\u3053\u306e\u6295\u7a3f\u3067\u306f\u3001\u91cd\u8981\u306aJava SE 8\u306e\u30a4\u30f3\u30bf\u30d3\u30e5\u30fc\u306e\u8cea\u554f\u3068\u56de\u7b54\u306b\u3064\u3044\u3066\u8a71\u3057\u5408\u3044\u307e\u3059\u3002\u79c1\u306f\u3082\u30461\u3064\u306e\u6295\u7a3f\u3092\u66f8\u3044\u3066\u3001\u6b8b\u308a\u306eJava SE 8\u306e\u30a4\u30f3\u30bf\u30d3\u30e5\u30fc\u306e\u8cea\u554f\u306b\u3064\u3044\u3066\u8a71\u3057\u5408\u3044\u307e\u3059\u3002<\/p>\n
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\u3053\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u524d\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u304b\u3089\u5404\u8cea\u554f\u3092\u53d6\u308a\u4e0a\u3052\u3001\u8a73\u7d30\u306a\u8aac\u660e\u3092\u7528\u3044\u3066\u56de\u7b54\u3057\u307e\u3059\u3002\u3082\u3057\u3082\u3063\u3068\u60c5\u5831\u3084\u4f8b\u304c\u5fc5\u8981\u306a\u5834\u5408\u306f\u3001JournalDEV\u3067\u5229\u7528\u53ef\u80fd\u306aJava SE 8\u306e\u4ee5\u524d\u306e\u6295\u7a3f\u3092\u53c2\u7167\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
\u30aa\u30e9\u30af\u30eb\u682a\u5f0f\u4f1a\u793e\u306f\u3001Java SE 8\u3067\u65b0\u3057\u3044\u30b3\u30f3\u30bb\u30d7\u30c8\u3092\u5c0e\u5165\u3057\u3001\u4ee5\u4e0b\u306e\u5229\u70b9\u3092\u5c0e\u5165\u3057\u307e\u3057\u305f\u3002<\/p>\n
Java SE 8\u306e\u65b0\u6a5f\u80fd\u306b\u3088\u3063\u3066\u3001\u4ee5\u4e0b\u306e\u5229\u70b9\u3092\u5f97\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u30e9\u30e0\u30c0\u5f0f\u306f\u3001\u4e00\u9023\u306e\u5165\u529b\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u53d7\u3051\u5165\u308c\u3001\u7d50\u679c\u3092\u8fd4\u3059\u533f\u540d\u95a2\u6570\u3067\u3059\u3002\u30e9\u30e0\u30c0\u5f0f\u306f\u540d\u524d\u3092\u6301\u305f\u305a\u3001\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u6709\u7121\u3001\u7d50\u679c\u306e\u6709\u7121\u306b\u95a2\u308f\u3089\u305a\u3001\u8981\u6c42\u3055\u308c\u305f\u6642\u306b\u30b3\u30fc\u30c9\u30d6\u30ed\u30c3\u30af\u304c\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002<\/p>\n
\u30e9\u30e0\u30c0\u5f0f\u306b\u306f3\u3064\u306e\u30d1\u30fc\u30c8\u304c\u542b\u307e\u308c\u3066\u3044\u307e\u3059\u3002 (Ramuda-shiki ni wa mitsu no p\u0101to ga fukumareteimasu.)<\/p>\n
\u300cJournal Dev\u300d\u306e\u30bf\u30a4\u30d7\u306fjava.lang.String\u3067\u3059\u3002\u300ctrue\u300d\u306e\u30bf\u30a4\u30d7\u306fBoolean\u3067\u3059\u3002\u540c\u69d8\u306b\u3001\u30e9\u30e0\u30c0\u5f0f\u306e\u30bf\u30a4\u30d7\u306f\u4f55\u3067\u3059\u304b\uff1f\u30e9\u30e0\u30c0\u5f0f\u306e\u30bf\u30a4\u30d7\u306fFunctional Interface\u3067\u3059\u3002\u4f8b\uff1a\u4ee5\u4e0b\u306e\u30e9\u30e0\u30c0\u5f0f\u306e\u30bf\u30a4\u30d7\u306f\u4f55\u3067\u3059\u304b\uff1f<\/p>\n
() -> System.out.println(\"Hello World\");\r\n<\/code><\/pre>\n\u3053\u306e\u30e9\u30e0\u30c0\u5f0f\u306f\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u6301\u305f\u305a\u3001\u7d50\u679c\u3082\u8fd4\u3055\u306a\u3044\u306e\u3067\u3001\u305d\u306e\u578b\u306f\u300cjava.lang.Runnable\u300d\u3068\u3044\u3046\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3067\u3059\u3002<\/p>\n
\u6a5f\u80fd\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3068\u306f\u4f55\u3067\u3059\u304b\uff1fSAM\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n
\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306f\u30011\u3064\u3060\u3051\u306e\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u3092\u542b\u3080\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3067\u3059\u3002\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306f\u30011\u3064\u3060\u3051\u306e\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u3092\u542b\u3080\u305f\u3081\u3001SAM\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3068\u3082\u547c\u3070\u308c\u307e\u3059\u3002SAM\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306f\u3001\u5358\u4e00\u306e\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u610f\u5473\u3057\u307e\u3059\u3002Java SE 8\u306eAPI\u306b\u306f\u3001\u591a\u304f\u306e\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u304c\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u81ea\u5206\u81ea\u8eab\u306e\u30d5\u30a1\u30f3\u30af\u30b7\u30e7\u30ca\u30eb\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u306f\u53ef\u80fd\u3067\u3059\u304b\uff1f @FunctionalInterface\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f\u30d5\u30a1\u30f3\u30af\u30b7\u30e7\u30ca\u30eb\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9a\u7fa9\u3059\u308b\u305f\u3081\u306e\u30eb\u30fc\u30eb\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n
\u306f\u3044\u3001\u81ea\u5206\u81ea\u8eab\u3067\u30d5\u30a1\u30f3\u30af\u30b7\u30e7\u30ca\u30eb\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002Java SE 8\u306e@FunctionalInterface\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3057\u3066\u3001\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u30d5\u30a1\u30f3\u30af\u30b7\u30e7\u30ca\u30eb\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3068\u3057\u3066\u30de\u30fc\u30af\u3057\u307e\u3059\u3002\u30d5\u30a1\u30f3\u30af\u30b7\u30e7\u30ca\u30eb\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9a\u7fa9\u3059\u308b\u305f\u3081\u306b\u306f\u3001\u6b21\u306e\u30eb\u30fc\u30eb\u306b\u5f93\u3046\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
\n- Define an interface with one and only one abstract method.<\/li>\n
- We cannot define more than one abstract method.<\/li>\n
- Use @FunctionalInterface annotation in interface definition.<\/li>\n
- We can define any number of other methods like Default methods, Static methods.<\/li>\n
- If we override java.lang.Object class\u2019s method as an abstract method, which does not count as an abstract method.<\/li>\n<\/ul>\n
\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9a\u7fa9\u3059\u308b\u305f\u3081\u306b\u306f\u3001@FunctionalInterface\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u306f\u5fc5\u9808\u3067\u3059\u304b\uff1f@FunctionalInterface\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u306e\u7528\u9014\u306f\u4f55\u3067\u3059\u304b\uff1f\u306a\u305cJava\u3067\u306f\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u304c\u5fc5\u8981\u306a\u306e\u3067\u3059\u304b\uff1f<\/h3>\n
@FunctionalInterface\u306e\u6ce8\u91c8\u3092\u4f7f\u7528\u3057\u3066\u3001Functional Interface\u3092\u5b9a\u7fa9\u3059\u308b\u5fc5\u8981\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u5e0c\u671b\u3057\u306a\u3044\u5834\u5408\u306f\u3001\u3053\u306e\u6ce8\u91c8\u3092\u7701\u7565\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u305f\u3060\u3057\u3001Functional Interface\u306e\u5b9a\u7fa9\u3067\u3053\u308c\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408\u3001Java\u30b3\u30f3\u30d1\u30a4\u30e9\u306f\u305d\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u5185\u30671\u3064\u3060\u3051\u306e\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3092\u5f37\u5236\u3057\u307e\u3059\u3002\u306a\u305cFunctional Interface\u304c\u5fc5\u8981\u306a\u306e\u3067\u3057\u3087\u3046\u304b\uff1fJava SE 8\u306eLambda\u5f0f\u306e\u578b\u306fFunctional Interface\u3067\u3059\u3002Lambda\u5f0f\u3092\u4f7f\u7528\u3059\u308b\u5834\u6240\u3067\u306f\u3001\u3064\u307e\u308aFunctional Interface\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002<\/p>\n
Java 8 \u306e Stream API \u3092\u4f7f\u3046\u30bf\u30a4\u30df\u30f3\u30b0\u306f\u3044\u3064\u3067\u3059\u304b\uff1f\u306a\u305c Java 8 \u306e Stream API \u3092\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u4f7f\u7528\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u306e\u3067\u3057\u3087\u3046\u304b\uff1f<\/h3>\n
\u79c1\u305f\u3061\u306eJava\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u304c\u6b21\u306e\u64cd\u4f5c\u3092\u884c\u3044\u305f\u3044\u5834\u5408\u3001Java 8 Stream API\u3092\u4f7f\u7528\u3059\u308b\u65b9\u304c\u591a\u304f\u306e\u5229\u70b9\u304c\u5f97\u3089\u308c\u307e\u3059\u3002<\/p>\n
\n- When we want perform Database like Operations. For instance, we want perform groupby operation, orderby operation etc.<\/li>\n
- When want to Perform operations Lazily.<\/li>\n
- When we want to write Functional Style programming.<\/li>\n
- When we want to perform Parallel Operations.<\/li>\n
- When want to use Internal Iteration<\/li>\n
- When we want to perform Pipelining operations.<\/li>\n
- When we want to achieve better performance.<\/li>\n<\/ul>\n
\u30b3\u30ec\u30af\u30b7\u30e7\u30f3API\u3068\u30b9\u30c8\u30ea\u30fc\u30e0API\u306e\u9055\u3044\u3092\u8aac\u660e\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/h3>\n\n\n\n\n\nS.No<\/a>.<\/th>\n Collection API<\/th>\n Stream API<\/th>\n<\/tr>\n<\/thead>\n \n\n1.<\/td>\n It\u2019s available since Java 1.2<\/td>\n It is introduced in Java SE 8<\/td>\n<\/tr>\n \n2.<\/td>\n It is used to store Data (A set of Objects).<\/td>\n It is used to compute data (Computation on a set of Objects).<\/td>\n<\/tr>\n \n3.<\/td>\n We can use both Spliterator and Iterator to iterate elements. We can use forEach<\/a> to performs an action for each element of this stream.<\/td>\n We can\u2019t use Spliterator or Iterator to iterate elements.<\/td>\n<\/tr>\n \n4.<\/td>\n It is used to store unlimited number of elements.<\/td>\n Stream API is used to process on the elements of a Collection.<\/td>\n<\/tr>\n \n5.<\/td>\n Typically, it uses External Iteration concept to iterate Elements such as Iterator.<\/td>\n Stream API uses internal iteration to iterate Elements, using forEach methods.<\/td>\n<\/tr>\n \n6.<\/td>\n Collection Object is constructed Eagerly.<\/td>\n Stream Object is constructed Lazily.<\/td>\n<\/tr>\n \n7.<\/td>\n We add elements to Collection object only after it is computed completely.<\/td>\n We can add elements to Stream Object without any prior computation. That means Stream objects are computed on-demand.<\/td>\n<\/tr>\n \n8.<\/td>\n We can iterate and consume elements from a Collection Object at any number of times.<\/td>\n We can iterate and consume elements from a Stream Object only once.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\nJava SE 8\u306b\u304a\u3051\u308bSpliterator\u3068\u306f\u4f55\u3067\u3059\u304b\uff1fIterator\u3068Spliterator\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n
Spliterator\u306f\u3001Splitable Iterator\u306e\u7565\u3067\u3059\u3002\u30aa\u30e9\u30af\u30eb\u30b3\u30fc\u30dd\u30ec\u30fc\u30b7\u30e7\u30f3\u306b\u3088\u3063\u3066Java SE 8\u306e\u4e00\u90e8\u3068\u3057\u3066\u65b0\u305f\u306b\u5c0e\u5165\u3055\u308c\u307e\u3057\u305f\u3002Iterator\u3084ListIterator\u3068\u540c\u69d8\u306b\u3001Iterator\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u4e00\u3064\u3067\u3059\u3002<\/p>\n
\n\n\n\n\nS.No<\/a>.<\/th>\n Spliterator<\/th>\n Iterator<\/th>\n<\/tr>\n<\/thead>\n \n\n1.<\/td>\n It is introduced in Java SE 8.<\/td>\n It is available since Java 1.2.<\/td>\n<\/tr>\n \n2.<\/td>\n Splitable Iterator<\/td>\n Non-Splitable Iterator<\/td>\n<\/tr>\n \n3.<\/td>\n It is used in Stream API.<\/td>\n It is used for Collection API.<\/td>\n<\/tr>\n \n4.<\/td>\n It uses Internal Iteration concept to iterate Streams.<\/td>\n It uses External Iteration concept to iterate Collections.<\/td>\n<\/tr>\n \n5.<\/td>\n We can use Spliterator to iterate Streams in Parallel and Sequential order.<\/td>\n We can use Iterator to iterate Collections only in Sequential order.<\/td>\n<\/tr>\n \n6.<\/td>\n We can get Spliterator by calling spliterator() method on Stream Object.<\/td>\n We can get Iterator by calling iterator() method on Collection Object.<\/td>\n<\/tr>\n \n7.<\/td>\n Important Method: tryAdvance()<\/td>\n Important Methods: next(), hasNext()<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\nJava 8\u3067\u306eOptional\u3068\u306f\u4f55\u3067\u3059\u304b\uff1fOptional\u306e\u4f7f\u7528\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\uff1fJava 8 Optional\u306e\u5229\u70b9\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n
\u30aa\u30d7\u30b7\u30e7\u30ca\u30eb\uff1a\u30aa\u30d7\u30b7\u30e7\u30ca\u30eb\u306f\u3001Java SE 8\u306e\u4e00\u90e8\u3068\u3057\u3066\u5c0e\u5165\u3055\u308c\u305f\u30d5\u30a1\u30a4\u30ca\u30eb\u30af\u30e9\u30b9\u3067\u3059\u3002java.util\u30d1\u30c3\u30b1\u30fc\u30b8\u3067\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u5b58\u5728\u3059\u308b\u304b\u5b58\u5728\u3057\u306a\u3044\u304b\u306e\u30aa\u30d7\u30b7\u30e7\u30ca\u30eb\u306a\u5024\u3092\u8868\u3059\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u5024\u30921\u3064\u3060\u3051\u542b\u3080\u304b\u30010\u3064\u3060\u3051\u3092\u542b\u3080\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u5024\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u5834\u5408\u3001\u305d\u308c\u3092\u53d6\u5f97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u305d\u308c\u4ee5\u5916\u306e\u5834\u5408\u306f\u4f55\u3082\u53d6\u5f97\u3067\u304d\u307e\u305b\u3093\u3002\u6700\u5927\u30671\u3064\u306e\u8981\u7d20\u3057\u304b\u542b\u307e\u308c\u306a\u3044\u30d0\u30a6\u30f3\u30c9\u3055\u308c\u305f\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3067\u3059\u3002\u305d\u308c\u306f\u300cnull\u300d\u5024\u306e\u4ee3\u66ff\u3067\u3059\u3002\u30aa\u30d7\u30b7\u30e7\u30ca\u30eb\u306e\u4e3b\u306a\u5229\u70b9\u306f\uff1a<\/p>\n
\n- It is used to avoid null checks.<\/li>\n
- It is used to avoid \u201cNullPointerException\u201d.<\/li>\n<\/ul>\n
\u578b\u63a8\u8ad6\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f\u578b\u63a8\u8ad6\u306f\u3001Java 7\u3084\u305d\u308c\u4ee5\u524d\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u3067\u3082\u5229\u7528\u3067\u304d\u307e\u3059\u304b\u3001\u305d\u308c\u3068\u3082Java SE 8\u3067\u306e\u307f\u5229\u7528\u3067\u304d\u307e\u3059\u304b\uff1f<\/h3>\n
\u578b\u63a8\u8ad6\u3068\u306f\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u30b3\u30f3\u30d1\u30a4\u30e9\u304c\u578b\u3092\u6c7a\u5b9a\u3059\u308b\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002\u3053\u308c\u306fJava SE 8\u3067\u65b0\u3057\u3044\u6a5f\u80fd\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002Java 7\u3067\u306f\u5229\u7528\u3067\u304d\u3001Java 7\u3088\u308a\u3082\u524d\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u3067\u3082\u5229\u7528\u3067\u304d\u307e\u3057\u305f\u3002Java 7\u3088\u308a\u3082\u524d\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u3067\u306f\u3001Java\u306e\u914d\u5217\u3092\u63a2\u7d22\u3057\u307e\u3057\u3087\u3046\u3002\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u5024\u3092\u6301\u3064String\u306e\u914d\u5217\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002<\/p>\n
String str[] = { \"Java 7\", \"Java 8\", \"Java 9\" };\r\n<\/code><\/pre>\n\u3053\u3053\u3067\u306f\u3001\u53f3\u5074\u306b\u3044\u304f\u3064\u304b\u306e\u6587\u5b57\u5217\u306e\u5024\u304c\u5272\u308a\u5f53\u3066\u3089\u308c\u3066\u3044\u307e\u3059\u304c\u3001\u305d\u306e\u578b\u304c\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u307e\u305b\u3093\u3002Java\u30b3\u30f3\u30d1\u30a4\u30e9\u306f\u81ea\u52d5\u7684\u306b\u305d\u306e\u578b\u3092\u63a8\u8ad6\u3057\u3001\u6587\u5b57\u5217\u306e\u914d\u5217\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002Java 7\uff1aOracle Corporation\u306fJava SE 7\u3067\u300c\u30c0\u30a4\u30e4\u30e2\u30f3\u30c9\u30aa\u30da\u30ec\u30fc\u30bf\u30fc\u300d\u3068\u3044\u3046\u65b0\u3057\u3044\u6a5f\u80fd\u3092\u5c0e\u5165\u3057\u307e\u3057\u305f\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30b8\u30a7\u30cd\u30ea\u30af\u30b9\u3067\u4e0d\u8981\u306a\u578b\u5b9a\u7fa9\u3092\u56de\u907f\u3067\u304d\u307e\u3059\u3002<\/p>\n
Map<String,List<Customer>> customerInfoByCity = new HashMap<>();\r\n<\/code><\/pre>\n\u3053\u3053\u3067\u306f\u3001\u53f3\u5074\u3067\u306e\u578b\u60c5\u5831\u306f\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u307e\u305b\u3093\u304c\u3001\u305f\u3060\u5358\u306bJava SE 7\u306e\u30c0\u30a4\u30e4\u30e2\u30f3\u30c9\u30aa\u30da\u30ec\u30fc\u30bf\u30fc\u304c\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u307e\u3059\u3002Java SE 8\u3067\u306f\u3001Oracle Corporation\u304c\u3053\u306e\u578b\u63a8\u8ad6\u306e\u6982\u5ff5\u3092\u5927\u5e45\u306b\u5f37\u5316\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u6982\u5ff5\u3092\u4f7f\u3063\u3066\u3001\u30e9\u30e0\u30c0\u5f0f\u3001\u95a2\u6570\u3001\u30e1\u30bd\u30c3\u30c9\u53c2\u7167\u306a\u3069\u3092\u5b9a\u7fa9\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
ToIntBiFunction<Integer,Integer> add = (a,b) -> a + b;\r\n<\/code><\/pre>\n\u4ee5\u4e0b\u306eJava\u30b3\u30f3\u30d1\u30a4\u30e9\u306f\u3001\u5de6\u5074\u3067\u5229\u7528\u53ef\u80fd\u306a\u578b\u5b9a\u7fa9\u3092\u898b\u3066\u3001Lambda\u5f0f\u306e\u30d1\u30e9\u30e1\u30fc\u30bfa\u3068b\u306e\u578b\u3092Integer\u3068\u3057\u3066\u6c7a\u5b9a\u3057\u307e\u3059\u3002\u3053\u308c\u304cJava 8\u306e\u30a4\u30f3\u30bf\u30d3\u30e5\u30fc\u306e\u8cea\u554f\u3067\u3059\u3002\u3053\u306e\u6295\u7a3f\u3067\u3044\u304f\u3064\u304b\u306eJava SE 8\u306e\u30a4\u30f3\u30bf\u30d3\u30e5\u30fc\u306e\u8cea\u554f\u306b\u3064\u3044\u3066\u8a71\u3057\u307e\u3057\u305f\u304c\u3001\u4eca\u5f8c\u306e\u6295\u7a3f\u3067\u3055\u3089\u306b\u3044\u304f\u3064\u304b\u306eJava SE 8\u306e\u30a4\u30f3\u30bf\u30d3\u30e5\u30fc\u306e\u8cea\u554f\u306b\u3064\u3044\u3066\u8a71\u3057\u307e\u3059\u3002\u79c1\u306e\u6295\u7a3f\u304c\u6c17\u306b\u5165\u3063\u305f\u308a\u3001\u554f\u984c\u3084\u63d0\u6848\u304c\u3042\u308c\u3070\u30b3\u30e1\u30f3\u30c8\u3092\u6b8b\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u3053\u306e\u6295\u7a3f\u3067\u306f\u3001\u91cd\u8981\u306aJava SE 8\u306e\u30a4\u30f3\u30bf\u30d3\u30e5\u30fc\u306e\u8cea\u554f\u3068\u56de\u7b54\u306b\u3064\u3044\u3066\u8a71\u3057\u5408\u3044\u307e\u3059\u3002\u79c1\u306f\u3082\u30461\u3064\u306e\u6295\u7a3f\u3092\u66f8\u3044\u3066\u3001\u6b8b\u308a\u306eJava SE 8\u306e\u30a4\u30f3\u30bf\u30d3\u30e5\u30fc\u306e\u8cea\u554f\u306b\u3064\u3044\u3066\u8a71\u3057\u5408\u3044\u307e\u3059\u3002 Java 8 \u30a4\u30f3\u30bf\u30d3\u30e5\u30fc\u306e\u8cea\u554f \u306a\u305c […]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-828","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"yoast_head":"\n
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