{"id":591,"date":"2023-05-17T06:49:10","date_gmt":"2022-09-03T13:16:45","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/java-se-8%e3%81%ae%e9%9d%a2%e6%8e%a5%e8%b3%aa%e5%95%8f%e3%81%a8%e5%9b%9e%e7%ad%94%ef%bc%88%e3%83%91%e3%83%bc%e3%83%882%ef%bc%89\/"},"modified":"2025-08-01T00:52:55","modified_gmt":"2025-07-31T15:52:55","slug":"java-se-8%e3%81%ae%e9%9d%a2%e6%8e%a5%e8%b3%aa%e5%95%8f%e3%81%a8%e5%9b%9e%e7%ad%94%ef%bc%88%e3%83%91%e3%83%bc%e3%83%882%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java-se-8%e3%81%ae%e9%9d%a2%e6%8e%a5%e8%b3%aa%e5%95%8f%e3%81%a8%e5%9b%9e%e7%ad%94%ef%bc%88%e3%83%91%e3%83%bc%e3%83%882%ef%bc%89\/","title":{"rendered":"Java SE 8\u306e\u9762\u63a5\u8cea\u554f\u3068\u56de\u7b54\uff08\u30d1\u30fc\u30c82\uff09"},"content":{"rendered":"

\u4ee5\u524d\u306e\u6295\u7a3f\u3067\u306f\u3001\u91cd\u8981\u306aJava SE 8\u306e\u9762\u63a5\u306e\u8cea\u554f\u3068\u56de\u7b54\u306b\u3064\u3044\u3066\u8a71\u3057\u307e\u3057\u305f\u3002\u3053\u306e\u6295\u7a3f\u3067\u306f\u3001\u3055\u3089\u306bJava SE 8\u306e\u9762\u63a5\u306e\u8cea\u554f\u3068\u56de\u7b54\u306b\u3064\u3044\u3066\u8b70\u8ad6\u3057\u307e\u3059\u3002\u3053\u306e\u6295\u7a3f\u3092\u8aad\u3080\u524d\u306b\u3001\u4ee5\u4e0b\u306eURL\u304b\u3089\u79c1\u306e\u4ee5\u524d\u306e\u6295\u7a3f\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\uff1a\u300cJava SE 8\u9762\u63a5\u306e\u8cea\u554f\uff08\u30d1\u30fc\u30c81\uff09\u300d\u3002<\/p>\n

Java SE 8\u306e\u30a4\u30f3\u30bf\u30d3\u30e5\u30fc\u8cea\u554f<\/h3>\n
    \n
  1. \n
      Java SE 8\u306b\u304a\u3051\u308bInternal Iteration\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f<\/ol>\n<\/li>\n<\/ol>\n

       <\/p>\n

        \n
      1. \n
          External Iteration\u3068Internal Iteration\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f<\/ol>\n<\/li>\n<\/ol>\n

           <\/p>\n

            \n
          1. \n
              External Iteration\u306e\u4e3b\u306a\u6b20\u70b9\u306f\u4f55\u3067\u3059\u304b\uff1f<\/ol>\n<\/li>\n<\/ol>\n

               <\/p>\n

                \n
              1. \n
                  Internal Iteration\u304cExternal Iteration\u306b\u6bd4\u3079\u3066\u6301\u3064\u4e3b\u306a\u5229\u70b9\u306f\u4f55\u3067\u3059\u304b\uff1f<\/ol>\n<\/li>\n<\/ol>\n

                   <\/p>\n

                    \n
                  1. \n
                      Internal Iteration\u304cExternal Iteration\u306b\u6bd4\u3079\u3066\u6301\u3064\u4e3b\u306a\u6b20\u70b9\u306f\u4f55\u3067\u3059\u304b\uff1f<\/ol>\n<\/li>\n<\/ol>\n

                       <\/p>\n

                        \n
                      1. \n
                          External Iteration\u304cInternal Iteration\u306b\u6bd4\u3079\u3066\u6301\u3064\u4e3b\u306a\u5229\u70b9\u306f\u4f55\u3067\u3059\u304b\uff1f<\/ol>\n<\/li>\n<\/ol>\n

                           <\/p>\n

                            \n
                          1. \n
                              \u3044\u3064Internal Iteration\u3092\u4f7f\u7528\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u304b\uff1f\u3044\u3064External Iteration\u3092\u4f7f\u7528\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u304b\uff1f<\/ol>\n<\/li>\n<\/ol>\n

                               <\/p>\n

                                \n
                              1. \n
                                  Java 8\u306eStream API\u306eIntermediate Operations\u3068Terminal Operations\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f<\/ol>\n<\/li>\n<\/ol>\n

                                   <\/p>\n

                                    \n
                                  1. \n
                                      Java\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306b\u30e1\u30bd\u30c3\u30c9\u306e\u5b9f\u88c5\u3092\u63d0\u4f9b\u3059\u308b\u3053\u3068\u306f\u53ef\u80fd\u3067\u3059\u304b\uff1f\u53ef\u80fd\u306a\u5834\u5408\u3001\u3069\u306e\u3088\u3046\u306b\u63d0\u4f9b\u3057\u307e\u3059\u304b\uff1f<\/ol>\n<\/li>\n<\/ol>\n

                                       <\/p>\n

                                        \n
                                      1. \n
                                          \u30c7\u30d5\u30a9\u30eb\u30c8\u30e1\u30bd\u30c3\u30c9\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f\u306a\u305cJava 8\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3067\u30c7\u30d5\u30a9\u30eb\u30c8\u30e1\u30bd\u30c3\u30c9\u304c\u5fc5\u8981\u306a\u306e\u3067\u3059\u304b\uff1f<\/ol>\n<\/li>\n<\/ol>\n

                                           <\/p>\n

                                            \n
                                          1. \n
                                              \u30b9\u30bf\u30c6\u30a3\u30c3\u30af\u30e1\u30bd\u30c3\u30c9\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f\u306a\u305cJava 8\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3067\u30b9\u30bf\u30c6\u30a3\u30c3\u30af\u30e1\u30bd\u30c3\u30c9\u304c\u5fc5\u8981\u306a\u306e\u3067\u3059\u304b\uff1f<\/ol>\n<\/li>\n<\/ol>\n

                                               <\/p>\n

                                                \n
                                              1. \n
                                                  \u95a2\u6570\u578b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3068\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f<\/ol>\n<\/li>\n<\/ol>\n

                                                   <\/p>\n

                                                    \n
                                                  1. \n
                                                      \u53e4\u3044Java Date API\u306e\u554f\u984c\u3092\u8aac\u660e\u3057\u3066\u304f\u3060\u3055\u3044\u3002Java 8\u306eDate and Time API\u3068Joda Time API\u306b\u6bd4\u3079\u3066Java 8\u306eDate and Time API\u306e\u5229\u70b9\u306f\u4f55\u3067\u3059\u304b\uff1f<\/ol>\n<\/li>\n<\/ol>\n

                                                       <\/p>\n

                                                        \n
                                                      1. \n
                                                          Java SE 8\u3067\u306a\u305c\u65b0\u3057\u3044Date and Time API\u304c\u5fc5\u8981\u306a\u306e\u3067\u3059\u304b\uff1fJava SE 8\u306eDate and Time API\u306f\u53e4\u3044Java Date API\u306e\u554f\u984c\u3092\u3069\u306e\u3088\u3046\u306b\u89e3\u6c7a\u3057\u307e\u3059\u304b\uff1f<\/ol>\n<\/li>\n<\/ol>\n

                                                           <\/p>\n

                                                            \n
                                                          1. \n
                                                              Java\u306e\u53e4\u3044Java Date API\u3068Java 8\u306eDate and Time API\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f<\/ol>\n<\/li>\n<\/ol>\n

                                                               <\/p>\n

                                                                \n
                                                              1. \n
                                                                  \u591a\u91cd\u7d99\u627f\u3068\u306f\u4f55\u3067\u3059\u304b\uff1fJava 8\u306f\u3069\u306e\u3088\u3046\u306b\u3057\u3066\u591a\u91cd\u7d99\u627f\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u307e\u3059\u304b\uff1f<\/ol>\n<\/li>\n<\/ol>\n

                                                                   <\/p>\n

                                                                    \u30c7\u30d5\u30a9\u30eb\u30c8\u30e1\u30bd\u30c3\u30c9\u306b\u3088\u308b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u30c0\u30a4\u30e4\u30e2\u30f3\u30c9\u554f\u984c\u3068\u306f\u4f55\u3067\u3059\u304b\uff1fJava 8\u306f\u3053\u306e\u554f\u984c\u3092\u3069\u306e\u3088\u3046\u306b\u89e3\u6c7a\u3057\u307e\u3059\u304b\uff1f<\/ol>\n

                                                                    Java SE 8 \u306e \u30a4\u30f3\u30bf\u30d3\u30e5\u30fc\u306e \u8cea\u554f\u3068\u56de\u7b54<\/h3>\n

                                                                    Java SE 8\u306b\u304a\u3051\u308b\u5185\u90e8\u53cd\u5fa9\u51e6\u7406\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n

                                                                    Java 8\u4ee5\u524d\u306f\u3001\u79c1\u305f\u3061\u306f\u5185\u90e8\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u6982\u5ff5\u3092\u6301\u3063\u3066\u3044\u307e\u305b\u3093\u3067\u3057\u305f\u3002Java 8\u3067\u306f\u3001\u300c\u5185\u90e8\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\u300d\u3068\u3044\u3046\u65b0\u6a5f\u80fd\u304c\u5c0e\u5165\u3055\u308c\u307e\u3057\u305f\u3002Java 8\u4ee5\u524d\u3001Java\u8a00\u8a9e\u3067\u306f\u3001\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3084\u914d\u5217\u306a\u3069\u306e\u96c6\u7d04\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u8981\u7d20\u3092\u53cd\u5fa9\u3059\u308b\u305f\u3081\u306b\u5916\u90e8\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u307f\u304c\u5b58\u5728\u3057\u307e\u3057\u305f\u3002\u5185\u90e8\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\u3068\u306f\u3001\u300cJava API\u306b\u3088\u3063\u3066\u5185\u90e8\u7684\u306b\u96c6\u7d04\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u8981\u7d20\u3092\u4e00\u3064\u305a\u3064\u53cd\u5fa9\u3059\u308b\u3053\u3068\u300d\u3092\u610f\u5473\u3057\u307e\u3059\u3002Java\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u304c\u5916\u90e8\u7684\u306b\u53cd\u5fa9\u3059\u308b\u306e\u3067\u306f\u306a\u304f\u3001Java API\u306b\u3053\u306e\u30b8\u30e7\u30d6\u3092\u5185\u90e8\u7684\u306b\u884c\u3063\u3066\u3082\u3089\u3046\u306e\u3067\u3059\u3002<\/p>\n

                                                                    \u5916\u90e8\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\u3068\u5185\u90e8\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f (Gaihatsu iter\u0113shon to naihatsu iter\u0113shon no chigai wa nan desu ka?)<\/h3>\n
                                                                    \n
                                                                    \n\n\n\n\n\n\n\n\n\n\n\n
                                                                    S.No<\/a>.<\/th>\nExternal Iteration<\/th>\nInternal Iteration<\/th>\n<\/tr>\n<\/thead>\n
                                                                    1.<\/td>\nAvailable before Java 8 too.<\/td>\nIt is introduced in Java SE 8<\/td>\n<\/tr>\n
                                                                    2.<\/td>\nIterating an Aggregated Object elements externally.<\/td>\nIterating an Aggregated Object elements internally (background).<\/td>\n<\/tr>\n
                                                                    3.<\/td>\nIterate elements by using for-each loop and Iterators like Enumeration, Iterator, ListIterator.<\/td>\nIterate elements by using Java API like \u201cforEach\u201d method.<\/td>\n<\/tr>\n
                                                                    4.<\/td>\nIterating elements in Sequential and In-Order only.<\/td>\nNot required to iterate elements in Sequential order.<\/td>\n<\/tr>\n
                                                                    5.<\/td>\nIt follows OOP approach that is Imperative Style.<\/td>\nIt follows Functional Programming approach that is Declarative Style.<\/td>\n<\/tr>\n
                                                                    6.<\/td>\nIt does NOT separate responsibilities properly that is, it defines both \u201cWhat is to be done\u201d and \u201cHow it is to be done\u201d.<\/td>\nIt defines only \u201cWhat is to be done\u201d. No need to worry about \u201cHow it is to be done\u201d. Java API takes care about \u201cHow to do\u201d.<\/td>\n<\/tr>\n
                                                                    7.<\/td>\nLess Readable Code.<\/td>\nMore Readable code.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

                                                                    \u5916\u90e8\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u4e3b\u306a\u6b20\u70b9\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n

                                                                    \u5916\u90e8\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\u306b\u306f\u4ee5\u4e0b\u306e\u6b20\u70b9\u304c\u3042\u308a\u307e\u3059:<\/p>\n

                                                                      \n
                                                                    • We need to write code in Imperative Style.<\/li>\n
                                                                    • There is no clear separation of Responsibilities. Tightly-Coupling between \u201cWhat is to be done\u201d and \u201cHow it is to be done\u201d code.<\/li>\n
                                                                    • Less Readable Code.<\/li>\n
                                                                    • More Verbose and Boilerplate code.<\/li>\n
                                                                    • We have to iterate elements in Sequential order only.<\/li>\n
                                                                    • It does not support Concurrency and Parallelism properly.<\/li>\n<\/ul>\n

                                                                      \u5185\u90e8\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u4e3b\u306a\u5229\u70b9\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n

                                                                      \u5916\u90e8\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\u306b\u6bd4\u3079\u308b\u3068\u3001\u5185\u90e8\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\u306b\u306f\u4ee5\u4e0b\u306e\u5229\u70b9\u304c\u3042\u308a\u307e\u3059:<\/p>\n

                                                                        \n
                                                                      • As it follows Functional Programming style, we can write Declarative Code.<\/li>\n
                                                                      • More Readable and concise code.<\/li>\n
                                                                      • Avoids writing Verbose and Boilerplate code<\/li>\n
                                                                      • No need to iterate elements in Sequential order.<\/li>\n
                                                                      • It supports Concurrency and Parallelism properly.<\/li>\n
                                                                      • We can write Parallel code to improve application performance.<\/li>\n
                                                                      • Clear separation of Responsibilities. Loosely-Coupling between \u201cWhat is to be done\u201d and \u201cHow it is to be done\u201d code.<\/li>\n
                                                                      • We need to write code only about \u201cWhat is to be done\u201d and Java API takes care about \u201cHow it is to be done\u201d code.<\/li>\n<\/ul>\n

                                                                        \u5185\u90e8\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u4e3b\u306a\u6b20\u70b9\u306f\u4f55\u3067\u3059\u304b\uff1f (Naibu itere\u0304shon no hon’na ketten wa nanidesu ka?)<\/h3>\n

                                                                        \u5916\u90e8\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\u306b\u6bd4\u3079\u3066\u3001\u5185\u90e8\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\u306b\u306f\u4e3b\u306a\u6b20\u70b9\u304c\u4e00\u3064\u3042\u308a\u307e\u3059\u3002<\/p>\n

                                                                          \n
                                                                        • In Internal Iteration, as Java API takes care about Iterating elements internally, we do NOT have control over Iteration.<\/li>\n<\/ul>\n

                                                                          \u5916\u90e8\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u4e3b\u306a\u5229\u70b9\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n

                                                                          \u5185\u90e8\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\u306b\u6bd4\u3079\u3066\u3001\u5916\u90e8\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\u306f1\u3064\u306e\u4e3b\u8981\u306a\u5229\u70b9\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

                                                                            \n
                                                                          • In External Iteration, as Java API does NOT take care about Iterating elements, we have much control over Iteration.<\/li>\n<\/ul>\n

                                                                            \u3044\u3064\u5185\u90e8\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u304b\uff1f\u3044\u3064\u5916\u90e8\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u304b\uff1f (Itsu naibu itere\u0304shon o shiyo suru hitsuy\u014d ga arimasu ka? Itsu gaibu itere\u0304shon o shiyo suru hitsuy\u014d ga arimasu ka?)<\/h3>\n

                                                                            \u5185\u90e8\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\u307e\u305f\u306f\u5916\u90e8\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3059\u308b\u72b6\u6cc1\u3092\u7406\u89e3\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

                                                                              \n
                                                                            • When we need more control over Iteration, we can use External Iteration.<\/li>\n
                                                                            • When we do NOT need more control over Iteration, we can use Internal Iteration.<\/li>\n
                                                                            • When we need to develop Highly Concurrency and Parallel applications and we , we should use Internal Iteration.<\/li>\n<\/ul>\n

                                                                              Java 8\u306eStream API\u306e\u4e2d\u9593\u64cd\u4f5c\u3068\u7d42\u7aef\u64cd\u4f5c\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n
                                                                              \n
                                                                              \n\n\n\n\n\n\n\n\n\n
                                                                              S.No<\/a>.<\/th>\nStream Intermediate Operations<\/th>\nStream Terminal Operations<\/th>\n<\/tr>\n<\/thead>\n
                                                                              1.<\/td>\nStream Intermediate operations are not evaluated until we chain it with Stream Terminal Operation.<\/td>\nStream Terminal Operations are evaluated on it\u2019s own. No need other operations help.<\/td>\n<\/tr>\n
                                                                              2.<\/td>\nThe output of Intermediate Operations is another Stream.<\/td>\nThe output of Intermediate Operations is Not a Stream. Something else other than a Stream.<\/td>\n<\/tr>\n
                                                                              3.<\/td>\nIntermediate Operations are evaluated Lazily.<\/td>\nTerminal Operations are evaluated Eagerly.<\/td>\n<\/tr>\n
                                                                              4.<\/td>\nWe can chain any number of Stream Intermediate Operations.<\/td>\nWe can NOT chain Stream Terminal Operations.<\/td>\n<\/tr>\n
                                                                              5.<\/td>\nWe can use any number of Stream Intermediate Operations per Statement.<\/td>\nWe can use only one Stream Terminal Operation per Statement.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

                                                                              Java\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3067\u30e1\u30bd\u30c3\u30c9\u306e\u5b9f\u88c5\u3092\u63d0\u4f9b\u3059\u308b\u3053\u3068\u306f\u53ef\u80fd\u3067\u3059\u304b\uff1f\u53ef\u80fd\u306a\u5834\u5408\u3001\u3069\u306e\u3088\u3046\u306b\u63d0\u4f9b\u3057\u307e\u3059\u304b\uff1f<\/h3>\n

                                                                              \u4ee5\u4e0b\u306f\u3001Java 7\u4ee5\u524d\u3067\u306f\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u30e1\u30bd\u30c3\u30c9\u306e\u5b9f\u88c5\u3092\u63d0\u4f9b\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u305b\u3093\u3067\u3057\u305f\u3002\u3057\u304b\u3057\u3001Java 8\u4ee5\u964d\u3067\u306f\u53ef\u80fd\u306b\u306a\u308a\u307e\u3057\u305f\u3002Java SE 8\u3067\u306f\u3001\u6b21\u306e2\u3064\u306e\u65b0\u3057\u3044\u6982\u5ff5\u3092\u4f7f\u7528\u3057\u3066\u3001\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u5185\u3067\u30e1\u30bd\u30c3\u30c9\u306e\u5b9f\u88c5\u3092\u63d0\u4f9b\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n

                                                                                \n
                                                                              • Default Methods<\/li>\n
                                                                              • Static Methods<\/li>\n<\/ul>\n

                                                                                \u30c7\u30d5\u30a9\u30eb\u30c8\u30e1\u30bd\u30c3\u30c9\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f\u306a\u305cJava 8\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306b\u30c7\u30d5\u30a9\u30eb\u30c8\u30e1\u30bd\u30c3\u30c9\u304c\u5fc5\u8981\u306a\u306e\u3067\u3059\u304b\uff1f<\/h3>\n

                                                                                \u30c7\u30d5\u30a9\u30eb\u30c8\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u300cdefault\u300d\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u3066\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306b\u5b9f\u88c5\u3055\u308c\u308b\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002\u3053\u308c\u306fJava SE 8\u3067\u5c0e\u5165\u3055\u308c\u305f\u65b0\u6a5f\u80fd\u3067\u3059\u3002\u30c7\u30d5\u30a9\u30eb\u30c8\u30e1\u30bd\u30c3\u30c9\u304c\u5fc5\u8981\u306a\u7406\u7531\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n

                                                                                  \n
                                                                                • It allow us to provide method\u2019s implementation in Interfaces.<\/li>\n
                                                                                • To add new Functionality to Interface without breaking the Classes which implement that Interface.<\/li>\n
                                                                                • To provide elegant Backwards Compatibility Feature.<\/li>\n
                                                                                • To ease of extend the existing Functionality.<\/li>\n
                                                                                • To ease of Maintain the existing Functionality.<\/li>\n<\/ul>\n

                                                                                  \u300cStatic Method\u300d\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f\u306a\u305cJava 8\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3067\u306fStatic\u30e1\u30bd\u30c3\u30c9\u304c\u5fc5\u8981\u3067\u3059\u304b\uff1f<\/h3>\n

                                                                                  \u9759\u7684\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u30af\u30e9\u30b9\uff08\u307e\u305f\u306f\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\uff09\u306b\u95a2\u9023\u4ed8\u3051\u3089\u308c\u305f\u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3\u30e1\u30bd\u30c3\u30c9\u307e\u305f\u306f\u30d8\u30eb\u30d1\u30fc\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u95a2\u9023\u4ed8\u3051\u3089\u308c\u3066\u3044\u308b\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u6b21\u306e\u7406\u7531\u304b\u3089\u3001\u9759\u7684\u30e1\u30bd\u30c3\u30c9\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n

                                                                                    \n
                                                                                  • We can keep Helper or Utility methods specific to an interface in the same interface rather than in a separate Utility class.<\/li>\n
                                                                                  • We do not need separate Utility Classes like Collections, Arrays etc to keep Utility methods.<\/li>\n
                                                                                  • Clear separation of Responsibilities. That is we do not need one Utility class to keep all Utility methods of Collection API like Collections etc.<\/li>\n
                                                                                  • Easy to extend the API.<\/li>\n
                                                                                  • Easy to Maintain the API.<\/li>\n<\/ul>\n

                                                                                    \u95a2\u6570\u578b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3068\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n
                                                                                    \n
                                                                                    \n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
                                                                                    Functional Programming<\/th>\nOOP<\/th>\n<\/tr>\n<\/thead>\n
                                                                                    Does not exist State<\/td>\nExists State<\/td>\n<\/tr>\n
                                                                                    Uses Immutable data<\/td>\nUses Mutable data<\/td>\n<\/tr>\n
                                                                                    It follows Declarative Programming Model<\/td>\nIt follows Imperative Programming Model<\/td>\n<\/tr>\n
                                                                                    Stateless Programming Model<\/td>\nStateful Programming Model<\/td>\n<\/tr>\n
                                                                                    Main Fcous on: \u201cWhat you are doing\u201d<\/td>\nMain focus on \u201cHow you are doing\u201d<\/td>\n<\/tr>\n
                                                                                    Good for Parallel (Concurrency) Programming<\/td>\nPoor for Parallel (Concurrency) Programming<\/td>\n<\/tr>\n
                                                                                    Good for BigData processing and analysis<\/td>\nNOT Good for BigData processing and analysis<\/td>\n<\/tr>\n
                                                                                    Supports pure Encapsulation<\/td>\nIt breaks Encapsulation concept<\/td>\n<\/tr>\n
                                                                                    Functions with No-Side Effects<\/td>\nMethods with Side Effects<\/td>\n<\/tr>\n
                                                                                    Functions are first-class citizens<\/td>\nObjects are first-class citizens<\/td>\n<\/tr>\n
                                                                                    Primary Manipulation Unit is \u201cFunction\u201d<\/td>\nPrimary Manipulation Unit is Objects(Instances of Classes)<\/td>\n<\/tr>\n
                                                                                    Flow Controls: Function calls, Function Calls with Recursion<\/td>\nFlow Controls: Loops, Conditional Statements<\/td>\n<\/tr>\n
                                                                                    It uses \u201cRecursion\u201d concept to iterate Collection Data.<\/td>\nIt uses \u201cLoop\u201d concept to iterate Collection Data. For example:-For-each loop in Java<\/td>\n<\/tr>\n
                                                                                    Order of execution is less importance.<\/td>\nOrder of execution is must and very important.<\/td>\n<\/tr>\n
                                                                                    Supports both \u201cAbstraction over Data\u201d and \u201cAbstraction over Behavior\u201d.<\/td>\nSupports only \u201cAbstraction over Data\u201d.<\/td>\n<\/tr>\n
                                                                                    We use FP when we have few Things with more operations.<\/td>\nWe use OOP when we have few Operations with more Things. For example: Things are classes and Operations are Methods in Java.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

                                                                                    \u4ee5\u4e0b\u306e\u5185\u5bb9\u306f\u3001FP\u3001IP\u3001\u304a\u3088\u3073OOP\u306e\u6bd4\u8f03\u306b\u95a2\u3059\u308b\u8a73\u7d30\u306a\u60c5\u5831\u306b\u3064\u3044\u3066\u306f\u3001\u4ee5\u524d\u306e\u6295\u7a3f\u300cFP\u3001OOP\uff08IP\uff09\u306e\u6bd4\u8f03\u300d\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n

                                                                                    \u53e4\u3044Java Date API\u306e\u554f\u984c\u3092\u8aac\u660e\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u307e\u305f\u3001Java 8\u306eDate and Time API\u304c\u53e4\u3044Date API\u3068Joda Time API\u306b\u6bd4\u3079\u3066\u3069\u306e\u3088\u3046\u306a\u5229\u70b9\u304c\u3042\u308a\u307e\u3059\u304b\uff1f<\/h3>\n

                                                                                    Java\u306e\u53e4\u3044\u65e5\u4ed8API\u306f\u3001Java SE 8\u3088\u308a\u524d\u306b\u5229\u7528\u53ef\u80fd\u306aDate\u3001Calendar\u3001SimpleDateFormat\u306a\u3069\u306e\u65e5\u4ed8API\u306e\u3053\u3068\u3092\u6307\u3057\u307e\u3059\u3002Java\u306e\u53e4\u3044\u65e5\u4ed8API\u306f\u3001Java 8\u306e\u65e5\u4ed8\u304a\u3088\u3073\u6642\u523bAPI\u3084Joda Time API\u3068\u6bd4\u8f03\u3057\u3066\u3001\u4ee5\u4e0b\u306e\u554f\u984c\u3084\u6b20\u70b9\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

                                                                                      \n
                                                                                    • Most of the API is deprecated.<\/li>\n
                                                                                    • Less Readability.<\/li>\n
                                                                                    • java.util.Date is Mutable and not Thread-Safe.<\/li>\n
                                                                                    • java.text.SimpleDateFormat is not Thread-Safe.<\/li>\n
                                                                                    • Less Performance.<\/li>\n<\/ul>\n

                                                                                      Java SE 8\u306e\u65e5\u4ed8\u3068\u6642\u523b\u306eAPI\u306f\u3001Java\u306e\u65e7\u65e5\u4ed8API\u3068\u6bd4\u3079\u3066\u4ee5\u4e0b\u306e\u5229\u70b9\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

                                                                                        \n
                                                                                      • Very simple to use.<\/li>\n
                                                                                      • Human Readable Syntax that is More Readability.<\/li>\n
                                                                                      • All API is Thread-Safe.<\/li>\n
                                                                                      • Better Performance.<\/li>\n<\/ul>\n

                                                                                        \u306a\u305c\u79c1\u305f\u3061\u306fJava SE 8\u3067\u65b0\u3057\u3044\u65e5\u4ed8\u3068\u6642\u523b\u306eAPI\u304c\u5fc5\u8981\u306a\u306e\u3067\u3057\u3087\u3046\u304b\uff1fJava SE 8\u306e\u65e5\u4ed8\u3068\u6642\u523b\u306eAPI\u306f\u3001\u65e7Java\u306e\u65e5\u4ed8API\u306e\u554f\u984c\u3092\u3069\u306e\u3088\u3046\u306b\u89e3\u6c7a\u3057\u3066\u3044\u308b\u306e\u3067\u3057\u3087\u3046\u304b\uff1f<\/h3>\n

                                                                                        \u9ad8\u3044\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3001\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u3001\u30b9\u30b1\u30fc\u30e9\u30d3\u30ea\u30c6\u30a3\u306e\u9ad8\u3044Java\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u958b\u767a\u3059\u308b\u305f\u3081\u306b\u306f\u3001Java 8\u306e\u65e5\u4ed8\u3068\u6642\u523bAPI\u304c\u5fc5\u8981\u3067\u3059\u3002Java 8\u306e\u65e5\u4ed8\u3068\u6642\u523bAPI\u306f\u3001\u3059\u3079\u3066\u306eJava\u306e\u53e4\u3044\u65e5\u4ed8API\u306e\u554f\u984c\u3092\u3001\u30a4\u30df\u30e5\u30fc\u30bf\u30d3\u30ea\u30c6\u30a3\u3068\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u306e\u539f\u5247\u306b\u5f93\u3063\u3066\u89e3\u6c7a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n

                                                                                        Java\u306e\u53e4\u3044Java Date API\u3068Java 8\u306e\u65e5\u4ed8\u3068\u6642\u523bAPI\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n

                                                                                        Java\u306e\u53e4\u3044Java Date API\u3068Java 8\u306eDate and Time API\u306e\u9055\u3044:<\/p>\n

                                                                                        \n
                                                                                        \n\n\n\n\n\n\n\n\n\n\n\n\n\n
                                                                                        S.No<\/a>.<\/th>\nJava\u2019s OLD Java Date API<\/th>\nJava 8\u2019s Date and Time API<\/th>\n<\/tr>\n<\/thead>\n
                                                                                        1.<\/td>\nAvailable before Java 8 too.<\/td>\nIt is introduced in Java SE 8<\/td>\n<\/tr>\n
                                                                                        2.<\/td>\nNot Thread Safe.<\/td>\nThread Safe.<\/td>\n<\/tr>\n
                                                                                        3.<\/td>\nMutable API.<\/td>\nImmutable API.<\/td>\n<\/tr>\n
                                                                                        4.<\/td>\nLess Performance.<\/td>\nBetter Performance.<\/td>\n<\/tr>\n
                                                                                        5.<\/td>\nLess Readability.<\/td>\nMore Readability.<\/td>\n<\/tr>\n
                                                                                        6.<\/td>\nIt\u2019s not recommended to use as its deprecated.<\/td>\nIt\u2019s always recommended to use.<\/td>\n<\/tr>\n
                                                                                        7.<\/td>\nNot Extendable.<\/td>\nEasy to Extend.<\/td>\n<\/tr>\n
                                                                                        8.<\/td>\nIt defines months values from 0 to 11, that is January = 0.<\/td>\nIt defines months values from 1 to 12, that is January = 1.<\/td>\n<\/tr>\n
                                                                                        9.<\/td>\nIt\u2019s an old API.<\/td>\nIt\u2019s a new API.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

                                                                                        Multiple Inheritance\u3068\u306f\u4f55\u3067\u3059\u304b\uff1fJava 8\u306f\u3069\u306e\u3088\u3046\u306bMultiple Inheritance\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u307e\u3059\u304b\uff1f<\/h3>\n

                                                                                        \u8907\u6570\u306e\u7d99\u627f\u3068\u306f\u3001\u30af\u30e9\u30b9\u304c\u8907\u6570\u306e\u89aa\u30af\u30e9\u30b9\u304b\u3089\u7279\u6027\u3084\u6a5f\u80fd\u3092\u53d7\u3051\u7d99\u3050\u3053\u3068\u304c\u3067\u304d\u308b\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002\u3057\u304b\u3057\u3001Java 7\u4ee5\u524d\u3067\u306f\u3001\u8907\u6570\u306e\u7d99\u627f\u306f\u4e0d\u53ef\u80fd\u3067\u3057\u305f\u3002\u306a\u305c\u306a\u3089\u3001Java\u306f\u300c\u30af\u30e9\u30b9\u306f\u305f\u3060\u4e00\u3064\u306e\u30af\u30e9\u30b9\u307e\u305f\u306f\u62bd\u8c61\u30af\u30e9\u30b9\u3092\u7d99\u627f\u3059\u3079\u304d\u300d\u3068\u3044\u3046\u30eb\u30fc\u30eb\u3092\u5f93\u3063\u3066\u3044\u308b\u304b\u3089\u3067\u3059\u3002\u3057\u304b\u3057\u3001Java\u3067\u306f\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u4f7f\u7528\u3057\u3066\u8907\u6570\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u304b\u3089\u306e\u5b9f\u88c5\u7d99\u627f\u3092\u884c\u3046\u3053\u3068\u306f\u53ef\u80fd\u3067\u3059\u3002\u305f\u3060\u3057\u3001Java 8\u3067\u306f\u300c\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3067\u306e\u30e1\u30bd\u30c3\u30c9\u306e\u5b9f\u88c5\u300d\u3092\u30b5\u30dd\u30fc\u30c8\u3059\u308b\u305f\u3081\u306b\u3001\u65b0\u305f\u306a\u6a5f\u80fd\u3067\u3042\u308b\u30c7\u30d5\u30a9\u30eb\u30c8\u30e1\u30bd\u30c3\u30c9\u304c\u5c0e\u5165\u3055\u308c\u307e\u3057\u305f\u3002\u3053\u306e\u6a5f\u80fd\u306b\u3088\u308a\u3001Java 8\u3067\u306f\u3044\u304f\u3064\u304b\u306e\u5236\u9650\u4ed8\u304d\u3067\u8907\u6570\u306e\u7d99\u627f\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n

                                                                                        \u30c7\u30d5\u30a9\u30eb\u30c8\u30e1\u30bd\u30c3\u30c9\u306b\u3088\u308b\u30a4\u30f3\u30bf\u30d5\u30a7\u30fc\u30b9\u306b\u304a\u3051\u308b\u30c0\u30a4\u30e4\u30e2\u30f3\u30c9\u554f\u984c\u3068\u306f\u4f55\u3067\u3059\u304b\uff1fJava 8\u306f\u3053\u306e\u554f\u984c\u3092\u3069\u306e\u3088\u3046\u306b\u89e3\u6c7a\u3057\u3066\u3044\u307e\u3059\u304b\uff1f<\/h3>\n
                                                                                        \"diamond<\/div>\n
                                                                                        interface A {\r\n\tdefault void display() {\r\n\t\tSystem.out.println(\"A\");\r\n\t}\r\n}\r\n\r\ninterface B extends A {\r\n\tdefault void display() {\r\n\t\tSystem.out.println(\"B\");\r\n\t}\r\n}\r\n\r\ninterface C extends A {\r\n\tdefault void display() {\r\n\t\tSystem.out.println(\"C\");\r\n\t}\r\n}\r\n\r\nclass D implements B, C {\r\n}\r\n<\/code><\/pre>\n
                                                                                        \u4e0a\u8a18\u306e\u30b3\u30fc\u30c9\u30b9\u30cb\u30da\u30c3\u30c8\u3067\u306f\u3001\u30af\u30e9\u30b9D\u306f\u300c\u30c7\u30d5\u30a9\u30eb\u30c8\u30e1\u30bd\u30c3\u30c9\u306edisplay\u304c\u30af\u30e9\u30b9C\u3068B\u304b\u3089\u7d99\u627f\u3055\u308c\u3066\u304a\u308a\u3001\u30d1\u30e9\u30e1\u30fc\u30bf\u30fc()\u3068()\u3092\u6301\u3064\u91cd\u8907\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u540d\u3067\u3059\u300d\u3068\u3044\u3046\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3059\u3002\u3053\u308c\u306f\u3001Java\u30b3\u30f3\u30d1\u30a4\u30e9\u304c\u30af\u30e9\u30b9D\u3067\u3069\u306edisplay()\u3092\u4f7f\u7528\u3059\u308b\u304b\u6df7\u4e71\u3059\u308b\u305f\u3081\u3067\u3059\u3002\u30af\u30e9\u30b9D\u306f\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9B\u3068C\u306e\u4e21\u65b9\u304b\u3089display()\u30e1\u30bd\u30c3\u30c9\u3092\u7d99\u627f\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u554f\u984c\u3092\u89e3\u6c7a\u3059\u308b\u305f\u3081\u306b\u3001Java 8\u3067\u306f\u4ee5\u4e0b\u306e\u89e3\u6c7a\u7b56\u304c\u63d0\u4f9b\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
                                                                                        class D implements B, C {\r\n\r\n\t@Override\r\n\tpublic void display() {\r\n\t\tB.super.display();\r\n\t}\r\n\t\r\n}\r\n<\/code><\/pre>\n
                                                                                        \u3053\u306eB.super.display();\u306f\u3001\u3053\u306e\u30c0\u30a4\u30e4\u30e2\u30f3\u30c9\u306e\u554f\u984c\u3092\u89e3\u6c7a\u3057\u307e\u3059\u3002C\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u30c7\u30d5\u30a9\u30eb\u30c8\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u305f\u3044\u5834\u5408\u306f\u3001C.super.display();\u3092\u4f7f\u7528\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u3053\u308c\u304cJava 8\u306e\u30a4\u30f3\u30bf\u30d3\u30e5\u30fc\u306e\u554f\u984c\u306e\u3059\u3079\u3066\u3067\u3059\u3002\u4eca\u5f8c\u306e\u6295\u7a3f\u3067\u3055\u3089\u306bJava SE 8\u306e\u30a4\u30f3\u30bf\u30d3\u30e5\u30fc\u306e\u554f\u984c\u3092\u53d6\u308a\u4e0a\u3052\u307e\u3059\u3002\u79c1\u306e\u6295\u7a3f\u304c\u6c17\u306b\u5165\u3063\u305f\u308a\u3001\u554f\u984c\u3084\u63d0\u6848\u304c\u3042\u308b\u5834\u5408\u306f\u3001\u30b3\u30e1\u30f3\u30c8\u3092\u6295\u7a3f\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
                                                                                        \u4ee5\u524d\u306e\u6295\u7a3f\u3067\u306f\u3001\u91cd\u8981\u306aJava SE 8\u306e\u9762\u63a5\u306e\u8cea\u554f\u3068\u56de\u7b54\u306b\u3064\u3044\u3066\u8a71\u3057\u307e\u3057\u305f\u3002\u3053\u306e\u6295\u7a3f\u3067\u306f\u3001\u3055\u3089\u306bJava SE 8\u306e\u9762\u63a5\u306e\u8cea\u554f\u3068\u56de\u7b54\u306b\u3064\u3044\u3066\u8b70\u8ad6\u3057\u307e\u3059\u3002\u3053\u306e\u6295\u7a3f\u3092\u8aad\u3080\u524d\u306b\u3001\u4ee5\u4e0b\u306eURL\u304b\u3089\u79c1\u306e\u4ee5\u524d\u306e\u6295\u7a3f\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\uff1a […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-591","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"yoast_head":"\nJava SE 8\u306e\u9762\u63a5\u8cea\u554f\u3068\u56de\u7b54\uff08\u30d1\u30fc\u30c82\uff09 - 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