{"id":39514,"date":"2023-02-24T22:37:40","date_gmt":"2022-12-19T21:03:27","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e6%88%91%e5%b0%86c%e7%9a%84linq%e7%a7%bb%e6%a4%8d%e5%88%b0java%e4%b8%8a%e5%b0%9d%e8%af%95%e4%ba%86%e4%b8%80%e4%b8%8b-jlinqer\/"},"modified":"2024-04-29T16:07:17","modified_gmt":"2024-04-29T08:07:17","slug":"%e6%88%91%e5%b0%86c%e7%9a%84linq%e7%a7%bb%e6%a4%8d%e5%88%b0java%e4%b8%8a%e5%b0%9d%e8%af%95%e4%ba%86%e4%b8%80%e4%b8%8b-jlinqer","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e6%88%91%e5%b0%86c%e7%9a%84linq%e7%a7%bb%e6%a4%8d%e5%88%b0java%e4%b8%8a%e5%b0%9d%e8%af%95%e4%ba%86%e4%b8%80%e4%b8%8b-jlinqer\/","title":{"rendered":"\u6211\u5c06C#\u7684LINQ\u79fb\u690d\u5230Java\u4e0a\u5c1d\u8bd5\u4e86\u4e00\u4e0b – jLinqer"},"content":{"rendered":"

\u6211\u60f3\u5728Java\u4e2d\u4f7f\u7528LINQ\u3002<\/h1>\n

\u6211\u521b\u5efa\u4e86\u4e00\u4e2a\u53ef\u4ee5\u5728Java\u4e2d\u4f7f\u7528\u7684LINQ\u5e93\u3002\u5b83\u53ef\u4ee5\u89e3\u51b3\u5728Java8\u7684Stream\u4e2d\u65e0\u6cd5\u5f88\u597d\u8868\u8fbe\u7684\u56f0\u6270\uff0c\u800cC#\u7684LINQ\u53ef\u4ee5\u6d41\u7545\u5730\u8868\u8fbe\u3002<\/p>\n

jLinqer<\/h1>\n

jLinqer\u662f\u4e00\u4e2a\u53ef\u4ee5\u5728Java\u4e2d\u4f7f\u7528LINQ\uff08Language INtegrated Query: \u7edf\u5408\u8bed\u8a00\u67e5\u8be2\uff09\u7684\u5e93\u3002\u5b83\u8fd8\u6dfb\u52a0\u4e86\u4e00\u4e9bC#\u4e2d\u7684LINQ\u548cJava8\u7684Stream\u6240\u7f3a\u5c11\u7684\u529f\u80fd\uff0c\u4f8b\u5982selectMany\uff0cUnion\uff0cIntersect\uff0cExcept\u7b49\u3002<\/p>\n

\u600e\u4e48\u7528<\/h2>\n

\u5982\u679c\u8981\u5728Gradle\u4e2d\u4f7f\u7528\uff0c\u8bf7\u6ce8\u518c\u4ee5\u4e0b\u5185\u5bb9\u3002<\/p>\n

'<\/span>com.github.jlinqer:jlinqer:1.0.0<\/span>'<\/span>\r\n<\/code><\/pre>\n
\u5982\u679c\u60a8\u5728Maven\u4e2d\u4f7f\u7528\uff0c\u8bf7\u6ce8\u518c\u4ee5\u4e0bpom.xml\u6587\u4ef6\u3002<\/p>\n
\r\n<dependency><\/span>\r\n    <groupId><\/span>com.github.jlinqer<\/groupId><\/span>\r\n    <artifactId><\/span>jlinqer<\/artifactId><\/span>\r\n    <version><\/span>1.0.0<\/version><\/span>\r\n<\/dependency><\/span>\r\n\r\n<\/code><\/pre>\n
\u5982\u679c\u60a8\u4e0d\u4f7f\u7528Maven\uff0c\u5e76\u4e14\u76f4\u63a5\u4f7f\u7528jLinqer\u7684jar\u6587\u4ef6\uff0c\u8bf7\u4ece\u4ee5\u4e0b\u5730\u5740\u4e0b\u8f7d\u3002<\/p>\n
Maven\uff0c”jLinqer”\uff0chttps:\/\/oss.sonatype.org\/content\/groups\/public\/com\/github\/jlinqer\/jlinqer\/1.0.0\/jlinqer-1.0.0.jar<\/p>\n
LINQ – jLinqer\u517c\u5bb9\u77e9\u9635<\/h2>\n
\n
\u6a5f\u80fdLINQ(C#)jLinqer(Java)Stream(Java)\u3010\u57fa\u672c\u3011<\/strong><\/p>\n
\u62bd\u51faWherewhere<\/a>filter\u5c04\u5f71Selectselect<\/a>map\u4e26\u3079\u66ff\u3048(\u6607\u9806)OrderByorderBy<\/a>sorted\u4e26\u3079\u66ff\u3048(\u964d\u9806)OrderByDescendingorderByDescending<\/a>n\/a\u5f8c\u7d9a\u3092\u4e26\u3079\u66ff\u3048(\u6607\u9806)ThenBythenBy<\/a>n\/a\u5f8c\u7d9a\u3092\u4e26\u3079\u66ff\u3048(\u964d\u9806)ThenByDescendingthenByDescending<\/a>n\/a\u5e73\u5766\u5316\u3057\u3066\u5c04\u5f71SelectManyselectMany<\/a>flatMap\u3010\u62bd\u51fa\u7cfb\u3011<\/strong><\/p>\n
\uff4e\u4ef6\u98db\u3070\u3059Skipskip<\/a>skip\u6761\u4ef6\u3092\u6e80\u305f\u3059\u307e\u3067\u98db\u3070\u3059SkipWhileskipWhile<\/a>n\/a\uff4e\u4ef6\u307e\u3067\u6d41\u3059Taketake<\/a>limit\u6761\u4ef6\u3092\u6e80\u305f\u3059\u307e\u3067\u6d41\u3059TakeWhiletakeWhile<\/a>n\/a\u3010\u5408\u6210\u7cfb\u3011<\/strong><\/p>\n
\u9023\u7d50Concatconcat<\/a>concat\u7a4d\u96c6\u5408Intersectintersect<\/a>n\/a\u548c\u96c6\u5408Unionunion<\/a>n\/a\u5dee\u96c6\u5408Exceptexcept<\/a>n\/a\u5185\u90e8\u7d50\u5408Joinjoin<\/a>n\/a\u5916\u90e8\u7d50\u5408GroupJoingroupJoin<\/a>n\/a\u4e26\u3073\u3092\u9006\u306b\u3059\u308bReversereverse<\/a>n\/a2\u3064\u306e\u5024\u3092\u63c3\u3048\u3066\u6d41\u3059Zipzip<\/a>n\/a\u3010\u30b0\u30eb\u30fc\u30d7\u5316\u3001\u96c6\u8a08\u7cfb\u3011<\/strong><\/p>\n
\u91cd\u8907\u3092\u7121\u304f\u3059Distinctdistinct<\/a>distinct\u7573\u307f\u8fbc\u307fAggregateaggregate<\/a>reduce\u30b0\u30eb\u30fc\u30d7\u5316GroupBygroupBy<\/a>Collectors.groupingBy\u5e73\u5747AverageaverageXXX<\/a>Collectors.summarizingXXX\u4ef6\u6570Countcount<\/a>n\/a\u4ef6\u6570LongCountlongCount<\/a>count\u6700\u5927Maxmax<\/a>max\u6700\u5c0fMinmin<\/a>min\u5408\u8a08SumsumXXX<\/a>Collectors.summarizingXXX\u5148\u982dFirstfirst<\/a>findFirst\u5148\u982dFirstOrDefaultfirstOrDefault<\/a>n\/a\u7d42\u7aefLastlast<\/a>n\/a\u7d42\u7aefLastOrDefaultlastOrDefault<\/a>n\/a1\u4ef6\u306e\u5024\u3092\u5f97\u308bSinglesingle<\/a>n\/a1\u4ef6\u306e\u5024\u3092\u5f97\u308bSingleOrDefaultsingleOrDefault<\/a>n\/a\u7a7a\u306a\u3089\u65e2\u5b9a\u5024\u3092\u8fd4\u3059DefaultIfEmptydefaultIfEmpty<\/a>n\/a\u6307\u5b9a\u756a\u76ee\u306e\u8981\u7d20\u53d6\u5f97ElementAtelementAt<\/a>n\/a\u6307\u5b9a\u756a\u76ee\u306e\u8981\u7d20\u53d6\u5f97ElementAtOrDefaultelementAtOrDefault<\/a>n\/a\u5168\u30c7\u30fc\u30bf\u304c\u6761\u4ef6\u306b\u30de\u30c3\u30c1\u3059\u308b\u304b\uff1fAllall<\/a>allMatch\u3044\u305a\u308c\u304b\u306e\u30c7\u30fc\u30bf\u304c\u6761\u4ef6\u306b\u30de\u30c3\u30c1\u3059\u308b\u304b\uff1fAnyany<\/a>anyMatch\u3010\u751f\u6210\u7cfb\u3011<\/strong><\/p>\n
\u7a7aEmptyempty<\/a>n\/a\u7bc4\u56f2\u3092\u751f\u6210Rangerange<\/a>n\/a\u7e70\u308a\u8fd4\u3059Repeatrepeat<\/a>n\/a\u3010\u305d\u306e\u4ed6\u3011<\/strong><\/p>\n
\u5168\u8981\u7d20\u4e00\u81f4SequenceEqualsequenceEqual<\/a>n\/a\u30ad\u30e3\u30b9\u30c8Castcast<\/a>n\/a\u4e00\u81f4\u3059\u308b\u578b\u306e\u307f\u62bd\u51faOfTypeofType<\/a>n\/a<\/div>\n<\/div>\n
\u4f7f\u7528\u65b9\u6cd5<\/h2>\n
\u5c06java.util.List \u66ff\u6362\u6210 com.github.jlinqer.collections.List \u5e76\u4f7f\u7528\u3002<\/p>\n
\u5728\u54ea\u91cc<\/h3>\n
List<\/span><<\/span>Integer<\/span>><\/span> list<\/span> =<\/span> new<\/span> List<\/span><>(<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>);<\/span>\r\n\r\nList<\/span><<\/span>Integer<\/span>><\/span> actual<\/span> =<\/span> list<\/span>.<\/span>where<\/span>(<\/span>x<\/span> -><\/span> x<\/span> ==<\/span> 1<\/span> ||<\/span> x<\/span> ==<\/span> 3<\/span>).<\/span>toList<\/span>();<\/span>\r\n\r\nassertEquals<\/span>(<\/span>true<\/span> ,<\/span> actual<\/span>.<\/span>contains<\/span>(<\/span>1<\/span>));<\/span>\r\nassertEquals<\/span>(<\/span>false<\/span>,<\/span> actual<\/span>.<\/span>contains<\/span>(<\/span>2<\/span>));<\/span>\r\nassertEquals<\/span>(<\/span>true<\/span> ,<\/span> actual<\/span>.<\/span>contains<\/span>(<\/span>3<\/span>));<\/span>\r\n<\/code><\/pre>\n
\u9009\u62e9 z\u00e9)<\/h3>\n
List<\/span><<\/span>Person<\/span>><\/span> list<\/span> =<\/span> new<\/span> List<\/span><>(<\/span>\r\n        new<\/span> Person<\/span>(<\/span>\"React\"<\/span>   ,<\/span> 1<\/span>),<\/span>\r\n        new<\/span> Person<\/span>(<\/span>\"Angular\"<\/span> ,<\/span> 3<\/span>),<\/span>\r\n        new<\/span> Person<\/span>(<\/span>\"Backbone\"<\/span>,<\/span> 5<\/span>)<\/span>\r\n);<\/span>\r\n\r\nList<\/span><<\/span>String<\/span>><\/span> actual<\/span> =<\/span> list<\/span>.<\/span>select<\/span>(<\/span>x<\/span> -><\/span> x<\/span>.<\/span>name<\/span>).<\/span>toList<\/span>();<\/span>\r\n\r\nassertEquals<\/span>(<\/span>\"React\"<\/span>   ,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>0<\/span>));<\/span>\r\nassertEquals<\/span>(<\/span>\"Angular\"<\/span> ,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>1<\/span>));<\/span>\r\nassertEquals<\/span>(<\/span>\"Backbone\"<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>2<\/span>));<\/span>\r\n<\/code><\/pre>\n
\u6309\u7167\u987a\u5e8f\u6446\u653e<\/h3>\n
List<\/span><<\/span>String<\/span>><\/span> list<\/span> =<\/span> new<\/span> List<\/span><>(<\/span>\"Backbone\"<\/span>,<\/span> \"Angular\"<\/span>,<\/span> \"React\"<\/span>);<\/span>\r\n\r\nList<\/span><<\/span>String<\/span>><\/span> actual<\/span> =<\/span> list<\/span>.<\/span>orderBy<\/span>(<\/span>x<\/span> -><\/span> x<\/span>).<\/span>toList<\/span>();<\/span>\r\n\r\nassertEquals<\/span>(<\/span>\"Angular\"<\/span> ,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>0<\/span>));<\/span>\r\nassertEquals<\/span>(<\/span>\"Backbone\"<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>1<\/span>));<\/span>\r\nassertEquals<\/span>(<\/span>\"React\"<\/span>   ,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>2<\/span>));<\/span>\r\n<\/code><\/pre>\n
\u6309\u964d\u5e8f\u6392\u5e8f<\/h3>\n
List<\/span><<\/span>String<\/span>><\/span> list<\/span> =<\/span> new<\/span> List<\/span><>(<\/span>\"Backbone\"<\/span>,<\/span> \"Angular\"<\/span>,<\/span> \"React\"<\/span>);<\/span>\r\n\r\nList<\/span><<\/span>String<\/span>><\/span> actual<\/span> =<\/span> list<\/span>.<\/span>orderByDescending<\/span>(<\/span>x<\/span> -><\/span> x<\/span>).<\/span>toList<\/span>();<\/span>\r\n\r\nassertEquals<\/span>(<\/span>\"React\"<\/span>   ,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>0<\/span>));<\/span>\r\nassertEquals<\/span>(<\/span>\"Backbone\"<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>1<\/span>));<\/span>\r\nassertEquals<\/span>(<\/span>\"Angular\"<\/span> ,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>2<\/span>));<\/span>\r\n<\/code><\/pre>\n
\u7136\u540e\u6309\u7167<\/h3>\n
List<\/span><<\/span>Person<\/span>><\/span> list<\/span> =<\/span> new<\/span> List<\/span><>(<\/span>\r\n        new<\/span> Person<\/span>(<\/span>\"Angular2\"<\/span>,<\/span> 2<\/span>),<\/span>\r\n        new<\/span> Person<\/span>(<\/span>\"Angular1\"<\/span>,<\/span> 2<\/span>),<\/span>\r\n        new<\/span> Person<\/span>(<\/span>\"React\"<\/span>   ,<\/span> 1<\/span>)<\/span>\r\n);<\/span>\r\n\r\nList<\/span><<\/span>String<\/span>><\/span> actual<\/span> =<\/span> list<\/span>.<\/span>orderBy<\/span>(<\/span>x<\/span> -><\/span> x<\/span>.<\/span>age<\/span>).<\/span>thenBy<\/span>(<\/span>x<\/span> -><\/span> x<\/span>.<\/span>name<\/span>).<\/span>toList<\/span>();<\/span>\r\n\r\nassertEquals<\/span>(<\/span>\"React\"<\/span> ,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>0<\/span>).<\/span>name<\/span>);<\/span>\r\nassertEquals<\/span>(<\/span>\"Angular1\"<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>1<\/span>).<\/span>name<\/span>);<\/span>\r\nassertEquals<\/span>(<\/span>\"Angular2\"<\/span>   ,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>2<\/span>).<\/span>name<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u7136\u540e\u6309\u964d\u5e8f\u6392\u5217<\/h3>\n
List<\/span><<\/span>Person<\/span>><\/span> list<\/span> =<\/span> new<\/span> List<\/span><>(<\/span>\r\n        new<\/span> Person<\/span>(<\/span>\"Angular2\"<\/span>,<\/span> 2<\/span>),<\/span>\r\n        new<\/span> Person<\/span>(<\/span>\"Angular1\"<\/span>,<\/span> 2<\/span>),<\/span>\r\n        new<\/span> Person<\/span>(<\/span>\"React\"<\/span>   ,<\/span> 1<\/span>)<\/span>\r\n);<\/span>\r\n\r\nList<\/span><<\/span>String<\/span>><\/span> actual<\/span> =<\/span> list<\/span>.<\/span>orderBy<\/span>(<\/span>x<\/span> -><\/span> x<\/span>.<\/span>age<\/span>).<\/span>thenByDescending<\/span>(<\/span>x<\/span> -><\/span> x<\/span>.<\/span>name<\/span>).<\/span>toList<\/span>();<\/span>\r\n\r\nassertEquals<\/span>(<\/span>\"React\"<\/span> ,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>0<\/span>).<\/span>name<\/span>);<\/span>\r\nassertEquals<\/span>(<\/span>\"Angular2\"<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>1<\/span>).<\/span>name<\/span>);<\/span>\r\nassertEquals<\/span>(<\/span>\"Angular1\"<\/span>   ,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>2<\/span>).<\/span>name<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u9009\u591a\u4e2a (Select multiple)<\/h3>\n
List<\/span><<\/span>Person<\/span>><\/span> list<\/span> =<\/span> new<\/span> List<\/span><>(<\/span>\r\n        new<\/span> Person<\/span>(<\/span>\"Angular\"<\/span>,<\/span> 3<\/span>,<\/span> new<\/span> List<\/span>(<\/span>\"1.0.1\"<\/span>,<\/span> \"1.0.2\"<\/span>)),<\/span>\r\n        new<\/span> Person<\/span>(<\/span>\"React\"<\/span>  ,<\/span> 1<\/span>,<\/span> new<\/span> List<\/span>(<\/span>\"2.0.1\"<\/span>,<\/span> \"2.0.2\"<\/span>))<\/span>\r\n);<\/span>\r\n\r\nList<\/span><<\/span>String<\/span>><\/span> actual<\/span> =<\/span> list<\/span>.<\/span>selectMany<\/span>(<\/span>x<\/span> -><\/span> x<\/span>.<\/span>versionHistory<\/span>).<\/span>toList<\/span>();<\/span>\r\n\r\nassertEquals<\/span>(<\/span>\"1.0.1\"<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>0<\/span>));<\/span>\r\nassertEquals<\/span>(<\/span>\"1.0.2\"<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>1<\/span>));<\/span>\r\nassertEquals<\/span>(<\/span>\"2.0.1\"<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>2<\/span>));<\/span>\r\nassertEquals<\/span>(<\/span>\"2.0.2\"<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>3<\/span>));<\/span>\r\n<\/code><\/pre>\n
\u8df3\u8fc7<\/h3>\n
List<\/span><<\/span>Integer<\/span>><\/span> list<\/span> =<\/span> new<\/span> List<\/span><>(<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>);<\/span>\r\n\r\nList<\/span><<\/span>Integer<\/span>><\/span> actual<\/span> =<\/span> list<\/span>.<\/span>skip<\/span>(<\/span>2<\/span>).<\/span>toList<\/span>();<\/span>\r\n\r\nassertEquals<\/span>(<\/span>3<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>0<\/span>).<\/span>intValue<\/span>());<\/span>\r\n<\/code><\/pre>\n
\u8df3\u8fc7\u5f53\u6ee1\u8db3\u6761\u4ef6\u65f6<\/h3>\n
List<\/span><<\/span>Integer<\/span>><\/span> list<\/span> =<\/span> new<\/span> List<\/span><>(<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>,<\/span> 4<\/span>,<\/span> 5<\/span>);<\/span>\r\n\r\nList<\/span><<\/span>Integer<\/span>><\/span> actual<\/span> =<\/span> list<\/span>.<\/span>skipWhile<\/span>(<\/span>x<\/span> -><\/span> x<\/span> <=<\/span> 3<\/span>).<\/span>toList<\/span>();<\/span>\r\n\r\nassertEquals<\/span>(<\/span>4<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>0<\/span>).<\/span>intValue<\/span>());<\/span>\r\nassertEquals<\/span>(<\/span>5<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>1<\/span>).<\/span>intValue<\/span>());<\/span>\r\n<\/code><\/pre>\n
\u8fdb\u884c<\/h3>\n
List<\/span><<\/span>String<\/span>><\/span> list<\/span> =<\/span> new<\/span> List<\/span><>(<\/span>\"Backbone\"<\/span>,<\/span> \"Angular\"<\/span>,<\/span> \"React\"<\/span>);<\/span>\r\n\r\nList<\/span><<\/span>String<\/span>><\/span> actual<\/span> =<\/span> list<\/span>.<\/span>take<\/span>(<\/span>2<\/span>).<\/span>toList<\/span>();<\/span>\r\n\r\nassertEquals<\/span>(<\/span>2<\/span>,<\/span> actual<\/span>.<\/span>size<\/span>());<\/span>\r\nassertEquals<\/span>(<\/span>\"Backbone\"<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>0<\/span>));<\/span>\r\nassertEquals<\/span>(<\/span>\"Angular\"<\/span> ,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>1<\/span>));<\/span>\r\n<\/code><\/pre>\n
\u53d6\u51fa\u7b26\u5408\u689d\u4ef6\u7684\u5143\u7d20<\/h3>\n
List<\/span><<\/span>String<\/span>><\/span> list<\/span> =<\/span> new<\/span> List<\/span><>(<\/span>\"Backbone\"<\/span>,<\/span> \"Angular\"<\/span>,<\/span> \"React\"<\/span>);<\/span>\r\n\r\nList<\/span><<\/span>String<\/span>><\/span> actual<\/span> =<\/span> list<\/span>.<\/span>takeWhile<\/span>(<\/span>x<\/span> -><\/span> x<\/span>.<\/span>equals<\/span>(<\/span>\"Backbone\"<\/span>)<\/span> ||<\/span> x<\/span>.<\/span>equals<\/span>(<\/span>\"Angular\"<\/span>)).<\/span>toList<\/span>();<\/span>\r\n\r\nassertEquals<\/span>(<\/span>2<\/span>,<\/span> actual<\/span>.<\/span>size<\/span>());<\/span>\r\nassertEquals<\/span>(<\/span>\"Backbone\"<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>0<\/span>));<\/span>\r\nassertEquals<\/span>(<\/span>\"Angular\"<\/span> ,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>1<\/span>));<\/span>\r\n<\/code><\/pre>\n
\u8fde\u63a5<\/h3>\n
List<\/span><<\/span>Integer<\/span>><\/span> first<\/span>  =<\/span> new<\/span> List<\/span><>(<\/span>1<\/span>,<\/span> 2<\/span>);<\/span>\r\nList<\/span><<\/span>Integer<\/span>><\/span> second<\/span> =<\/span> new<\/span> List<\/span><>(<\/span>2<\/span>,<\/span> 3<\/span>);<\/span>\r\n\r\nList<\/span><<\/span>Integer<\/span>><\/span> actual<\/span> =<\/span> first<\/span>.<\/span>concat<\/span>(<\/span>second<\/span>).<\/span>toList<\/span>();<\/span>\r\n\r\nassertEquals<\/span>(<\/span>1<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>0<\/span>).<\/span>intValue<\/span>());<\/span>\r\nassertEquals<\/span>(<\/span>2<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>1<\/span>).<\/span>intValue<\/span>());<\/span>\r\nassertEquals<\/span>(<\/span>2<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>2<\/span>).<\/span>intValue<\/span>());<\/span>\r\nassertEquals<\/span>(<\/span>3<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>3<\/span>).<\/span>intValue<\/span>());<\/span>\r\n<\/code><\/pre>\n
\u4ea4\u53c9\u70b9<\/h3>\n
List<\/span><<\/span>Integer<\/span>><\/span> first<\/span>  =<\/span> new<\/span> List<\/span><>(<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>);<\/span>\r\nList<\/span><<\/span>Integer<\/span>><\/span> second<\/span> =<\/span> new<\/span> List<\/span><>(<\/span>1<\/span>,<\/span> 3<\/span>);<\/span>\r\n\r\nList<\/span><<\/span>Integer<\/span>><\/span> actual<\/span> =<\/span> first<\/span>.<\/span>intersect<\/span>(<\/span>second<\/span>).<\/span>toList<\/span>();<\/span>\r\n\r\nassertEquals<\/span>(<\/span>1<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>0<\/span>).<\/span>intValue<\/span>());<\/span>\r\nassertEquals<\/span>(<\/span>3<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>1<\/span>).<\/span>intValue<\/span>());<\/span>\r\n<\/code><\/pre>\n
\u5de5\u4f1a<\/h3>\n
List<\/span><<\/span>Integer<\/span>><\/span> first<\/span> =<\/span> new<\/span> List<\/span><>(<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>);<\/span>\r\nList<\/span><<\/span>Integer<\/span>><\/span> second<\/span> =<\/span> new<\/span> List<\/span><>(<\/span>0<\/span>,<\/span> 1<\/span>,<\/span> 3<\/span>,<\/span> 4<\/span>);<\/span>\r\n\r\nList<\/span><<\/span>Integer<\/span>><\/span> actual<\/span> =<\/span> first<\/span>.<\/span>union<\/span>(<\/span>second<\/span>).<\/span>toList<\/span>();<\/span>\r\n\r\nassertEquals<\/span>(<\/span>5<\/span>,<\/span> actual<\/span>.<\/span>size<\/span>());<\/span>\r\nassertEquals<\/span>(<\/span>1<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>0<\/span>).<\/span>intValue<\/span>());<\/span>\r\nassertEquals<\/span>(<\/span>2<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>1<\/span>).<\/span>intValue<\/span>());<\/span>\r\nassertEquals<\/span>(<\/span>3<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>2<\/span>).<\/span>intValue<\/span>());<\/span>\r\nassertEquals<\/span>(<\/span>0<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>3<\/span>).<\/span>intValue<\/span>());<\/span>\r\nassertEquals<\/span>(<\/span>4<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>4<\/span>).<\/span>intValue<\/span>());<\/span>\r\n<\/code><\/pre>\n
\u9664\u4e86…\u4ee5\u5916<\/h3>\n
List<\/span><<\/span>Integer<\/span>><\/span> first<\/span>  =<\/span> new<\/span> List<\/span><>(<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>);<\/span>\r\nList<\/span><<\/span>Integer<\/span>><\/span> second<\/span> =<\/span> new<\/span> List<\/span><>(<\/span>1<\/span>,<\/span> 3<\/span>);<\/span>\r\n\r\nList<\/span><<\/span>Integer<\/span>><\/span> actual<\/span> =<\/span> first<\/span>.<\/span>except<\/span>(<\/span>second<\/span>).<\/span>toList<\/span>();<\/span>\r\n\r\nassertEquals<\/span>(<\/span>2<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>0<\/span>).<\/span>intValue<\/span>());<\/span>\r\n<\/code><\/pre>\n
\u52a0\u5165<\/h3>\n
List<\/span><<\/span>Javascript<\/span>><\/span> outer<\/span> =<\/span> new<\/span> List<\/span><>(<\/span>\r\n        new<\/span> Javascript<\/span>(<\/span>\"Angular\"<\/span>,<\/span> 1<\/span>),<\/span>\r\n        new<\/span> Javascript<\/span>(<\/span>\"React\"<\/span>  ,<\/span> 4<\/span>),<\/span>\r\n        new<\/span> Javascript<\/span>(<\/span>\"ES2016\"<\/span> ,<\/span> 5<\/span>)<\/span>\r\n);<\/span>\r\nList<\/span><<\/span>Javascript<\/span>><\/span> inner<\/span> =<\/span> new<\/span> List<\/span><>(<\/span>\r\n        new<\/span> Javascript<\/span>(<\/span>\"Angular\"<\/span>,<\/span> 2<\/span>),<\/span>\r\n        new<\/span> Javascript<\/span>(<\/span>\"Angular\"<\/span>,<\/span> 3<\/span>),<\/span>\r\n        new<\/span> Javascript<\/span>(<\/span>\"ES2016\"<\/span> ,<\/span> 6<\/span>),<\/span>\r\n        new<\/span> Javascript<\/span>(<\/span>\"ES7\"<\/span>    ,<\/span> 7<\/span>)<\/span>\r\n);<\/span>\r\n\r\nFunction<\/span><<\/span>Javascript<\/span>,<\/span> String<\/span>><\/span> outerKey<\/span> =<\/span> (<\/span>x<\/span>)<\/span> -><\/span> x<\/span>.<\/span>name<\/span>;<\/span>\r\nFunction<\/span><<\/span>Javascript<\/span>,<\/span> String<\/span>><\/span> innerKey<\/span> =<\/span> (<\/span>y<\/span>)<\/span> -><\/span> y<\/span>.<\/span>name<\/span>;<\/span>\r\nBiFunction<\/span><<\/span>Javascript<\/span>,<\/span> Javascript<\/span>,<\/span> Javascript<\/span>><\/span> selector<\/span> =<\/span> (<\/span>x<\/span>,<\/span> y<\/span>)<\/span> -><\/span> new<\/span> Javascript<\/span>(<\/span>x<\/span>.<\/span>name<\/span>,<\/span> y<\/span>.<\/span>age<\/span>);<\/span>\r\nList<\/span><<\/span>Javascript<\/span>><\/span> actual<\/span> =<\/span> outer<\/span>.<\/span>join<\/span>(<\/span>inner<\/span>,<\/span> outerKey<\/span>,<\/span> innerKey<\/span>,<\/span> selector<\/span>).<\/span>toList<\/span>();<\/span>\r\n\r\nassertEquals<\/span>(<\/span>3<\/span>,<\/span> actual<\/span>.<\/span>size<\/span>());<\/span>\r\nassertEquals<\/span>(<\/span>\"Angular\"<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>0<\/span>).<\/span>name<\/span>);<\/span>\r\nassertEquals<\/span>(<\/span>\"Angular\"<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>1<\/span>).<\/span>name<\/span>);<\/span>\r\nassertEquals<\/span>(<\/span>\"ES2016\"<\/span> ,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>2<\/span>).<\/span>name<\/span>);<\/span>\r\nassertEquals<\/span>(<\/span>2<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>0<\/span>).<\/span>age<\/span>);<\/span>\r\nassertEquals<\/span>(<\/span>3<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>1<\/span>).<\/span>age<\/span>);<\/span>\r\nassertEquals<\/span>(<\/span>6<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>2<\/span>).<\/span>age<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u7fa4\u7ec4\u52a0\u5165<\/h3>\n
List<\/span><<\/span>Javascript<\/span>><\/span> outer<\/span> =<\/span> new<\/span> List<\/span><>(<\/span>\r\n        new<\/span> Javascript<\/span>(<\/span>\"Angular\"<\/span>,<\/span> 1<\/span>),<\/span>\r\n        new<\/span> Javascript<\/span>(<\/span>\"React\"<\/span>  ,<\/span> 4<\/span>),<\/span>\r\n        new<\/span> Javascript<\/span>(<\/span>\"ES2016\"<\/span> ,<\/span> 5<\/span>)<\/span>\r\n);<\/span>\r\nList<\/span><<\/span>Javascript<\/span>><\/span> inner<\/span> =<\/span> new<\/span> List<\/span><>(<\/span>\r\n        new<\/span> Javascript<\/span>(<\/span>\"Angular\"<\/span>,<\/span> 2<\/span>),<\/span>\r\n        new<\/span> Javascript<\/span>(<\/span>\"Angular\"<\/span>,<\/span> 3<\/span>),<\/span>\r\n        new<\/span> Javascript<\/span>(<\/span>\"ES2016\"<\/span> ,<\/span> 6<\/span>),<\/span>\r\n        new<\/span> Javascript<\/span>(<\/span>\"ES7\"<\/span>    ,<\/span> 7<\/span>)<\/span>\r\n);<\/span>\r\n\r\nFunction<\/span><<\/span>Javascript<\/span>,<\/span> String<\/span>><\/span> outerKey<\/span> =<\/span> (<\/span>x<\/span>)<\/span> -><\/span> x<\/span>.<\/span>name<\/span>;<\/span>\r\nFunction<\/span><<\/span>Javascript<\/span>,<\/span> String<\/span>><\/span> innerKey<\/span> =<\/span> (<\/span>y<\/span>)<\/span> -><\/span> y<\/span>.<\/span>name<\/span>;<\/span>\r\nBiFunction<\/span><<\/span>Javascript<\/span>,<\/span> IEnumerable<\/span><<\/span>Javascript<\/span>>,<\/span> Javascript<\/span>><\/span> selector<\/span> =<\/span> (<\/span>x<\/span>,<\/span> y<\/span>)<\/span> -><\/span> new<\/span> Javascript<\/span>(<\/span>x<\/span>.<\/span>name<\/span>,<\/span> y<\/span>.<\/span>select<\/span>(<\/span>z<\/span> -><\/span> z<\/span>.<\/span>age<\/span>));<\/span>\r\nList<\/span><<\/span>Javascript<\/span>><\/span> actual<\/span> =<\/span> outer<\/span>.<\/span>groupJoin<\/span>(<\/span>inner<\/span>,<\/span> outerKey<\/span>,<\/span> innerKey<\/span>,<\/span> selector<\/span>).<\/span>toList<\/span>();<\/span>\r\n\r\nassertEquals<\/span>(<\/span>3<\/span>,<\/span> actual<\/span>.<\/span>size<\/span>());<\/span>\r\nassertEquals<\/span>(<\/span>\"Angular\"<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>0<\/span>).<\/span>name<\/span>);<\/span>\r\nassertEquals<\/span>(<\/span>\"React\"<\/span>  ,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>1<\/span>).<\/span>name<\/span>);<\/span>\r\nassertEquals<\/span>(<\/span>\"ES2016\"<\/span> ,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>2<\/span>).<\/span>name<\/span>);<\/span>\r\nassertEquals<\/span>(<\/span>2<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>0<\/span>).<\/span>ages<\/span>.<\/span>elementAt<\/span>(<\/span>0<\/span>));<\/span>\r\nassertEquals<\/span>(<\/span>3<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>0<\/span>).<\/span>ages<\/span>.<\/span>elementAt<\/span>(<\/span>1<\/span>));<\/span>\r\nassertEquals<\/span>(<\/span>0<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>1<\/span>).<\/span>ages<\/span>.<\/span>count<\/span>());<\/span>\r\nassertEquals<\/span>(<\/span>6<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>2<\/span>).<\/span>ages<\/span>.<\/span>elementAt<\/span>(<\/span>0<\/span>));<\/span>\r\n<\/code><\/pre>\n
\u9006\u8f6c<\/h3>\n
List<\/span><<\/span>Integer<\/span>><\/span> list<\/span> =<\/span> new<\/span> List<\/span><>(<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>);<\/span>\r\n\r\nList<\/span><<\/span>Integer<\/span>><\/span> actual<\/span> =<\/span> list<\/span>.<\/span>reverse<\/span>().<\/span>toList<\/span>();<\/span>\r\n\r\nassertEquals<\/span>(<\/span>3<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>0<\/span>).<\/span>intValue<\/span>());<\/span>\r\nassertEquals<\/span>(<\/span>2<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>1<\/span>).<\/span>intValue<\/span>());<\/span>\r\nassertEquals<\/span>(<\/span>1<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>2<\/span>).<\/span>intValue<\/span>());<\/span>\r\n<\/code><\/pre>\n
\u62c9\u94fe<\/h3>\n
List<\/span><<\/span>Integer<\/span>><\/span> first<\/span> =<\/span> new<\/span> List<\/span><>(<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>);<\/span>\r\nList<\/span><<\/span>String<\/span>><\/span> second<\/span> =<\/span> new<\/span> List<\/span><>(<\/span>\"Angular\"<\/span>,<\/span> \"React\"<\/span>,<\/span> \"Backbone\"<\/span>);<\/span>\r\n\r\nList<\/span><<\/span>Integer<\/span>><\/span> actual<\/span> =<\/span> first<\/span>.<\/span>zip<\/span>(<\/span>second<\/span>,<\/span> (<\/span>x<\/span>,<\/span> y<\/span>)<\/span> -><\/span> String<\/span>.<\/span>format<\/span>(<\/span>\"%s %d\"<\/span>,<\/span> x<\/span>,<\/span> y<\/span>)).<\/span>toList<\/span>();<\/span>\r\n\r\nassertEquals<\/span>(<\/span>\"1 Angular\"<\/span> ,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>0<\/span>));<\/span>\r\nassertEquals<\/span>(<\/span>\"2 React\"<\/span>   ,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>1<\/span>));<\/span>\r\nassertEquals<\/span>(<\/span>\"3 Backbone\"<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>2<\/span>));<\/span>\r\n<\/code><\/pre>\n
\u72ec\u7279\u7684 (d\u00fa t\u00e8 de)<\/h3>\n
List<\/span><<\/span>Integer<\/span>><\/span> list<\/span> =<\/span>\r\n        new<\/span> List<\/span><>(<\/span>\r\n                1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>,<\/span>\r\n                1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>,<\/span> 4<\/span>\r\n        );<\/span>\r\n\r\nList<\/span><<\/span>Integer<\/span>><\/span> actual<\/span> =<\/span> list<\/span>.<\/span>distinct<\/span>().<\/span>toList<\/span>();<\/span>\r\n\r\nassertEquals<\/span>(<\/span>1<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>0<\/span>).<\/span>intValue<\/span>());<\/span>\r\nassertEquals<\/span>(<\/span>2<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>1<\/span>).<\/span>intValue<\/span>());<\/span>\r\nassertEquals<\/span>(<\/span>3<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>2<\/span>).<\/span>intValue<\/span>());<\/span>\r\nassertEquals<\/span>(<\/span>4<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>3<\/span>).<\/span>intValue<\/span>());<\/span>\r\n<\/code><\/pre>\n
\u6c47\u603b<\/h3>\n
List<\/span><<\/span>Integer<\/span>><\/span> list<\/span> =<\/span> new<\/span> List<\/span><>(<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>);<\/span>\r\n\r\nint<\/span> actual<\/span> =<\/span> list<\/span>.<\/span>aggregate<\/span>((<\/span>sum<\/span>,<\/span> elem<\/span>)<\/span> -><\/span> sum<\/span> +<\/span> elem<\/span>);<\/span>\r\n\r\nassertEquals<\/span>(<\/span>6<\/span>,<\/span> actual<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u6309\u7167\u5206\u7ec4<\/h3>\n
List<\/span><<\/span>Person<\/span>><\/span> list<\/span> =<\/span> new<\/span> List<\/span><>(<\/span>\r\n        new<\/span> Person<\/span>(<\/span>\"React\"<\/span>   ,<\/span> 1<\/span>),<\/span>\r\n        new<\/span> Person<\/span>(<\/span>\"Angular\"<\/span> ,<\/span> 1<\/span>),<\/span>\r\n        new<\/span> Person<\/span>(<\/span>\"Backbone\"<\/span>,<\/span> 5<\/span>)<\/span>\r\n);<\/span>\r\n\r\nMap<\/span><<\/span>Integer<\/span>,<\/span> IEnumerable<\/span><<\/span>Person<\/span>>><\/span> actual<\/span> =<\/span> list<\/span>.<\/span>groupBy<\/span>(<\/span>x<\/span> -><\/span> x<\/span>.<\/span>age<\/span>);<\/span>\r\n\r\nassertEquals<\/span>(<\/span>true<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>1<\/span>).<\/span>any<\/span>(<\/span>x<\/span> -><\/span> x<\/span>.<\/span>name<\/span>.<\/span>equals<\/span>(<\/span>\"React\"<\/span>)));<\/span>\r\nassertEquals<\/span>(<\/span>true<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>1<\/span>).<\/span>any<\/span>(<\/span>x<\/span> -><\/span> x<\/span>.<\/span>name<\/span>.<\/span>equals<\/span>(<\/span>\"Angular\"<\/span>)));<\/span>\r\nassertEquals<\/span>(<\/span>true<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>5<\/span>).<\/span>any<\/span>(<\/span>x<\/span> -><\/span> x<\/span>.<\/span>name<\/span>.<\/span>equals<\/span>(<\/span>\"Backbone\"<\/span>)));<\/span>\r\n<\/code><\/pre>\n
\u5e73\u5747<\/h3>\n
List<\/span><<\/span>Long<\/span>><\/span> listLong<\/span> =<\/span> new<\/span> List<\/span><>(<\/span>1<\/span>l<\/span>,<\/span> 2<\/span>l<\/span>,<\/span> 3<\/span>l<\/span>,<\/span> 4<\/span>l<\/span>);<\/span>\r\n\r\ndouble<\/span> actualLong<\/span> =<\/span> listLong<\/span>.<\/span>averageLong<\/span>(<\/span>x<\/span> -><\/span> x<\/span>);<\/span>\r\n\r\nassertEquals<\/span>(<\/span>2.5d<\/span>,<\/span> actualLong<\/span>,<\/span> 0<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u8ba1\u6570<\/h3>\n
List<\/span><<\/span>String<\/span>><\/span> list<\/span> =<\/span> new<\/span> List<\/span><>(<\/span>\"Backbone\"<\/span>,<\/span> \"Angular\"<\/span>,<\/span> \"React\"<\/span>);<\/span>\r\n\r\nlong<\/span> actual<\/span> =<\/span> list<\/span>.<\/span>longCount<\/span>();<\/span>\r\nint<\/span> actualNone<\/span> =<\/span> list<\/span>.<\/span>count<\/span>(<\/span>x<\/span> -><\/span> x<\/span>.<\/span>equals<\/span>(<\/span>\"jquery\"<\/span>));<\/span>\r\n\r\nassertEquals<\/span>(<\/span>3<\/span>,<\/span> actual<\/span>);<\/span>\r\nassertEquals<\/span>(<\/span>0<\/span>,<\/span> actualNone<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u9a6c\u514b\u65af<\/h3>\n
List<\/span><<\/span>Double<\/span>><\/span> listDouble<\/span> =<\/span> new<\/span> List<\/span><>(<\/span>1<\/span>d<\/span>,<\/span> 2<\/span>d<\/span>,<\/span> 3<\/span>d<\/span>);<\/span>\r\n\r\ndouble<\/span> actualDouble<\/span> =<\/span> listDouble<\/span>.<\/span>max<\/span>(<\/span>x<\/span> -><\/span> x<\/span>);<\/span>\r\n\r\nassertEquals<\/span>(<\/span>3<\/span>d<\/span>,<\/span> actualDouble<\/span>,<\/span> 0<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u8ff7\u4f60<\/h3>\n
List<\/span><<\/span>BigDecimal<\/span>><\/span> listBigDecimal<\/span> =<\/span> new<\/span> List<\/span><>(<\/span>\r\n        new<\/span> BigDecimal<\/span>(<\/span>1<\/span>d<\/span>),<\/span>\r\n        new<\/span> BigDecimal<\/span>(<\/span>2<\/span>d<\/span>),<\/span>\r\n        new<\/span> BigDecimal<\/span>(<\/span>3<\/span>d<\/span>)<\/span>\r\n);<\/span>\r\n\r\nBigDecimal<\/span> actualBigDecimal<\/span> =<\/span> listBigDecimal<\/span>.<\/span>min<\/span>(<\/span>x<\/span> -><\/span> x<\/span>);<\/span>\r\n\r\nassertEquals<\/span>(<\/span>1<\/span>d<\/span>,<\/span> actualBigDecimal<\/span>.<\/span>doubleValue<\/span>(),<\/span> 0<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u4ee5\u4e0b\u662f\u5bf9\u539f\u59cb\u53e5\u5b50\u7684\u6c49\u8bed\u540c\u4e49\u53e5\uff1a<\/h3>\n
\u603b\u7ed3<\/p>\n
List<\/span><<\/span>Integer<\/span>><\/span> listInt<\/span> =<\/span> new<\/span> List<\/span><>(<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>);<\/span>\r\n\r\nint<\/span> actualInt<\/span> =<\/span> listInt<\/span>.<\/span>sumInt<\/span>(<\/span>x<\/span> -><\/span> x<\/span>);<\/span>\r\n\r\nassertEquals<\/span>(<\/span>6<\/span>,<\/span> actualInt<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u9996\u5148<\/h3>\n
List<\/span><<\/span>String<\/span>><\/span> list<\/span> =<\/span> new<\/span> List<\/span><>(<\/span>\"Backbone\"<\/span>,<\/span> \"Angular\"<\/span>,<\/span> \"React\"<\/span>);<\/span>\r\n\r\nString<\/span> actualFirst<\/span>   =<\/span> list<\/span>.<\/span>firstOrDefault<\/span>();<\/span>\r\nString<\/span> actualMatch<\/span>   =<\/span> list<\/span>.<\/span>firstOrDefault<\/span>(<\/span>x<\/span> -><\/span> x<\/span>.<\/span>equals<\/span>(<\/span>\"Angular\"<\/span>));<\/span>\r\nString<\/span> actualUnMatch<\/span> =<\/span> list<\/span>.<\/span>firstOrDefault<\/span>(<\/span>x<\/span> -><\/span> x<\/span>.<\/span>equals<\/span>(<\/span>\"jquery\"<\/span>));<\/span>\r\n\r\nassertEquals<\/span>(<\/span>\"Backbone\"<\/span>,<\/span> actualFirst<\/span>);<\/span>\r\nassertEquals<\/span>(<\/span>\"Angular\"<\/span> ,<\/span> actualMatch<\/span>);<\/span>\r\nassertEquals<\/span>(<\/span>null<\/span>      ,<\/span> actualUnMatch<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u6700\u540e\u4e00\u4e2a\u6216\u9ed8\u8ba4<\/h3>\n
List<\/span><<\/span>Integer<\/span>><\/span> list<\/span> =<\/span> new<\/span> List<\/span><>(<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>);<\/span>\r\nList<\/span><<\/span>Integer<\/span>><\/span> listEmpty<\/span> =<\/span> new<\/span> List<\/span><>();<\/span>\r\n\r\nint<\/span> actual<\/span> =<\/span> list<\/span>.<\/span>lastOrDefault<\/span>();<\/span>\r\nInteger<\/span> actualDefaultNone<\/span> =<\/span> listEmpty<\/span>.<\/span>lastOrDefault<\/span>(<\/span>x<\/span> -><\/span> x<\/span> ==<\/span> 0<\/span>);<\/span>\r\n\r\nassertEquals<\/span>(<\/span>3<\/span>,<\/span> actual<\/span>);<\/span>\r\nassertEquals<\/span>(<\/span>null<\/span>,<\/span> actualDefaultNone<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u552f\u4e00\u7684\u9009\u9879<\/h3>\n
List<\/span><<\/span>Integer<\/span>><\/span> listMany<\/span> =<\/span> new<\/span> List<\/span><>(<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>);<\/span>\r\nList<\/span><<\/span>Integer<\/span>><\/span> listEmpty<\/span> =<\/span> new<\/span> List<\/span><>();<\/span>\r\n\r\nint<\/span> actualFilter<\/span> =<\/span> listMany<\/span>.<\/span>singleOrDefault<\/span>(<\/span>x<\/span> -><\/span> x<\/span> ==<\/span> 3<\/span>);<\/span>\r\nInteger<\/span> actualUnMatch<\/span> =<\/span> listEmpty<\/span>.<\/span>singleOrDefault<\/span>(<\/span>x<\/span> -><\/span> x<\/span> ==<\/span> 0<\/span>);<\/span>\r\n\r\nassertEquals<\/span>(<\/span>3<\/span>,<\/span> actualFilter<\/span>);<\/span>\r\nassertEquals<\/span>(<\/span>null<\/span>,<\/span> actualUnMatch<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u9ed8\u8ba4\u60c5\u51b5\u4e0b\u4e3a\u7a7a<\/h3>\n
List<\/span><<\/span>String<\/span>><\/span> listEmpty<\/span> =<\/span> new<\/span> List<\/span><>();<\/span>\r\n\r\nList<\/span><<\/span>String<\/span>><\/span> actualDefault<\/span> =<\/span> listEmpty<\/span>.<\/span>defaultIfEmpty<\/span>(<\/span>\"ES7\"<\/span>).<\/span>toList<\/span>();<\/span>\r\n\r\nassertEquals<\/span>(<\/span>\"ES7\"<\/span>,<\/span> actualDefault<\/span>.<\/span>get<\/span>(<\/span>0<\/span>));<\/span>\r\n<\/code><\/pre>\n
\u53d6\u51fa\u5143\u7d20\u6216\u9ed8\u8ba4<\/h3>\n
List<\/span><<\/span>Integer<\/span>><\/span> list<\/span> =<\/span> new<\/span> List<\/span><>(<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>);<\/span>\r\n\r\nint<\/span> actual<\/span> =<\/span> list<\/span>.<\/span>elementAtOrDefault<\/span>(<\/span>2<\/span>);<\/span>\r\nInteger<\/span> actualDefault<\/span> =<\/span> list<\/span>.<\/span>elementAtOrDefault<\/span>(<\/span>3<\/span>);<\/span>\r\n\r\nassertEquals<\/span>(<\/span>3<\/span>,<\/span> actual<\/span>);<\/span>\r\nassertEquals<\/span>(<\/span>null<\/span>,<\/span> actualDefault<\/span>);<\/span>\r\n<\/code><\/pre>\n
the students are required to wear uniforms to school.<\/h3>\n
List<\/span><<\/span>String<\/span>><\/span> list<\/span> =<\/span> new<\/span> List<\/span><>(<\/span>\"Backbone\"<\/span>,<\/span> \"Angular\"<\/span>,<\/span> \"React\"<\/span>);<\/span>\r\n\r\nboolean<\/span> actual<\/span> =<\/span> list<\/span>.<\/span>all<\/span>(<\/span>x<\/span> -><\/span> x<\/span>.<\/span>equals<\/span>(<\/span>\"Angular\"<\/span>)<\/span> ||<\/span> x<\/span>.<\/span>equals<\/span>(<\/span>\"Backbone\"<\/span>)<\/span> ||<\/span> x<\/span>.<\/span>equals<\/span>(<\/span>\"React\"<\/span>));<\/span>\r\nboolean<\/span> actualNotFound<\/span> =<\/span> list<\/span>.<\/span>all<\/span>(<\/span>x<\/span> -><\/span> x<\/span>.<\/span>equals<\/span>(<\/span>\"Angular\"<\/span>)<\/span> ||<\/span> x<\/span>.<\/span>equals<\/span>(<\/span>\"React\"<\/span>));<\/span>\r\n\r\nassertEquals<\/span>(<\/span>true<\/span>,<\/span> actual<\/span>);<\/span>\r\nassertEquals<\/span>(<\/span>false<\/span>,<\/span> actualNotFound<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u4efb\u4f55<\/h3>\n
List<\/span><<\/span>String<\/span>><\/span> list<\/span> =<\/span> new<\/span> List<\/span><>(<\/span>\"Backbone\"<\/span>,<\/span> \"Angular\"<\/span>,<\/span> \"React\"<\/span>);<\/span>\r\n\r\nboolean<\/span> actual<\/span> =<\/span> list<\/span>.<\/span>any<\/span>(<\/span>x<\/span> -><\/span> x<\/span>.<\/span>equals<\/span>(<\/span>\"Angular\"<\/span>));<\/span>\r\nboolean<\/span> actualNotFound<\/span> =<\/span> list<\/span>.<\/span>any<\/span>(<\/span>x<\/span> -><\/span> x<\/span>.<\/span>equals<\/span>(<\/span>\"jquery\"<\/span>));<\/span>\r\n\r\nassertEquals<\/span>(<\/span>true<\/span>,<\/span> actual<\/span>);<\/span>\r\nassertEquals<\/span>(<\/span>false<\/span>,<\/span> actualNotFound<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u7a7a\u7684 de)<\/h3>\n
List<\/span><<\/span>Double<\/span>><\/span> actual<\/span> =<\/span> IEnumerable<\/span>.<\/span>empty<\/span>(<\/span>Double<\/span>.<\/span>class<\/span>);<\/span>\r\n\r\nassertEquals<\/span>(<\/span>0<\/span>,<\/span> actual<\/span>.<\/span>count<\/span>());<\/span>\r\n<\/code><\/pre>\n
\u8303\u56f4<\/h3>\n
List<\/span><<\/span>Integer<\/span>><\/span> actual<\/span> =<\/span> IEnumerable<\/span>.<\/span>range<\/span>(-<\/span>2<\/span>,<\/span> 3<\/span>);<\/span>\r\n\r\nassertEquals<\/span>(-<\/span>2<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>0<\/span>).<\/span>intValue<\/span>());<\/span>\r\nassertEquals<\/span>(-<\/span>1<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>1<\/span>).<\/span>intValue<\/span>());<\/span>\r\nassertEquals<\/span>(<\/span>0<\/span> ,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>2<\/span>).<\/span>intValue<\/span>());<\/span>\r\n<\/code><\/pre>\n
\u91cd\u590d<\/h3>\n
List<\/span><<\/span>String<\/span>><\/span> actual<\/span> =<\/span> IEnumerable<\/span>.<\/span>repeat<\/span>(<\/span>String<\/span>.<\/span>class<\/span>,<\/span> \"Law of Cycles\"<\/span>,<\/span> 10<\/span>);<\/span>\r\n\r\nassertEquals<\/span>(<\/span>10<\/span>,<\/span> actual<\/span>.<\/span>count<\/span>());<\/span>\r\nassertEquals<\/span>(<\/span>\"Law of Cycles\"<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>9<\/span>));<\/span>\r\n<\/code><\/pre>\n
\u76f8\u7b49\u5e8f\u5217<\/h3>\n
List<\/span><<\/span>Integer<\/span>><\/span> first<\/span> =<\/span> new<\/span> List<\/span><>(<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>);<\/span>\r\nList<\/span><<\/span>Integer<\/span>><\/span> secondMatch<\/span> =<\/span> new<\/span> List<\/span><>(<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>);<\/span>\r\nList<\/span><<\/span>Integer<\/span>><\/span> secondUnMatchElem<\/span> =<\/span> new<\/span> List<\/span><>(<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 4<\/span>);<\/span>\r\n\r\nboolean<\/span> actualMatch<\/span> =<\/span> first<\/span>.<\/span>sequenceEqual<\/span>(<\/span>secondMatch<\/span>);<\/span>\r\nboolean<\/span> actualUnMatchElm<\/span> =<\/span> first<\/span>.<\/span>sequenceEqual<\/span>(<\/span>secondUnMatchElem<\/span>);<\/span>\r\n\r\nassertEquals<\/span>(<\/span>true<\/span>,<\/span> actualMatch<\/span>);<\/span>\r\nassertEquals<\/span>(<\/span>false<\/span>,<\/span> actualUnMatchElm<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u6f14\u5458<\/h3>\n
List<\/span><<\/span>Object<\/span>><\/span> list<\/span> =<\/span> new<\/span> List<\/span><>(<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>);<\/span>\r\n\r\nList<\/span><<\/span>Integer<\/span>><\/span> actual<\/span> =<\/span> list<\/span>.<\/span>cast<\/span>(<\/span>Integer<\/span>.<\/span>class<\/span>).<\/span>toList<\/span>();<\/span>\r\n\r\nassertEquals<\/span>(<\/span>1<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>0<\/span>).<\/span>intValue<\/span>());<\/span>\r\nassertEquals<\/span>(<\/span>2<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>1<\/span>).<\/span>intValue<\/span>());<\/span>\r\nassertEquals<\/span>(<\/span>3<\/span>,<\/span> actual<\/span>.<\/span>get<\/span>(<\/span>2<\/span>).<\/span>intValue<\/span>());<\/span>\r\n<\/code><\/pre>\n
\u7c7b\u578b\u7684<\/h3>\n
List<\/span><<\/span>Object<\/span>><\/span> list<\/span> =<\/span> new<\/span> List<\/span><>(<\/span>1<\/span>,<\/span> \"2\"<\/span>,<\/span> 3<\/span>,<\/span> \"4\"<\/span>);<\/span>\r\n\r\nList<\/span><<\/span>String<\/span>><\/span>  actualStr<\/span> =<\/span> list<\/span>.<\/span>ofType<\/span>(<\/span>String<\/span>.<\/span>class<\/span>).<\/span>toList<\/span>();<\/span>\r\nList<\/span><<\/span>Integer<\/span>><\/span> actualInt<\/span> =<\/span> list<\/span>.<\/span>ofType<\/span>(<\/span>Integer<\/span>.<\/span>class<\/span>).<\/span>toList<\/span>();<\/span>\r\n\r\nassertEquals<\/span>(<\/span>\"2\"<\/span>,<\/span> actualStr<\/span>.<\/span>get<\/span>(<\/span>0<\/span>));<\/span>\r\nassertEquals<\/span>(<\/span>\"4\"<\/span>,<\/span> actualStr<\/span>.<\/span>get<\/span>(<\/span>1<\/span>));<\/span>\r\nassertEquals<\/span>(<\/span>1<\/span>  ,<\/span> actualInt<\/span>.<\/span>get<\/span>(<\/span>0<\/span>).<\/span>intValue<\/span>());<\/span>\r\nassertEquals<\/span>(<\/span>3<\/span>  ,<\/span> actualInt<\/span>.<\/span>get<\/span>(<\/span>1<\/span>).<\/span>intValue<\/span>());<\/span>\r\n<\/code><\/pre>\n
\u4e3b\u984c<\/h2>\n
\u6709\u4e9b\u5730\u65b9\u65e0\u6cd5\u6a21\u62df\u5b9e\u73b0LINQ\u7684\u6807\u51c6\u884c\u4e3a\u3002<\/p>\n
\u9045\u5ef6\u8a55\u4fa1\u306b\u306a\u3063\u3066\u3044\u306a\u3044<\/p>\n
toList\u7b49\u3067\u8a55\u4fa1\u3059\u308b\u3088\u3046\u306b\u5909\u66f4\u4e2d \uff08\u5909\u66f4\u6e08\uff1a2015\/06\/22\uff09<\/p>\n
XXXorDefault<\/p>\n
Integer\uff0cLong\uff0cDouble\u306edefault\u5024\u304cnull\u3068\u306a\u3063\u3066\u3057\u307e\u3044\u307e\u3059\u3002C#\u306f\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u578b\u3067\u30b8\u30a7\u30cd\u30ea\u30af\u30b9\u304c\u53ef\u80fd\u306a\u306e\u3067\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u304c0\u304c\u8fd4\u5374\u3067\u304d\u307e\u3059<\/p>\n
GroupBy<\/p>\n
\u8fd4\u308a\u5024\u304cMap<Key, IEnumerable>\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002C#\u306fIGrouping\u3067\u3059\u3002IEnumerable\u306eMap\u304c\u5fc5\u8981\u3067\u3059\u3002\uff08\u691c\u8a0e\u4e2d\uff09<\/p>\n
sumXXX\uff0caverageXXX\uff0cminXXX\uff0cmaxXXX<\/p>\n
\u30b8\u30a7\u30cd\u30ea\u30af\u30b9\u3067\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u304c\u3067\u304d\u306a\u3044\u305f\u3081\uff0c\u30e1\u30bd\u30c3\u30c9\u540d\u306b\u578b\u3092\u542b\u307e\u305b\u3066\u3044\u307e\u3059\u3002Java\u306e\u30b8\u30a7\u30cd\u30ea\u30af\u30b9\u3067\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u3059\u308b\u8b70\u8ad6\u306fstackoverflow\u3067\u3057\u307e\u3057\u305f<\/p>\n
List\u304cjava.lang.List\u3068\u91cd\u8907\u3059\u308b<\/p>\n
List\u3092\u7d99\u627f\u3057\u3066\u65e2\u5b58\u306eList\u3092\u5b8c\u5168\u306b\u7f6e\u304d\u63db\u3048\u308b\u3088\u3046\u306b\u4f5c\u3063\u3066\u3044\u307e\u3059\u3002java.util.List\u3092com.github.jlinqer.collections.List\u306b\u5909\u66f4\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u6b63\u7d71\u6d3eIterable\u7d99\u627f\u7248\u306f\u53c2\u8003\u6587\u732e\u306e”javaLinq”\u3092\u53c2\u7167\u304f\u3060\u3055\u3044<\/p>\n
ThenBy\/ThenByDescending\u304c\u3067\u304d\u306a\u3044<\/p>\n
IOrderedEnumerable\u306e\u5b9f\u88c5\u304c\u5fc5\u8981\u3067\u3059\u3002\uff08\u691c\u8a0e\u4e2d\uff09 (\u5b9f\u88c5\u6e08\uff1a2015\/06\/27)<\/p>\n
Join\uff0cGroupJoin\uff0cZip\u304c\u3067\u304d\u306a\u3044<\/p>\n
\uff08\u691c\u8a0e\u4e2d\uff09\uff08Zip\u5b9f\u88c5\u6e08\uff1a2015\/07\/05\uff09\uff08Join\u5b9f\u88c5\u6e08\uff1a2015\/10\/26\uff09\uff08GroupJoin\u5b9f\u88c5\u6e08\uff1a2015\/10\/26\uff09<\/p>\n
\u6e90\u4ee3\u7801<\/h2>\n
\u8bf7\u5728GitHub\u4e0a\u67e5\u770b\u6e90\u4ee3\u7801\u3002\u5982\u679c\u6709\u4efb\u4f55\u529f\u80fd\u589e\u52a0\u6216\u8005\u8fd0\u884c\u969c\u788d\uff0c\u8bf7\u52a1\u5fc5\u63d0\u4ea4Pull Request\u3002<\/p>\n
\u5173\u4e8e\u7248\u672c\u95ee\u9898<\/h3>\n
    \n
  • \n
      \u9045\u5ef6\u8a55\u4fa1\u7248\uff08\u672c\u6d41\uff09<\/ul>\n<\/li>\n<\/ul>\n
      Reuben Kuhnert “javaLinq”\u3092folk\u3057\u3066\uff0cIterator\u3092\u4f7f\u7528\u3057\u3066LINQ\u306e\u9045\u5ef6\u8a55\u4fa1\u3092\u518d\u73fe\u3057\u3066\u3044\u307e\u3059
      \nhttps:\/\/github.com\/k–kato\/jLinqer<\/p>\n
      \u5148\u884c\u8a55\u4fa1\u7248\uff08\u508d\u6d41\uff09<\/p>\n
      Java 8 Stream\u3092\u4f7f\u7528\u3057\u3066LINQ\u3092\u518d\u73fe\u3057\u3066\u3044\u307e\u3059
      \nhttps:\/\/github.com\/k–kato\/jLinqer\/tree\/0786bb88d0788e1d1ee540af70cbad12244da9be<\/p>\n
      \u6587\u732e\u5f15\u7528<\/h1>\n
        \n
      1. \n
          – \u5fae\u8f6f\u53c2\u8003\u6e90\u7801\uff0c”Enumerable.cs”\uff0chttp:\/\/referencesource.microsoft.com\/#System.Core\/System\/Linq\/Enumerable.cs<\/ol>\n<\/li>\n<\/ol>\n
           <\/p>\n
            \n
          1. \n
              – GitHub\uff0c”javaLinq”\uff0chttps:\/\/github.com\/sircodesalotOfTheRound\/javaLinq<\/ol>\n<\/li>\n<\/ol>\n
               <\/p>\n
                \n
              1. \n
                  – Qiita\uff0c”LINQ to Objects \u3068 Java8-Stream API \u306e\u5bfe\u5fdc\u8868”\uff0chttp:\/\/qiita.com\/amay077\/items\/9d2941283c4a5f61f302<\/ol>\n<\/li>\n<\/ol>\n
                   <\/p>\n
                    – stackoverflow\uff0c”Generic method to perform a map-reduce operation. (Java-8)”\uff0chttp:\/\/stackoverflow.com\/questions\/30826674\/generic-method-to-perform-a-map-reduce-operation-java-8<\/ol>\n","protected":false},"excerpt":{"rendered":"
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