> map = list.stream().collect(Collectors.toMap(s -> s, s -> s.length()));\r\n     \r\n        System.out.println(map.toString());\r\n    }\r\n\r\n}<\/pre>\n
      \u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n
      [chocolate, makaron, cheesecake, pudding, cookie, pancake]\r\n{cookie=6, cheesecake=10, pancake=7, makaron=7, pudding=7, chocolate=9}<\/pre>\n
      Stream\u3067\u306e\u30b0\u30eb\u30fc\u30d4\u30f3\u30b0\u51e6\u7406<\/h3>\n
      \u3068\u304d\u306b\u306f\u3001\u5024\u3084key\u306b\u4e00\u5b9a\u306e\u898f\u5247\u3084\u95a2\u9023<\/strong><\/span>\u304c\u3042\u308b\u3068\u601d\u308f\u308c\u308b\u5834\u5408\u3001List\u3084Map\u3092\u4f7f\u3044\u5206\u3051\u305f\u3044\u3053\u3068\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n
      \u305d\u3093\u306a\u3068\u304d\u306bJava8\u3067\u306f\u30b0\u30eb\u30fc\u30d4\u30f3\u30b0\u51e6\u7406<\/strong><\/span>\u304c\u4f7f\u3048\u307e\u3059\u3002<\/p>\n
      \u624b\u9806\u3068\u3057\u3066\u306f\u3001<\/p>\n
        \n
      1. \u5024\u3092\u30b0\u30eb\u30fc\u30d7\u5206\u3051\u3057\u3001<\/li>\n
      2. \u30b0\u30eb\u30fc\u30d7\u5206\u3051\u3055\u308c\u305f\u5024\u3092\u96c6\u7d04\u3059\u308b\u95a2\u6570\u3092\u6e21\u3059<\/li>\n<\/ol>\n
        \u3068\u3044\u3046\u51e6\u7406\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
        \u3053\u3053\u3067\u306f\u3001\u201d\u5148\u982d\u306e\u4e00\u6587\u5b57\u304c\u540c\u4e00\u306e\u8981\u7d20\u3092\u30b0\u30eb\u30fc\u30d4\u30f3\u30b0\u201d\u3057\u3066\u307f\u307e\u3059\u3002<\/p>\n
        \/\/ \u5148\u982d\u306e\u4e00\u6587\u5b57\u304c\u540c\u4e00\u306e\u8981\u7d20\u3092\u30b0\u30eb\u30fc\u30d4\u30f3\u30b0\u3059\u308b\r\nMap<Character, List<String>> map = list.stream()    \/\/ 1.list\u3092stream()\u306b\u6e21\u3059\r\n    .collect(Collectors.groupingBy(s -> s.charAt(0)));    \/\/ 2.collect()\u30e1\u30bd\u30c3\u30c9\u304b\u3089Collectors.groupingBy()\u30e1\u30bd\u30c3\u30c9\u3092\u6e21\u3059<\/pre>\n
        \u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
        import java.util.Arrays;\r\nimport java.util.ArrayList;\r\nimport java.util.List;\r\nimport java.util.Map;\r\nimport java.util.stream.Collectors;\r\n\r\npublic class Main {\r\n \r\n    public static void main(String[] args) {\r\n        List<String> list = new ArrayList<>(Arrays.asList(\"chocolate\", \"makaron\", \"cheesecake\", \"pudding\", \"cookie\", \"pancake\"));\r\n \r\n        System.out.println(list.toString());\r\n     \r\n        \/\/ \u5148\u982d\u306e\u4e00\u6587\u5b57\u304c\u540c\u4e00\u306e\u8981\u7d20\u3092\u30b0\u30eb\u30fc\u30d4\u30f3\u30b0\u3059\u308b\r\n        Map<Character, List<String>> map = list.stream().collect(Collectors.groupingBy(s -> s.charAt(0)));\r\n         \r\n        \/\/ \u5148\u982d\u304c'c'\u3067\u59cb\u307e\u308b\u3082\u306e\u3092\u8868\u793a\r\n        System.out.println(map.get('c'));\r\n        \r\n        \/\/ \u5148\u982d\u304c'p'\u3067\u59cb\u307e\u308b\u3082\u306e\u3092\u8868\u793a\r\n        System.out.println(map.get('p'));\r\n         \r\n        \/\/ \u5148\u982d\u304c'm'\u3067\u59cb\u307e\u308b\u3082\u306e\u3092\u8868\u793a\r\n        System.out.println(map.get('m'));\r\n    }\r\n\r\n}<\/pre>\n
        \u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n
        [chocolate, makaron, cheesecake, pudding, cookie, pancake]\r\n[chocolate, cheesecake, cookie]\r\n[pudding, pancake]\r\n[makaron]<\/pre>\n
        list.stream()<\/strong><\/span>\u30e1\u30bd\u30c3\u30c9\u3067\u3001list\u3092\u30b9\u30c8\u30ea\u30fc\u30e0\u306b\u6e21\u3057\u307e\u3059\u3002<\/p>\n
        collect()<\/strong><\/span>\u30e1\u30bd\u30c3\u30c9\u306b\u3066\u3001map\u5185\u306e\u8981\u7d20\u3054\u3068\u306b\u30b0\u30eb\u30fc\u30d7\u3092\u3064\u304f\u308b\u30e1\u30bd\u30c3\u30c9Collectors.groupingBy()<\/strong><\/span>\u30e1\u30bd\u30c3\u30c9\u3092\u6e21\u3057\u307e\u3059\u3002<\/p>\n
        Collectors.groupingBy()\u30e1\u30bd\u30c3\u30c9\u306f\u3001map\u306ekey<\/strong><\/span>\u306b\u30b0\u30eb\u30fc\u30d7\u3054\u3068\u306b\u8b58\u5225\u3059\u308b\u305f\u3081\u306e\u5024<\/strong><\/span>\u3092\u30bb\u30c3\u30c8\u3057\u3001value<\/strong><\/span>\u306b\u306f\u30b0\u30eb\u30fc\u30d7\u306e\u5024\u3092\u4fdd\u6301<\/strong><\/span>\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
        \u3053\u3053\u3067\u306f\u5148\u982d\u306e\u4e00\u6587\u5b57\u304c\u540c\u4e00\u306e\u8981\u7d20\u3092\u30b0\u30eb\u30fc\u30d4\u30f3\u30b0\u3057\u305f\u3044\u305f\u3081\u3001\u5404\u8981\u7d20\u306e\u5148\u982d\u3092charAt(0)\u30e1\u30bd\u30c3\u30c9\u306b\u3066\u5224\u5b9a\u3057\u307e\u3059\u3002<\/p>\n
        \u5b9f\u884c\u306fmap.get<\/strong><\/span>(\u2018@\u2019)\u30e1\u30bd\u30c3\u30c9\u3067[@]\u306b[a-z]\u307e\u3067\u306e\u4efb\u610f\u306e\u82f1\u5b57\u3092\u30bb\u30c3\u30c8\u3059\u308b\u3053\u3068\u3067\u30b0\u30eb\u30fc\u30d7\u3054\u3068\u306e\u30ea\u30b9\u30c8\u3092\u5f97\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
        \u540c\u69d8\u306a\u624b\u9806\u3067\u3001<\/p>\n
        \u30fbminBy<\/strong><\/span>\u30e1\u30bd\u30c3\u30c9\uff1a\u30e9\u30e0\u30c0\u5f0f\u304c\u8fd4\u3059\u6570\u5024\u306e\u6700\u5c0f\u5024\u3092\u8fd4\u3059
        \n\u30fbmaxBy<\/strong><\/span>\u30e1\u30bd\u30c3\u30c9\uff1a\u30e9\u30e0\u30c0\u5f0f\u304c\u8fd4\u3059\u6570\u5024\u306e\u6700\u5927\u5024\u3092\u8fd4\u3059
        \n\u30fbpartitioningBy<\/strong><\/span>\u30e1\u30bd\u30c3\u30c9\uff1a\u30e9\u30e0\u30c0\u5f0f\u306e\u8981\u7d20\u3092\u6307\u5b9a\u3057\u305f\u6761\u4ef6\u3067\u5206\u5272\u3057\u3066\u8fd4\u3059
        \n\u30fbjoiningBy<\/strong><\/span>\u30e1\u30bd\u30c3\u30c9\uff1a\u8981\u7d20\u3092\u533a\u5207\u308a\u6587\u5b57\u3067\u9023\u7d50\u3057\u305f\u6587\u5b57\u5217\u3092\u53d6\u5f97\u3059\u308b<\/p>\n
        \u3068\u3044\u3046\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n
        \u4f59\u529b\u304c\u3042\u308c\u3070\u30c1\u30e3\u30ec\u30f3\u30b8\u3057\u3066\u307f\u3066\u4e0b\u3055\u3044\u3002<\/p>\n
        \u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u96c6 <\/a><\/p>\n
        Map\u304b\u3089List\u306b\u5909\u63db\u3059\u308b\u65b9\u6cd5<\/h2>\n
        Map\u304b\u3089List\u306b\u5909\u63db\u3059\u308b\u306b\u306fMap\u306ekey\u3068Value\u3092\u305d\u308c\u305e\u308c\u5225\u306b\u6e21\u3059\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
        Map\u306e\u30ad\u30fc\u306e\u30bb\u30c3\u30c8\u3092\u53d6\u5f97<\/strong><\/span>\u3059\u308b\u306b\u306fMap.keySet()<\/strong><\/span>\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n
        \u3053\u306e\u30e1\u30bd\u30c3\u30c9\u3067\u5f97\u3089\u308c\u308bSet\u306f\u3001\u5143\u306eMap\u306e\u30ad\u30fc\u3092\u53c2\u7167<\/strong><\/span>\u3057\u3066\u3044\u307e\u3059\uff08\u30b7\u30e3\u30ed\u30fc\u30fb\u30b3\u30d4\u30fc\uff09\u3002<\/p>\n
        key\u3068\u5024\u306f\u3059\u3079\u3066\u5143\u306eMap\u3068\u95a2\u9023\u4ed8\u3051\u3089\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
        \u305d\u306e\u305f\u3081\u3001Map.keySet()\u30e1\u30bd\u30c3\u30c9\u3092\u7528\u3044\u3066\u3001Set\u3092\u53d6\u5f97\u3057\u3001\u305d\u3057\u3066Map\u306e\u5185\u5bb9\u3092\u5909\u66f4\u3059\u308b\u3068\u3001\u305d\u306e\u3001Set\u306e\u5185\u5bb9\u3082\u305d\u308c\u306b\u5408\u308f\u305b\u3066\u5897\u6e1b<\/strong><\/span>\u3057\u307e\u3059\u3002<\/p>\n
        \u601d\u308f\u306c\u30d0\u30b0\u306e\u539f\u56e0\u306b\u306a\u308b\u305f\u3081\u4f7f\u3046\u969b\u306f\u6ce8\u610f\u3092\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
        \u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u304c\u7570\u306a\u308b\u3053\u3068\u4ee5\u5916\u306f\u3001Map\u304b\u3089list\u3078\u306e\u5909\u63db\u51e6\u7406\u306e\u624b\u9806\u306fJava8\u4ee5\u524d\u3068Java8\u306f\u4f55\u3089\u5909\u308f\u308a\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n
        import java.util.ArrayList;\r\nimport java.util.HashMap;\r\nimport java.util.List;\r\nimport java.util.Map;\r\n\r\npublic class Main {\r\n \r\n    public static void main(String[] args) {\r\n        Map map = new HashMap(); \r\n        map.put(\"Samurai\", \"Engineer\");\r\n        map.put(\"Soldier\", \"Warrior\");\r\n     \r\n        \/\/ 1. values()\u3067\u30de\u30c3\u30d7\u306e\u5168\u5024\u3092\u53d6\u5f97\u3059\u308b\r\n        List listValues = new ArrayList(map.values());\r\n     \r\n        \/\/ 2. keySet()\u3067\u30de\u30c3\u30d7\u306e\u30ad\u30fc\u5024\u3092\u3059\u3079\u3066\u53d6\u5f97\u3059\u308b\r\n        List listKeys = new ArrayList(map.keySet());\r\n     \r\n        \/\/ 3. \u305d\u308c\u305e\u308c\u306e\u30ea\u30b9\u30c8\u306e\u5185\u5bb9\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002\r\n        System.out.println(listValues.toString());\r\n        System.out.println(listKeys.toString());\r\n    }\r\n\r\n}<\/pre>\n
        \u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n
        [Warrior, Engineer]\r\n[Soldier, Samurai]<\/pre>\n

        \nmap.values<\/strong><\/span>()\u30e1\u30bd\u30c3\u30c9\u306b\u3066map\u306e\u5168\u5024\u306e\u30ea\u30b9\u30c8\u3092\u53d6\u5f97\u3057\u3066\u3044\u307e\u3059\u3002
        \n
        \nmap.keySet<\/strong><\/span>()\u30e1\u30bd\u30c3\u30c9\u306b\u3066map\u306e\u5168key\u306e\u30ea\u30b9\u30c8\u3092\u53d6\u5f97\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
        Stream\u3067\u5909\u63db\u9014\u4e2d\u306b\u51e6\u7406\u3092\u5165\u308c\u308b\u65b9\u6cd5<\/h3>\n
        \u3067\u306f\u3001Java8\u3068Java8\u4ee5\u524d\u3067\u306f\u4f55\u304c\u9055\u3046\u306e\u304b\u3068\u3044\u3046\u3068\u3001\u30e9\u30e0\u30c0\u5f0f\u3084stream\u3092\u7528\u3044\u3066\u9014\u4e2d\u64cd\u4f5c\u304c\u3042\u308c\u3053\u308c\u3067\u304d\u308b<\/strong><\/span>\u306e\u304cJava8\u3067\u3059\u3002<\/p>\n
        \u3067\u306f\u3001Java8\u4ee5\u524d\u3067\u306e\u65b9\u6cd5\u3068java8\u3067\u306e\u65b9\u6cd5\u3001\u305d\u308c\u305e\u308c\u306e\u51e6\u7406\u3092\u898b\u6bd4\u3079\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
        Java8\u4ee5\u524d\u306e\u65b9\u6cd5<\/h4>\n
        \u624b\u9806\u3068\u3057\u3066\u306f<\/p>\n
          \n
        1. Map\u306b\u683c\u7d0d\u3055\u308c\u305f\u3059\u3079\u3066\u306e\u8981\u7d20\u3092\u53d6\u5f97\u3001<\/li>\n
        2. \u5404\u8981\u7d20\u306e\u30ad\u30fc\u3068\u5024\u3092\u53d6\u5f97<\/li>\n<\/ol>\n
          \u3068\u3044\u3046\u51e6\u7406\u306b\u306a\u308a\u3001List\u304b\u3089Map\u3078\u306e\u8fd4\u9084\u306e\u51e6\u7406\u3068\u540c\u69d8\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
          import java.util.HashMap;\r\nimport java.util.Map;\r\nimport java.util.Set;\r\n\r\npublic class Main {\r\n \r\n    public static void main(String[] args) {\r\n        Map map = new HashMap(); \r\n        map.put(\"Samurai\", \"Engineer\");\r\n        map.put(\"Soldier\", \"Warrior\");\r\n     \r\n        \/\/ 1. Map\u306b\u683c\u7d0d\u3055\u308c\u305f\u3059\u3079\u3066\u306e\u8981\u7d20\u3092\u53d6\u5f97\r\n        Set<Map.Entry>set = map.entrySet();\r\n         \r\n        \/\/ 2. \u5404\u8981\u7d20\u306e\u30ad\u30fc\u3068\u5024\u3092\u53d6\u5f97\r\n        for (Map.Entry entry : set) {\r\n            \/\/ 3. \u3053\u3053\u306b\u64cd\u4f5c\u3092\u66f8\u304f\r\n            System.out.println(entry.getKey() + \",\" + entry.getValue());\r\n        }\r\n    }\r\n\r\n}<\/pre>\n
          \u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n
          Soldier,Warrior\r\nSamurai,Engineer<\/pre>\n
          Java8\u3067\u306e\u65b9\u6cd5<\/h4>\n
          \u30e9\u30e0\u30c0\u5f0f\u3067\u30ad\u30fc\u3068\u5024\u306e\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u3092\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n
          import java.util.HashMap;\r\nimport java.util.Map;\r\n\r\npublic class Main {\r\n \r\n    public static void main(String[] args) {\r\n        Map map = new HashMap(); \r\n        map.put(\"Samurai\", \"Engineer\");\r\n        map.put(\"Soldier\", \"Warrior\");\r\n     \r\n        map.forEach((key, value) -> System.out.println(key + \",\" + value));\r\n    }\r\n\r\n}<\/pre>\n
          \u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n
          Soldier,Warrior\r\nSamurai,Engineer<\/pre>\n
          \u540c\u3058\u51e6\u7406\u3067\u3082Java8\u4ee5\u524d\u306b\u6bd4\u3079\u3001Java8\u3067\u306f\u3068\u3066\u3082\u7c21\u7d20\u3067\u3059\u3088\u306d\u3002<\/p>\n
          Java8\u3067\u306f\u30e9\u30e0\u30c0\u5f0f\u3084stream\u3092\u7528\u3044\u3001\u64cd\u4f5c\u3092\u9023\u7d9a\u7684\u306b\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
          Java8\u306b\u3064\u3044\u3066\u3082\u3063\u3068\u8a73\u3057\u304f\u77e5\u308a\u305f\u3044\u65b9\u3078<\/h2>\n
          Java8\u306e\u65b0\u6a5f\u80fd\u3092\u4f7f\u3063\u305fList\u3068Map\u306e\u5909\u63db\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u3066\u304d\u307e\u3057\u305f\u3002<\/p>\n
          Java8\u306e\u306e\u65b0\u6a5f\u80fd\u306b\u3064\u3044\u3066\u306f\u3001\u4ed6\u306b\u3082\u4fbf\u5229\u306a\u6a5f\u80fd\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
          Java8\u306e\u65b0\u6a5f\u80fd\u306b\u3064\u3044\u3066<\/h3>\n
          Java8\u306e\u65b0\u6a5f\u80fd\u306e\u8a73\u3057\u3044\u5185\u5bb9\u306b\u3064\u3044\u3066\u306f\u3001\u3053\u3061\u3089\u3092\u53c2\u8003\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u306d\uff01<\/p>\n            \n                
          \n                
          \n                    
          \n                    \n                    <\/div>\n                    
          \n                    
          Java8\u306e\u65b0\u6a5f\u80fd\u3092\u5fb9\u5e95\u89e3\u8aac\uff01(\u30e9\u30e0\u30c0\u5f0f\u3001Stream\u306a\u3069)<\/div>\n                    
          \u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n
          filter\u3001sorted\u3001map\u306a\u3069\u306eStrem API\u306b\u3064\u3044\u3066<\/h3>\n
          Java8\u306eStream API\u306b\u306fList\u3084Map\u306a\u3069\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u30af\u30e9\u30b9\u3092\u6271\u3046\u5834\u5408\u306b\u3001filter<\/strong><\/span>\u3001sorted<\/strong><\/span>\u3001map<\/strong><\/span>\u306a\u3069\u306eAPI\u304c\u3042\u3063\u3066\u4fbf\u5229\u3067\u3059\u3002<\/p>\n
          \u8a73\u3057\u3044\u5185\u5bb9\u306b\u3064\u3044\u3066\u306f\u3001\u3053\u3061\u3089\u3092\u53c2\u8003\u306b\u3057\u3066\u4e0b\u3055\u3044\u306d\u3002<\/p>\n            \n                
          \n                
          \n                    
          \n                    \n                    <\/div>\n                    
          \n                    
          \u3010Java\u5165\u9580\u3011Java8\u306e\u30e9\u30e0\u30c0\u5f0f\u306e\u4f7f\u3044\u65b9\u3068\u30e1\u30ea\u30c3\u30c8\u3068\u306f(Stream API)<\/div>\n                    
          \u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n
          \u307e\u3068\u3081<\/h2>\n
          \u3044\u304b\u304c\u3067\u3057\u305f\u304b\uff1f<\/p>\n
          List\u3068Map\u306e\u9055\u3044\u304b\u3089\u3001java8\u306e\u30e9\u30e0\u30c0\u5f0f\u3084Stream\u306b\u3064\u3044\u3066\u898b\u3066\u304d\u307e\u3057\u305f\u3002<\/p>\n
          \u30e9\u30e0\u30c0\u5f0f<\/strong><\/span>\u3084Stream<\/strong><\/span>\u3092\u4f7f\u3046\u3068\u3001list\u21d4Map\u306e\u76f8\u4e92\u5909\u63db\u304c\u7c21\u7d20\u306b\u66f8\u3051\u308b<\/strong><\/span>\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
          \u307f\u306a\u3055\u3093\u3082java8\u306e\u6069\u6075\u306b\u6388\u304b\u308a\u3001\u4e00\u65e5\u3082\u65e9\u304f\u731b\u7363\u3001\u3044\u3048\u3001java\u4f7f\u3044\u306b\u306a\u3089\u308c\u308b\u3053\u3068\u3092\u7948\u308a\u307e\u3059\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
          \u3053\u3093\u306b\u3061\u306f\uff01fumiko\u3067\u3059\u3002 \u5927\u6d41\u884c\u306e\u30a4\u30f3\u30d5\u30eb\u30a8\u30f3\u30b6\u3082\u53ce\u675f\u3057\u306f\u3058\u3081\u307e\u3057\u305f\u306d\u3002 \u65e5\u304c\u9577\u304f\u306a\u3063\u3066\u304d\u3066\u3044\u308b\u4eca\u65e5\u306e\u3054\u308d\u3001\u7686\u69d8\u306fjava\u4f7f\u3044\u306b\u306a\u308b\u305f\u3081\u306b\u65e5\u591c\u52aa\u529b\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u3067\u3057\u3087\u3046\u3002 \u4eca\u56de\u306f\u3001List\u3068Map\u306b\u3064\u3044\u3066\u3001\u3061\u3087\u3063\u3068 […]<\/p>\n","protected":false},"author":4,"featured_media":32212,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"swell_btn_cv_data":"","footnotes":""},"categories":[2344],"tags":[67],"class_list":["post-15900","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-java-study","tag-java"],"acf":[],"yoast_head":"\n\u3010Java\u5165\u9580\u3011List\u21d4Map\u5909\u63db\u3067Java8\u306eStream\u3092\u4f7f\u3046\u65b9\u6cd5 | \u4f8d\u30a8\u30f3\u30b8\u30cb\u30a2\u30d6\u30ed\u30b0<\/title>\n<meta name=\"description\" content=\"\u3053\u306e\u8a18\u4e8b\u3067\u306f\u300c \u3010Java\u5165\u9580\u3011List\u21d4Map\u5909\u63db\u3067Java8\u306eStream\u3092\u4f7f\u3046\u65b9\u6cd5 \u300d\u306b\u3064\u3044\u3066\u3001\u8ab0\u3067\u3082\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u306b\u89e3\u8aac\u3057\u307e\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3092\u8aad\u3081\u3070\u3001\u3042\u306a\u305f\u306e\u60a9\u307f\u304c\u89e3\u6c7a\u3059\u308b\u3060\u3051\u3058\u3083\u306a\u304f\u3001\u65b0\u305f\u306a\u6c17\u4ed8\u304d\u3082\u767a\u898b\u3067\u304d\u308b\u3053\u3068\u3067\u3057\u3087\u3046\u3002\u304a\u60a9\u307f\u306e\u65b9\u306f\u305c\u3072\u3054\u4e00\u8aad\u304f\u3060\u3055\u3044\u3002\" \/>\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.sejuku.net\/blog\/15900\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u3010Java\u5165\u9580\u3011List\u21d4Map\u5909\u63db\u3067Java8\u306eStream\u3092\u4f7f\u3046\u65b9\u6cd5 | 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