Scala\u306e\u9762\u63a5\u554f\u984c\u3068\u56de\u7b54\u3078\u3088\u3046\u3053\u305d\u3002\u73fe\u5728\u3001\u307b\u3068\u3093\u3069\u306e\u91d1\u878d\/\u9280\u884c\u3001\u653f\u5e9c\u3001\u96fb\u6c17\u901a\u4fe1\u3001\u30bd\u30fc\u30b7\u30e3\u30eb\u30cd\u30c3\u30c8\u30ef\u30fc\u30ad\u30f3\u30b0\u306a\u3069\u306e\u4f01\u696d\u306f\u3001Scala\u3001Play\u3001Akka\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3092\u4f7f\u7528\u3057\u3066\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3092\u958b\u767a\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u306f\u3001OOP\u3068FP\u306e\u4e21\u65b9\u306e\u6a5f\u80fd\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3001\u591a\u304f\u306e\u5229\u70b9\u3082\u63d0\u4f9b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u79c1\u306f\u3001\u3044\u304f\u3064\u304b\u306e\u6295\u7a3f\u3092\u901a\u3058\u3066\u3001\u79c1\u306e\u9762\u63a5\u306e\u77e5\u8b58\u3068Scala\u30a8\u30b3\u30b7\u30b9\u30c6\u30e0\u307e\u305f\u306f\u30d5\u30eb\u30b9\u30bf\u30c3\u30afScala\uff08Scala\/Play\/Akka\uff09\u958b\u767a\u306e\u7d4c\u9a13\u3092\u5171\u6709\u3057\u3088\u3046\u3068\u601d\u3044\u307e\u3059\u3002\u79c1\u306f3\u3064\u306e\u5225\u3005\u306e\u6295\u7a3f\u3092\u5171\u6709\u3057\u307e\u3059\u3002\u3044\u304f\u3064\u304b\u306e\u8cea\u554f\u306f1\u3064\u306e\u8cea\u554f\u3060\u3051\u3067\u3042\u308a\u3001\u3044\u304f\u3064\u304b\u306e\u8cea\u554f\u306b\u306f\u30b5\u30d6\u8cea\u554f\u304c\u3042\u308a\u307e\u3059\u3002\u5408\u8a08\u3067\u7d04200\u306e\u8cea\u554f\u306b\u3064\u3044\u3066\u8a71\u3057\u5408\u3044\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u8cea\u554f\u306b\u6163\u308c\u3066\u3044\u308b\u306a\u3089\u3001\u5fc5\u305a\u3059\u3079\u3066\u306eScala\u958b\u767a\u8005\u306e\u9762\u63a5\u306b\u5408\u683c\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3068\u78ba\u4fe1\u3057\u3066\u3044\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u30d5\u30eb\u30b9\u30bf\u30c3\u30afScala\u958b\u767a\u8005\u3068\u3057\u3066\u7d9a\u3051\u308b\u3064\u3082\u308a\u306a\u3089\u3001\u3053\u308c\u3089\u306e\u30d5\u30eb\u30b9\u30bf\u30c3\u30afScala\u6280\u8853\u3092\u5fb9\u5e95\u7684\u306b\u5b66\u3076\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
\uff13\u3064\u306e\u30d1\u30fc\u30c4\u306b\u5206\u3051\u3066\u3001Scala\/Play\/Akka\u306e\u30a4\u30f3\u30bf\u30d3\u30e5\u30fc\u306e\u8cea\u554f\u3068\u56de\u7b54\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002<\/p>\n
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\u79c1\u305f\u3061\u306f\u307e\u305f\u3001Scala\u3068Java\u306e\u69cb\u9020\u306e\u9055\u3044\u306b\u3064\u3044\u3066\u3082\u8a71\u3057\u5408\u3044\u307e\u3059\u306e\u3067\u3001Java\u304b\u3089Scala\u306b\u79fb\u884c\u3059\u308b\u30e6\u30fc\u30b6\u30fc\u306f\u3001\u3053\u308c\u3089\u306e\u6295\u7a3f\u304b\u3089\u5229\u76ca\u3092\u5f97\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u306e\u6295\u7a3f\u3067\u306f\u3001\u57fa\u672c\u7684\u306aScala\u306e\u30a4\u30f3\u30bf\u30d3\u30e5\u30fc\u306e\u8cea\u554f\u306b\u3064\u3044\u3066\u8a71\u3057\u5408\u3044\u307e\u3059\u3002\u6b8b\u308a\u306e2\u3064\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u306b\u3064\u3044\u3066\u306f\u3001\u79c1\u306e\u6b21\u306e\u6295\u7a3f\u3092\u304a\u8aad\u307f\u304f\u3060\u3055\u3044\u3002<\/p>\n
\u3053\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u3059\u3079\u3066\u306eScala\u57fa\u672c\u30a4\u30f3\u30bf\u30d3\u30e5\u30fc\u306e\u8cea\u554f\u3092\u30ea\u30b9\u30c8\u30a2\u30c3\u30d7\u3057\u3001\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u305d\u308c\u3089\u3092\u8a73\u7d30\u306b\u8b70\u8ad6\u3057\u307e\u3059\u3002<\/p>\n
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\u95a2\u6570\u578b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306b\u3064\u3044\u3066\u306f\u3001\u79c1\u306e\u524d\u306e\u6295\u7a3f\u3092\u53c2\u7167\u3057\u3066\u304f\u3060\u3055\u3044\uff08\u524d\u306e\u6295\u7a3f\u3092\u958b\u304f\u306b\u306f\u30ea\u30f3\u30af\u3092\u30af\u30ea\u30c3\u30af\u3057\u3066\u304f\u3060\u3055\u3044\uff09\u3002<\/p>\n
\u3053\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u524d\u306e\u30ea\u30b9\u30c8\u304b\u3089\u305d\u308c\u305e\u308c\u306e\u8cea\u554f\u3092\u53d6\u308a\u4e0a\u3052\u3001\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u9069\u5207\u306a\u4f8b\u3092\u7528\u3044\u3066\u8a73\u7d30\u306b\u8b70\u8ad6\u3057\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u6982\u5ff5\u3092\u4f8b\u3092\u4ea4\u3048\u3066\u6df1\u304f\u7406\u89e3\u3057\u305f\u3044\u5834\u5408\u306f\u3001Scala\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u79c1\u306e\u4ee5\u524d\u306e\u6295\u7a3f\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n
\u30b9\u30ab\u30e9\u306fSCAlable LAnguage\u306e\u7565\u3067\u3059\u3002\u30de\u30fc\u30c6\u30a3\u30f3\u30fb\u30aa\u30fc\u30c0\u30fc\u30b9\u30ad\u30fc\u6c0f\u306f\u30b9\u30ab\u30e9\u306e\u751f\u307f\u306e\u89aa\u3067\u3059\u3002\u30b9\u30ab\u30e9\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3068\u95a2\u6570\u578b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u4e21\u65b9\u3092\u30b5\u30dd\u30fc\u30c8\u3059\u308b\u30de\u30eb\u30c1\u30d1\u30e9\u30c0\u30a4\u30e0\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3067\u3059\u3002\u30b9\u30ab\u30e9\u306f\u30de\u30fc\u30c6\u30a3\u30f3\u30fb\u30aa\u30fc\u30c0\u30fc\u30b9\u30ad\u30fc\u6c0f\u306b\u3088\u3063\u3066\u8a2d\u8a08\u30fb\u958b\u767a\u3055\u308c\u307e\u3057\u305f\u3002\u30b9\u30ab\u30e9\u306f\u578b\u5b89\u5168\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u30fb\u95a2\u6570\u578b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0JVM\u8a00\u8a9e\u3067\u3059\u3002\u30b9\u30ab\u30e9\u306fJVM\uff08Java\u4eee\u60f3\u30de\u30b7\u30f3\uff09\u4e0a\u3067\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002\u30b9\u30ab\u30e9\u306f\u30cf\u30a4\u30d6\u30ea\u30c3\u30c9\u95a2\u6570\u578b\uff08\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u3068\u95a2\u6570\u578b\uff09\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0JVM\u8a00\u8a9e\u3067\u3059\u3002\u30b9\u30ab\u30e9\u306f\u5f37\u529b\u3067\u9759\u7684\u306a\u578b\u30b7\u30b9\u30c6\u30e0\u3092\u6301\u3063\u3066\u3044\u307e\u3059\u3002\u30b9\u30ab\u30e9\u3067\u306f\u3001\u3059\u3079\u3066\u306e\u578b\u304c\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u30c1\u30a7\u30c3\u30af\u3055\u308c\u307e\u3059\u3002<\/p>\n
\u306f\u3044\u3001Scala\u306f\u9759\u7684\u578b\u4ed8\u3051\u306e\u8a00\u8a9e\u3067\u3059\u3002\u9759\u7684\u578b\u4ed8\u3051\u3068\u306f\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u30b3\u30f3\u30d1\u30a4\u30e9\u304c\u578b\u30c1\u30a7\u30c3\u30af\u3092\u884c\u3046\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002\u3053\u306e\u7a2e\u306e\u8a00\u8a9e\u306e\u4e3b\u306a\u5229\u70b9\u306f\u3001\u958b\u767a\u8005\u3068\u3057\u3066\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306e\u30a8\u30e9\u30fc\u3092\u907f\u3051\u308b\u305f\u3081\u306b\u6b63\u3057\u3044\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u5fc5\u8981\u304c\u3042\u308b\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002\u30b3\u30f3\u30d1\u30a4\u30e9\u304c\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u591a\u304f\u306e\u30a8\u30e9\u30fc\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u305f\u3081\u3001\u5b9f\u884c\u6642\u306b\u306f\u591a\u304f\u306e\u554f\u984c\u3084\u30d0\u30b0\u304c\u767a\u751f\u3057\u307e\u305b\u3093\u3002\u4f8b\uff1aJava\u3001Scala\u3001C\u3001C++\u3001Haskell\u306a\u3069\u3002\u52d5\u7684\u578b\u4ed8\u3051\u306e\u8a00\u8a9e\u3068\u306f\u3001\u578b\u30c1\u30a7\u30c3\u30af\u304c\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u3067\u306f\u306a\u304f\u5b9f\u884c\u6642\u306b\u884c\u308f\u308c\u308b\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002\u30b3\u30f3\u30d1\u30a4\u30e9\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u578b\u30c1\u30a7\u30c3\u30af\u3092\u884c\u308f\u306a\u3044\u305f\u3081\u3001\u5b9f\u884c\u6642\u306b\u306f\u3088\u308a\u591a\u304f\u306e\u554f\u984c\u3084\u30d0\u30b0\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u4f8b\uff1aGroovy\u3001JavaScript\u3001Ruby\u3001Python\u3001Smalltalk\u306a\u3069\u3002<\/p>\n
\u7d14\u7c8b\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3068\u306f\u3001\u3059\u3079\u3066\u304c\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u3057\u3066\u6271\u308f\u308c\u308b\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002Java\u306f\u7d14\u7c8b\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\uff08OOP\uff09\u8a00\u8a9e\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u306a\u305c\u306a\u3089\u3001Java\u306f\u4ee5\u4e0b\u306e2\u3064\u306e\u975eOOP\u6982\u5ff5\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u308b\u304b\u3089\u3067\u3059\u3002<\/p>\n
\u306f\u3044\u3001Scala\u306f\u7d14\u7c8b\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3067\u3059\u3002\u306a\u305c\u306a\u3089\u3001Scala\u3067\u306f\u5168\u3066\u304c\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3042\u308a\u3001\u5168\u3066\u304c\u5024\u3067\u3042\u308b\u304b\u3089\u3067\u3059\u3002\u95a2\u6570\u3082\u5024\u3067\u3042\u308a\u3001\u5024\u3082\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3059\u3002Scala\u306b\u306f\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u306a\u30c7\u30fc\u30bf\u578b\u3082\u9759\u7684\u30e1\u30f3\u30d0\u30fc\u3082\u5b58\u5728\u3057\u307e\u305b\u3093\u3002<\/p>\n
\u306f\u3044\u3001Scala\u306f\u3059\u3079\u3066\u306e\u95a2\u6570\u578b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\uff08FP\uff09\u306e\u6982\u5ff5\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u307e\u3059\u3002Java 8\u306f\u4e00\u90e8\u306e\u95a2\u6570\u578b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u69cb\u9020\u3092\u5c0e\u5165\u3057\u307e\u3057\u305f\u304c\u3001\u3059\u3079\u3066\u306e\u95a2\u6570\u578b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u6982\u5ff5\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u308b\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u4f8b\u3048\u3070\u3001Java 8\u3067\u306f\u30d1\u30bf\u30fc\u30f3\u30de\u30c3\u30c1\u30f3\u30b0\u3001\u95a2\u6570\u306e\u30ab\u30ea\u30fc\u5316\u3001\u6697\u9ed9\u306e\u578b\u5909\u63db\u306a\u3069\u306f\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u3066\u3044\u307e\u305b\u3093\u3002<\/p>\n
Scala\u8a00\u8a9e\u3092\u4f7f\u7528\u3057\u3066\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u958b\u767a\u3059\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u5229\u70b9\u3084\u30e1\u30ea\u30c3\u30c8\u3001\u304a\u3088\u3073\u6b20\u70b9\u304c\u5f97\u3089\u308c\u307e\u3059\uff1aScala\u8a00\u8a9e\u306e\u5229\u70b9\uff1a<\/p>\n
\u30b9\u30ab\u30e9\u8a00\u8a9e\u306e\u6b20\u70b9:<\/p>\n
\u6ce8\u610f\uff1a\u79c1\u305f\u3061\u306f\u30b9\u30ab\u30e9\u30b3\u30fc\u30c9\u3092\u3001\u3088\u308a\u8aad\u307f\u3084\u3059\u3044\u65b9\u6cd5\u3042\u308b\u3044\u306f\u8aad\u307f\u306b\u304f\u3044\u65b9\u6cd5\u306e\u3044\u305a\u308c\u304b\u3067\u8a18\u8ff0\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
Scala\u306e\u591a\u304f\u306e\u5229\u70b9\u306b\u52a0\u3048\u3066\u30011\u3064\u3060\u3051\u5927\u304d\u306a\u6b20\u70b9\u304c\u3042\u308a\u307e\u3059: \u4e92\u63db\u6027\u306e\u554f\u984c\u3067\u3059\u3002\u6700\u65b0\u30d0\u30fc\u30b8\u30e7\u30f3\u306eScala\u306b\u30a2\u30c3\u30d7\u30b0\u30ec\u30fc\u30c9\u3057\u305f\u3044\u5834\u5408\u3001\u30d1\u30c3\u30b1\u30fc\u30b8\u540d\u3001\u30af\u30e9\u30b9\u540d\u3001\u30e1\u30bd\u30c3\u30c9\u540d\u306a\u3069\u3092\u5909\u66f4\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001\u53e4\u3044Scala\u30d0\u30fc\u30b8\u30e7\u30f3\u3092\u4f7f\u7528\u3057\u3066\u304a\u308a\u3001\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067BeanProperty\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u5834\u5408\u3001\u3053\u308c\u306f\u53e4\u3044\u30d0\u30fc\u30b8\u30e7\u30f3\u3067\u306f\u300cscala.reflect.BeanProperty\u300d\u3068\u3044\u3046\u5f62\u3067\u300cscala.reflect\u300d\u306b\u5b58\u5728\u3057\u3066\u3044\u307e\u3057\u305f\u3002\u65b0\u3057\u3044Scala\u30d0\u30fc\u30b8\u30e7\u30f3\u306b\u30a2\u30c3\u30d7\u30b0\u30ec\u30fc\u30c9\u3057\u305f\u3044\u5834\u5408\u3001\u3053\u306e\u30d1\u30c3\u30b1\u30fc\u30b8\u3092\u300cscala.reflect\u300d\u304b\u3089\u300cscala.beans\u300d\u306b\u5909\u66f4\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
Java\u306e\u30e2\u30c3\u30c8\u30fc\u300cWrite Once Run Anywhere\u300d\u306e\u3088\u3046\u306b\u3001Scala\u306b\u3082\u300c\u5c11\u306a\u3044\u30b3\u30fc\u30c9\u3067\u3088\u308a\u591a\u304f\u3092\u884c\u3046\u300d\u3068\u3044\u3046\u30e2\u30c3\u30c8\u30fc\u304c\u3042\u308a\u307e\u3059\u3002\u300c\u5c11\u306a\u3044\u30b3\u30fc\u30c9\u3067\u3088\u308a\u591a\u304f\u3092\u884c\u3046\u300d\u3068\u306f\u3001\u5c11\u306a\u3044\u30b3\u30fc\u30c9\u3067\u3088\u308a\u8907\u96d1\u306a\u30d7\u30ed\u30b0\u30e9\u30e0\u3084\u30ed\u30b8\u30c3\u30af\u3092\u958b\u767a\u3067\u304d\u308b\u3068\u3044\u3046\u610f\u5473\u3067\u3059\u3002<\/p>\n
Java\u3001Scala\u3001Groovy\u3001Closure\u306f\u3001\u6700\u3082\u4eba\u6c17\u306e\u3042\u308bJVM\uff08Java Virtual Machine\uff09\u8a00\u8a9e\u3067\u3059\u3002Scala\u3001Groovy\u3001Closure\u306eJVM\u8a00\u8a9e\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u7279\u5fb4\u3068\u95a2\u6570\u578b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u7279\u5fb4\u306e\u4e21\u65b9\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u307e\u3059\u3002Java SE 8\u306f\u3001\u3059\u3079\u3066\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u7279\u5fb4\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u307e\u3059\u3002\u305f\u3060\u3057\u3001Lambda\u5f0f\u3084\u95a2\u6570\u3001\u578b\u63a8\u8ad6\u3001\u9ad8\u968e\u95a2\u6570\u306a\u3069\u3001\u95a2\u6570\u578b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u7279\u5fb4\u306f\u307b\u3068\u3093\u3069\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u307e\u305b\u3093\u3002<\/p>\n
\u79c1\u305f\u3061\u304cJava\u3067\u77e5\u3063\u3066\u3044\u308b\u3088\u3046\u306b\u3001\u3059\u3079\u3066\u306e\u30af\u30e9\u30b9\uff08Java API\u30af\u30e9\u30b9\u307e\u305f\u306f\u30e6\u30fc\u30b6\u30fc\u5b9a\u7fa9\u30af\u30e9\u30b9\uff09\u306e\u30b9\u30fc\u30d1\u30fc\u30af\u30e9\u30b9\u306fjava.lang.Object\u3067\u3059\u3002\u540c\u3058\u3088\u3046\u306b\u3001Scala\u3067\u3082\u3059\u3079\u3066\u306e\u30af\u30e9\u30b9\u307e\u305f\u306f\u30c8\u30ec\u30a4\u30c8\u306e\u30b9\u30fc\u30d1\u30fc\u30af\u30e9\u30b9\u306f\u300cAny\u300d\u30af\u30e9\u30b9\u3067\u3059\u3002\u300cAny\u300d\u30af\u30e9\u30b9\u306f\u300cscala.Any\u300d\u3068\u3044\u3046\u30d1\u30c3\u30b1\u30fc\u30b8\u3067\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
Scala\u3067\u306f\u3001\u30e1\u30bd\u30c3\u30c9\u3001\u95a2\u6570\u3001\u30c8\u30ec\u30a4\u30c8\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3001\u307e\u305f\u306f\u30af\u30e9\u30b9\u306b\u30a2\u30af\u30bb\u30b9\u4fee\u98fe\u5b50\u3092\u6307\u5b9a\u3057\u306a\u3044\u5834\u5408\u3001\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u30a2\u30af\u30bb\u30b9\u4fee\u98fe\u5b50\u306f\u300cpublic\u300d\u3067\u3059\u3002\u30d5\u30a3\u30fc\u30eb\u30c9\u306b\u5bfe\u3057\u3066\u3082\u540c\u69d8\u3067\u3001\u300cpublic\u300d\u304c\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u30a2\u30af\u30bb\u30b9\u4fee\u98fe\u5b50\u3067\u3059\u3002\u3053\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u6a5f\u80fd\u306e\u305f\u3081\u3001Scala\u306b\u306f\u300cpublic\u300d\u3068\u3044\u3046\u30ad\u30fc\u30ef\u30fc\u30c9\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n
\u30b9\u30ab\u30e9\u30b3\u30f3\u30d1\u30a4\u30e9\u306b\u3088\u3063\u3066\u3001\u578b\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u63a8\u8ad6\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u306f\u300c\u578b\u63a8\u8ad6\u300d\u3068\u3057\u3066\u77e5\u3089\u308c\u3066\u3044\u307e\u3059\u3002\u578b\u3068\u306f\u3001\u30c7\u30fc\u30bf\u578b\u307e\u305f\u306f\u7d50\u679c\u578b\u3092\u610f\u5473\u3057\u307e\u3059\u3002\u5909\u6570\u306e\u578b\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u578b\u3001\u30e1\u30bd\u30c3\u30c9\/\u95a2\u6570\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u578b\u3001\u30e1\u30bd\u30c3\u30c9\/\u95a2\u6570\u306e\u623b\u308a\u5024\u306e\u578b\u306a\u3069\u3001Scala\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u591a\u304f\u306e\u5834\u6240\u3067\u578b\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002\u7c21\u5358\u306b\u8a00\u3048\u3070\u3001\u5909\u6570\u3084\u5f0f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306a\u3069\u306e\u578b\u3092\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u30b3\u30f3\u30d1\u30a4\u30e9\u304c\u5224\u65ad\u3059\u308b\u3053\u3068\u304c\u300c\u578b\u63a8\u8ad6\u300d\u3068\u3057\u3066\u77e5\u3089\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
Scala\u306eInt\u3068Java\u306ejava.lang.Integer\u306e\u985e\u4f3c\u70b9\uff1a<\/p>\n
Scala\u306eInt\u3068Java\u306ejava.lang.Integer\u306e\u9055\u3044\u306f\u6b21\u306e\u901a\u308a\u3067\u3059:<\/p>\n
Java\u306eInteger\u306f\u3001Scala\u306eInt\u3068RichInt\u306b\u4f3c\u305f\u3082\u306e\u3067\u3059\u3002RichInt\u306f\u3001scala.runtime\u30d1\u30c3\u30b1\u30fc\u30b8\u3067\u5b9a\u7fa9\u3055\u308c\u305ffinal\u30af\u30e9\u30b9\u3067\u3001\u300cscala.runtime.RichInt\u300d\u3068\u3044\u3046\u3088\u3046\u306b\u6307\u5b9a\u3055\u308c\u307e\u3059\u3002Scala\u306b\u304a\u3044\u3066\u3001Int\u3068RichInt\u306e\u95a2\u4fc2\u306f\u3001Scala\u30d7\u30ed\u30b0\u30e9\u30e0\u3067Int\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u81ea\u52d5\u7684\u306b\u305d\u308c\u3092RichInt\u306b\u5909\u63db\u3057\u3066\u3001\u305d\u306e\u30af\u30e9\u30b9\u3067\u5229\u7528\u53ef\u80fd\u306a\u3059\u3079\u3066\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u5229\u7528\u3059\u308b\u3068\u3044\u3046\u3082\u306e\u3067\u3059\u3002RichInt\u306fInt\u306e\u6697\u9ed9\u306e\u30af\u30e9\u30b9\u3068\u3082\u8a00\u3048\u307e\u3059\u3002\uff08\u6b21\u306e\u6295\u7a3f\u3067\u300c\u6697\u9ed9\u306e\u30af\u30e9\u30b9\u3068\u306f\u4f55\u304b\u3001\u304a\u3088\u3073\u6697\u9ed9\u306e\u30af\u30e9\u30b9\u306e\u5229\u70b9\u306b\u3064\u3044\u3066\u300d\u8b70\u8ad6\u3057\u307e\u3059\uff09\u3002<\/p>\n
Scala\u306b\u304a\u3044\u3066\u3001Nothing\u306f\u578b\uff08\u6700\u7d42\u30af\u30e9\u30b9\uff09\u3067\u3059\u3002Scala\u306e\u578b\u30b7\u30b9\u30c6\u30e0\u306e\u6700\u4e0b\u90e8\u306b\u5b9a\u7fa9\u3055\u308c\u3066\u304a\u308a\u3001\u3064\u307e\u308aScala\u306e\u3069\u3093\u306a\u3082\u306e\u306e\u30b5\u30d6\u30bf\u30a4\u30d7\u3067\u3082\u3042\u308a\u307e\u3059\u3002Nothing\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306f\u5b58\u5728\u3057\u307e\u305b\u3093\u3002Scala\u306b\u304a\u3051\u308bNothing\u306e\u4f7f\u7528\u4f8b\uff1a- Nothing\u306b\u306f\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u5b58\u5728\u3057\u306a\u3044\u306e\u3067\u3001\u3044\u3064Scala\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u4f7f\u7528\u3059\u308b\u306e\u3067\u3057\u3087\u3046\u304b\uff1f<\/p>\n
object None extends Option[Nothing]\r\n<\/code><\/pre>\n\n- We can use Nothing as a return type of methods which never return.<\/li>\n
- We can use Nothing as a return type of methods which terminates abnormally.<\/li>\n<\/ul>\n
Nil\u306f\u3001\u7a7a\u306e\u30ea\u30b9\u30c8\u3092\u8868\u3059\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3059\u3002\u4ee5\u4e0b\u306b\u793a\u3059\u3088\u3046\u306b\u3001\u300cscala.collection.immutable\u300d\u30d1\u30c3\u30b1\u30fc\u30b8\u3067\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
object Nil extends List[Nothing]\r\n<\/code><\/pre>\n\u300c\u79c1\u306f\u5b66\u6821\u306b\u6bce\u65e5\u6b69\u3044\u3066\u884c\u304d\u307e\u3059\u300d<\/p>\n
scala> Nil\r\nres5: scala.collection.immutable.Nil.type = List()\r\n\r\nscala> Nil.length\r\nres6: Int = 0\r\n<\/code><\/pre>\nScala\u306b\u304a\u3051\u308bNull\u3068\u306f\u4f55\u3067\u3059\u304b\uff1fScala\u306b\u304a\u3051\u308bnull\u3068\u306f\u4f55\u3067\u3059\u304b\uff1fNull\u3068null\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n
Null\u306fScala\u3067\u306e\u30bf\u30a4\u30d7\uff08final\u30af\u30e9\u30b9\uff09\u3067\u3059\u3002Null\u30bf\u30a4\u30d7\u306f\u3001scala\u30d1\u30c3\u30b1\u30fc\u30b8\u5185\u306e”scala.Null”\u3068\u3057\u3066\u5229\u7528\u53ef\u80fd\u3067\u3059\u3002Null\u30bf\u30a4\u30d7\u306b\u306fnull\u3068\u3044\u3046\u552f\u4e00\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u3042\u308a\u307e\u3059\u3002Scala\u3067\u306f\u3001”null”\u306fscala.Null\u30bf\u30a4\u30d7\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3067\u3059\u3002\u4f8b\uff1a<\/p>\n
scala> val myNullRef : Null = null\r\nmyNullRef: Null = null\r\n<\/code><\/pre>\nNull\u578b\u306e\u53c2\u7167\u306b\u306f\u4ed6\u306e\u5024\u3092\u5272\u308a\u5f53\u3066\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u305b\u3093\u3002Null\u578b\u306e\u53c2\u7167\u306f\u300cnull\u300d\u306e\u5024\u306e\u307f\u3092\u53d7\u3051\u5165\u308c\u307e\u3059\u3002Null\u306f\u3059\u3079\u3066\u306e\u53c2\u7167\u578b\u306e\u30b5\u30d6\u30bf\u30a4\u30d7\u3067\u3059\u3002Null\u306fScala\u306e\u578b\u30b7\u30b9\u30c6\u30e0\u306e\u6700\u4e0b\u5c64\u306b\u4f4d\u7f6e\u3057\u3066\u3044\u307e\u3059\u3002Null\u306f\u5024\u578b\u306e\u30b5\u30d6\u30bf\u30a4\u30d7\u3067\u306f\u306a\u3044\u305f\u3081\u3001\u5024\u578b\u306e\u5909\u6570\u306b\u5bfe\u3057\u3066\u306f\u300cnull\u300d\u3092\u5272\u308a\u5f53\u3066\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4f8b\uff1a<\/p>\n
scala> val myInt : Int = null\r\n:10: error: an expression of type Null is ineligible for implicit conversion\r\n val myInt : Int = null\r\n<\/code><\/pre>\n\u3053\u3053\u3067\u30bf\u30a4\u30d7\u30df\u30b9\u30de\u30c3\u30c1\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3057\u305f\u3002Null\uff08null\uff09\u304c\u898b\u3064\u304b\u308a\u307e\u3057\u305f\u304c\u3001\u5fc5\u8981\u306a\u306e\u306fInt\u3067\u3059\u3002Null\u3068Int\u306e\u9593\u306e\u6697\u9ed9\u306e\u5909\u63db\u306f\u9069\u7528\u3067\u304d\u307e\u305b\u3093\u3002\u306a\u305c\u306a\u3089\u3001\u305d\u308c\u3089\u306f\u66d6\u6627\u3067\u3059\u3002<\/p>\n
Scala\u3067\u306eUnit\u3068\u306f\u4f55\u3067\u3059\u304b\uff1fJava\u306evoid\u3068Scala\u306eUnit\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n
Scala\u3067\u306f\u3001Unit\u306f\u300c\u5024\u304c\u306a\u3044\u300d\u307e\u305f\u306f\u300c\u6709\u7528\u306a\u5024\u304c\u306a\u3044\u300d\u3068\u3044\u3046\u3053\u3068\u3092\u8868\u3059\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002Unit\u306f\u3001scala\u30d1\u30c3\u30b1\u30fc\u30b8\u3067\u5b9a\u7fa9\u3055\u308c\u305f\u6700\u7d42\u7684\u306a\u30af\u30e9\u30b9\u3067\u3042\u308a\u3001\u300cscala.Unit\u300d\u3067\u3059\u3002Unit\u306f\u3001Java\u306evoid\u306b\u985e\u4f3c\u3057\u3066\u3044\u307e\u3059\u304c\u3001\u3044\u304f\u3064\u304b\u306e\u9055\u3044\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
\n- Java\u2019s void does not any value. It is nothing.<\/li>\n
- Scala\u2019s Unit has one value ()<\/li>\n
- () is the one and only value of type Unit in Scala. However, there are no values of type void in Java.<\/li>\n
- Java\u2019s void is a keyword. Scala\u2019s Unit is a final class.<\/li>\n<\/ul>\n
\u4e21\u8005\u306f\u3001\u65b9\u6cd5\u3084\u95a2\u6570\u304c\u4f55\u3082\u8fd4\u3055\u306a\u3044\u3053\u3068\u3092\u8868\u3059\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n
Scala\u306b\u304a\u3044\u3066\u3001val\u3068var\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n
Scala\u3067\u306f\u3001\u5909\u6570\u3092\u5b9a\u7fa9\u3059\u308b\u305f\u3081\u306bval\u3068var\u306e\u4e21\u65b9\u304c\u4f7f\u7528\u3055\u308c\u307e\u3059\u304c\u3001\u305d\u308c\u3089\u306b\u306f\u3044\u304f\u3064\u304b\u306e\u91cd\u8981\u306a\u9055\u3044\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
\n- var stands for variable.<\/li>\n
- val stands for value.<\/li>\n
- As we know, variable means changeable and value means constant.<\/li>\n
- var is used to define Mutable variables that means we can reassign values once its created.<\/li>\n
- val is used to define Immutable variables that means we cannot reassign values once its created.<\/li>\n
- In simple Java terminology, var means \u2018variable\u2019 and val means \u2018final variable\u2019.<\/li>\n<\/ul>\n
Scala\u306eREPL\u3068\u306f\u4f55\u3067\u3059\u304b\uff1fScala\u306eREPL\u306e\u4f7f\u7528\u65b9\u6cd5\u306f\uff1fCMD\u30d7\u30ed\u30f3\u30d7\u30c8\u304b\u3089Scala\u306eREPL\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u65b9\u6cd5\u306f\uff1f<\/h3>\n
REPL\uff08\u30ea\u30d7\u30eb\uff09\u306fRead-Evaluate-Print Loop\u306e\u7565\u3067\u3059\u3002Scala\u3067\u306f\u3001REPL\u306f\u30b3\u30de\u30f3\u30c9\u30d7\u30ed\u30f3\u30d7\u30c8\u304b\u3089Scala\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3059\u308b\u305f\u3081\u306e\u30a4\u30f3\u30bf\u30fc\u30d7\u30ea\u30bf\u3068\u3057\u3066\u6a5f\u80fd\u3057\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001REPL\u306fScala CLI\uff08Command Line Interface\uff09\u307e\u305f\u306fScala\u30b3\u30de\u30f3\u30c9\u30e9\u30a4\u30f3\u30b7\u30a7\u30eb\u3068\u3082\u547c\u3070\u308c\u3066\u3044\u307e\u3059\u3002REPL\u306e\u4e3b\u306a\u76ee\u7684\u306f\u3001\u7df4\u7fd2\u306e\u305f\u3081\u306bScala\u30b3\u30fc\u30c9\u306e\u5c0f\u3055\u306a\u30b9\u30cb\u30da\u30c3\u30c8\u3092\u958b\u767a\u30fb\u30c6\u30b9\u30c8\u3059\u308b\u3053\u3068\u3067\u3059\u3002Scala\u521d\u5fc3\u8005\u306b\u3068\u3063\u3066\u57fa\u672c\u7684\u306a\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u7df4\u7fd2\u306b\u975e\u5e38\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002REPL\u306b\u306f\u300cscala\u300d\u3068\u3044\u3046\u30b3\u30de\u30f3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u30a2\u30af\u30bb\u30b9\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002CMD\u30d7\u30ed\u30f3\u30d7\u30c8\u3067\u300cscala\u300d\u3068\u5165\u529b\u3059\u308b\u3068\u3001Scala\u30b3\u30fc\u30c9\u3092\u5165\u529b\u3057\u3066\u5b9f\u884c\u3067\u304d\u308bREPL\u30b7\u30a7\u30eb\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n
D:\\> scala\r\n\r\nscala>\r\n<\/code><\/pre>\nScala\u306e\u7279\u5fb4\u306f\u4f55\u3067\u3059\u304b?<\/h3>\n
\u300cScala\u8a00\u8a9e\u306f\u3001\u4ee5\u4e0b\u306e\u6a5f\u80fd\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u307e\u3059\u3002\u300d<\/p>\n
\n- Supports both OOP-style(Imperative-Style) and Functional-Style Programming<\/li>\n
- Pure Object-Oriented Programming Language<\/li>\n
- Supports all Functional Features<\/li>\n
- REPL(Read-Evaluate-Print Loop) Interpreter<\/li>\n
- Strong Type System<\/li>\n
- Statically-Typed Language<\/li>\n
- Type Inference<\/li>\n
- Supports Pattern Matching<\/li>\n
- Supports Closures<\/li>\n
- Supports Persistent Data Structures<\/li>\n
- Uses Actor Model to develop Concurrency Applications<\/li>\n
- Interoperable with Java<\/li>\n
- Available all development tools – IDEs, Build Tools, Web Frameworks, TDD and BDD Frameworks<\/li>\n<\/ul>\n
\u95a2\u6570\u578b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3067\u30eb\u30fc\u30d7\u3092\u5b9f\u88c5\u3059\u308b\u65b9\u6cd5\u306f\u3069\u306e\u3088\u3046\u306a\u3082\u306e\u3067\u3059\u304b? \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3068\u95a2\u6570\u578b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u30b9\u30bf\u30a4\u30eb\u306e\u30eb\u30fc\u30d7\u306b\u306f\u3069\u306e\u3088\u3046\u306a\u9055\u3044\u304c\u3042\u308a\u307e\u3059\u304b?<\/h3>\n
\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30b9\u30bf\u30a4\u30eb\u3067\u30eb\u30fc\u30d7\u3092\u5b9f\u88c5\u3059\u308b\u65b9\u6cd5\u306f\u308f\u304b\u308a\u307e\u3059\u3002\u53ef\u5909\u306a\u4e00\u6642\u5909\u6570\u3092\u4f7f\u7528\u3057\u3066\u5909\u6570\u306e\u5024\u3092\u66f4\u65b0\u3057\u3001\u30eb\u30fc\u30d7\u306e\u69cb\u9020\u3092\u5229\u7528\u3057\u307e\u3059\u3002\u3053\u306e\u65b9\u6cd5\u306f\u975e\u5e38\u306b\u624b\u9593\u304c\u304b\u304b\u308a\u3001\u5b89\u5168\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30b9\u30bf\u30a4\u30eb\u3067\u306f\u4ee5\u4e0b\u306e\u69cb\u9020\u3092\u4f7f\u7528\u3057\u3066\u30eb\u30fc\u30d7\u3092\u5b9f\u88c5\u3057\u307e\u3059\u3002<\/p>\n
\n- Loop Constructs<\/li>\n
- Mutability<\/li>\n
- Side Effects<\/li>\n<\/ul>\n
\u79c1\u305f\u3061\u306f\u540c\u3058\u30eb\u30fc\u30d7\u3092\u6a5f\u80fd\u7684\u306a\u65b9\u6cd5\u3067\u7570\u306a\u308b\u65b9\u6cd5\u3067\u5b9f\u88c5\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u305d\u308c\u306f\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u3067\u3059\u3002\u79c1\u305f\u3061\u306f\u4ee5\u4e0b\u306e2\u3064\u306e\u30c6\u30af\u30cb\u30c3\u30af\u3092\u4f7f\u7528\u3057\u3066\u3001\u95a2\u6570\u30b9\u30bf\u30a4\u30eb\u3067\u30eb\u30fc\u30d7\u3092\u5b9f\u88c5\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
\n- Recursion<\/li>\n
- Tail-Recursion<\/li>\n
- Immutability<\/li>\n
- No Side-Effects<\/li>\n<\/ul>\n
\u300cScala\u300d\u306b\u304a\u3051\u308b\u300cApplication\u300d\u3068\u306f\u3001\u3069\u306e\u3088\u3046\u306a\u610f\u5473\u3067\u3059\u304b\uff1f\u307e\u305f\u3001\u300cScala Application\u300d\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f\u300cScala\u300d\u306b\u304a\u3051\u308b\u300cApp\u300d\u3068\u306f\u4f55\u3067\u3059\u304b\uff1fScala\u306e\u300cApp\u300d\u306e\u4f7f\u7528\u76ee\u7684\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n
Scala\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\uff1aScala\u3067\u306f\u3001\u300cscala.App\u300d\u3068\u3044\u3046\u540d\u524d\u306e\u30d1\u30c3\u30b1\u30fc\u30b8\u5185\u306b\u5b9a\u7fa9\u3055\u308c\u308btrait\u300cApp\u300d\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u306fmain\u30e1\u30bd\u30c3\u30c9\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002\u3082\u3057\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3084\u30af\u30e9\u30b9\u304c\u3053\u306etrait\u3092\u7d99\u627f\u3059\u308b\u3068\u3001\u81ea\u52d5\u7684\u306bScala\u5b9f\u884c\u53ef\u80fd\u30d7\u30ed\u30b0\u30e9\u30e0\u3068\u3057\u3066\u6271\u308f\u308c\u307e\u3059\u3002App\u3092\u4f7f\u7528\u3059\u308b\u4e3b\u306a\u5229\u70b9\u306f\u3001main\u30e1\u30bd\u30c3\u30c9\u3092\u66f8\u304b\u306a\u304f\u3066\u3082\u826f\u3044\u3053\u3068\u3067\u3059\u3002\u3057\u304b\u3057\u6b20\u70b9\u3068\u3057\u3066\u306f\u3001scala.App\u306emain()\u30e1\u30bd\u30c3\u30c9\u306f\u30b3\u30de\u30f3\u30c9\u30e9\u30a4\u30f3\u5f15\u6570\u3092\u53c2\u7167\u3059\u308b\u305f\u3081\u306b\u300cargs\u300d\u3068\u3044\u3046\u540d\u524d\u3092\u4f7f\u7528\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u3053\u3068\u3067\u3059\u3002\u4f8b\uff1aScala App\u3092\u4f7f\u308f\u306a\u3044\u5834\u5408\uff1a<\/p>\n
object MyApp {\r\n def main( args: Array[String]){\r\n println(\"Hello World!\")\r\n }\r\n}\r\n<\/code><\/pre>\n\u30b9\u30ab\u30e9\u30a2\u30d7\u30ea\u3067\u3042\u308c\u3070:<\/p>\n
object MyApp extends App{\r\n println(\"Hello World!\")\r\n}\r\n<\/code><\/pre>\n\u4e0a\u8a18\u306e2\u3064\u306e\u4f8b\u3092\u89b3\u5bdf\u3059\u308b\u3068\u30012\u756a\u76ee\u306e\u4f8b\u3067\u306f\u30e1\u30a4\u30f3\u30e1\u30bd\u30c3\u30c9\u3092\u5b9a\u7fa9\u3057\u3066\u3044\u306a\u3044\u305f\u3081\u3001Scala App\uff08\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\uff09\u304b\u3089\u7d99\u627f\u3057\u3066\u3044\u307e\u3059\u3002Scala 2.9\u4ee5\u524d\u3067\u306f\u3001scala.Application\u30c8\u30ec\u30a4\u30c8\u304c\u3042\u308a\u307e\u3057\u305f\u304c\u3001Scala 2.9\u4ee5\u964d\u3067\u306f\u975e\u63a8\u5968\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n
Scala\u306f\u30aa\u30da\u30ec\u30fc\u30bf\u30fc\u306e\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u307e\u3059\u304b\uff1f Java\u306f\u30aa\u30da\u30ec\u30fc\u30bf\u30fc\u306e\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u307e\u3059\u304b\uff1f<\/h3>\n
Java\u3067\u306f\u6f14\u7b97\u5b50\u306e\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u306f\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u3066\u3044\u307e\u305b\u3093\u3002\u4e00\u65b9\u3001Scala\u3067\u306f\u6f14\u7b97\u5b50\u306e\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u304c\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u305d\u306e\u7406\u7531\u306f\u3001Java\u304c\u300c+*\/\u300d\u3068\u3044\u3063\u305f\u8aa4\u89e3\u3092\u62db\u304f\u30e1\u30bd\u30c3\u30c9\u540d\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u305f\u304f\u306a\u3044\u304b\u3089\u3067\u3059\u3002Scala\u3067\u306f\u3001\u958b\u767a\u8005\u306b\u3069\u306e\u30e1\u30bd\u30c3\u30c9\u540d\u3092\u4f7f\u7528\u3059\u308b\u304b\u3092\u67d4\u8edf\u306b\u6c7a\u5b9a\u3059\u308b\u6a29\u9650\u304c\u4e0e\u3048\u3089\u308c\u3066\u3044\u307e\u3059\u3002\u4f8b\u3048\u3070\u30012 + 3\u3068\u547c\u3073\u51fa\u3059\u5834\u5408\u3001’+’\u306f\u6f14\u7b97\u5b50\u3067\u306f\u306a\u304f\u3001Int\u30af\u30e9\u30b9\uff08\u307e\u305f\u306f\u6697\u9ed9\u306e\u578b\uff09\u306b\u5b58\u5728\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002\u5185\u90e8\u7684\u306b\u306f\u3001\u3053\u306e\u547c\u3073\u51fa\u3057\u306f “2.+(3)” \u306b\u5909\u63db\u3055\u308c\u307e\u3059\u3002<\/p>\n
\u8868\u73fe\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f\u6587\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f\u8868\u73fe\u3068\u6587\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n
\u5f0f: \u5f0f\u306f\u5024\u3092\u610f\u5473\u3057\u3001\u5024\u306b\u8a55\u4fa1\u3055\u308c\u308b\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002\u5f0f\u304c\u5024\u3092\u8fd4\u3059\u305f\u3081\u3001\u305d\u308c\u3092\u5909\u6570\u306b\u5272\u308a\u5f53\u3066\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4f8b: Scala\u306eIf\u6761\u4ef6\u3001Java\u306e\u4e09\u9805\u6f14\u7b97\u5b50\u3002
\n\u6587: \u6587\u306f1\u3064\u307e\u305f\u306f\u8907\u6570\u306e\u30a2\u30af\u30b7\u30e7\u30f3\u3084\u64cd\u4f5c\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002\u3064\u307e\u308a\u3001\u6587\u306f\u30a2\u30af\u30b7\u30e7\u30f3\u3092\u5b9f\u884c\u3057\u307e\u3059\u3002\u5024\u304c\u8fd4\u3089\u306a\u3044\u305f\u3081\u3001\u305d\u308c\u3092\u5909\u6570\u306b\u5272\u308a\u5f53\u3066\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u4f8b: Java\u306eIf\u6761\u4ef6\u3002<\/p>\n
Java\u306e\u300cIf\u2026Else\u300d\u3068Scala\u306e\u300cIf\u2026Else\u300d\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n
Java\u306e\u300cIf\u2026Else\u300d\uff1aJava\u3067\u306f\u3001\u300cIf\u2026Else\u300d\u306f\u6587\u3067\u3042\u308a\u3001\u5f0f\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u5024\u3092\u8fd4\u3055\u305a\u3001\u5909\u6570\u306b\u5272\u308a\u5f53\u3066\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u305b\u3093\u3002\u4f8b\uff1a<\/p>\n
int year;\r\n if( count == 0) \r\n year = 2014;\r\n else \r\n year = 2015;\r\n<\/code><\/pre>\n\u30b9\u30ab\u30e9\u306e\u300cIf…Else\u300d: \u30b9\u30ab\u30e9\u3067\u306f\u3001\u300cIf…Else\u300d\u306f\u5f0f\u3068\u3057\u3066\u6271\u308f\u308c\u307e\u3059\u3002\u5024\u3092\u8a55\u4fa1\u3057\u3001\u5024\u3092\u8fd4\u3057\u307e\u3059\u3002\u5909\u6570\u306b\u4ee3\u5165\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
val year = if( count == 0) 2014 else 2015\r\n<\/code><\/pre>\n\u300cScala\u300d\u306e\u300cIf\u2026Else\u300d\u306fJava\u306e\u4e09\u9805\u6f14\u7b97\u5b50\u306e\u3088\u3046\u306b\u6a5f\u80fd\u3057\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u3001Scala\u306e\u300cIf\u2026Else\u300d\u3092Java\u306e\u300cIf\u2026Else\u300d\u6587\u306e\u3088\u3046\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
val year = 0\r\n if( count == 0) \r\n year = 2014 \r\n else \r\n year = 2015\r\n<\/code><\/pre>\nScala\u306f\u5f0f\u30d9\u30fc\u30b9\u306e\u8a00\u8a9e\u3067\u3059\u304b\uff1f\u305d\u308c\u3068\u3082\u6587\u30d9\u30fc\u30b9\u306e\u8a00\u8a9e\u3067\u3059\u304b\uff1fJava\u306f\u5f0f\u30d9\u30fc\u30b9\u306e\u8a00\u8a9e\u3067\u3059\u304b\uff1f\u305d\u308c\u3068\u3082\u6587\u30d9\u30fc\u30b9\u306e\u8a00\u8a9e\u3067\u3059\u304b\uff1f<\/h3>\n
Scala\u3067\u306f\u3001\u3059\u3079\u3066\u304c\u5024\u3067\u3059\u3002\u3059\u3079\u3066\u306e\u5f0f\u307e\u305f\u306f\u6587\u306f\u5024\u306b\u8a55\u4fa1\u3055\u308c\u307e\u3059\u3002\u5f0f\u3001\u95a2\u6570\u3001\u30af\u30ed\u30fc\u30b8\u30e3\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306a\u3069\u3092\u5909\u6570\u306b\u4ee3\u5165\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001Scala\u306f\u5f0f\u6307\u5411\u306e\u8a00\u8a9e\u3067\u3059\u3002\u4e00\u65b9\u3001Java\u3067\u306f\u6587\u306f\u5f0f\u3084\u5024\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u305d\u308c\u3089\u3092\u5909\u6570\u306b\u4ee3\u5165\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u3057\u305f\u304c\u3063\u3066\u3001Java\u306f\u5f0f\u6307\u5411\u306e\u8a00\u8a9e\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u6307\u5411\u306e\u8a00\u8a9e\u3067\u3059\u3002<\/p>\n
Java\u3068Scala\u306e\u3069\u3061\u3089\u306b\u306f\u5bfe\u5fdc\u3057\u3066\u3044\u308b\u304c\u3001\u4ed6\u65b9\u306b\u306f\u5bfe\u5fdc\u3057\u3066\u3044\u306a\u3044\u6a5f\u80fd\u3092\u6559\u3048\u3066\u304f\u3060\u3055\u3044\u3002<\/h3>\n\n- Java does not support Operator Overloading, but Scala supports it.<\/li>\n
- Java supports ++ and — operators , but Scala does not support them.<\/li>\n
- Java has Checked and Unchecked Exceptions, but Scala does not have Checked Exceptions.<\/li>\n
- Scala does not support break and continue statements, but Java uses them.<\/li>\n
- Scala does not have explicit Type casting, but Java supports this feature.<\/li>\n
- Scala supports Pattern Matching, but Java does not.<\/li>\n
- Java uses Primitive Data types, but Scala does not have.<\/li>\n
- Java supports static members, but Scala does not have static members concept.<\/li>\n
- Scala supports Implicits and Traits, Java does not support them.<\/li>\n<\/ul>\n
**\u6ce8\u610f\uff1a**\u3053\u306e\u30ea\u30b9\u30c8\u306f1\u30da\u30fc\u30b8\u3092\u8d85\u3048\u3066\u3044\u307e\u3059\u3002\u305f\u3060\u3057\u3001Scala\u3068Java\u306e\u7279\u5fb4\u306e\u9055\u3044\u306b\u3064\u3044\u3066\u3001Scala\u306e\u30a4\u30f3\u30bf\u30d3\u30e5\u30fc\u306b\u81e8\u3080\u969b\u306b\u899a\u3048\u3066\u304a\u304f\u3079\u304d\u91cd\u8981\u306a\u30dd\u30a4\u30f3\u30c8\u3067\u3059\u3002<\/p>\n
Scala\u306b\u304a\u3044\u3066\u3001\u300cFunction\u300d\u3068\u300cMethod\u300d\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n
\u30b9\u30ab\u30e9\u306f\u95a2\u6570\u3068\u30e1\u30bd\u30c3\u30c9\u306e\u4e21\u65b9\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u307e\u3059\u3002\u95a2\u6570\u3068\u30e1\u30bd\u30c3\u30c9\u306e\u5b9a\u7fa9\u306b\u306f\u540c\u3058\u69cb\u6587\u3092\u4f7f\u7528\u3057\u3001\u69cb\u6587\u306e\u9055\u3044\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u305f\u3060\u3057\u3001\u5c11\u3057\u7570\u306a\u308b\u70b9\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
\n- We can define a method in a Scala class or trait. Method is associated with an object (An instance of a Class). We can call a method by using an instance of a Class. We cannot use a Scala Method directly without using object.<\/li>\n
- Function is not associated with a class or trait. It is defined in a Scala Package. We can access functions without using objects, like Java\u2019s Static Methods.<\/li>\n<\/ul>\n
\u79c1\u306e\u6b21\u306e\u6295\u7a3f\u3067\u306f\u3001\u30af\u30e9\u30b9\u3001\u30c8\u30ec\u30a4\u30c8\u3001\u30d1\u30c3\u30b1\u30fc\u30b8\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306a\u3069\u306b\u3064\u3044\u3066\u8a71\u3057\u5408\u3044\u307e\u3059\u3002<\/p>\n
Scala\u306e\u30bd\u30fc\u30b9\u30d5\u30a1\u30a4\u30eb\u3067\u5b9a\u7fa9\u3067\u304d\u308b\u516c\u958b\u30af\u30e9\u30b9\u30d5\u30a1\u30a4\u30eb\u306e\u6570\u306f\u3044\u304f\u3064\u3067\u3059\u304b\uff1f<\/h3>\n
Java\u3067\u306f\u3001\u30bd\u30fc\u30b9\u30d5\u30a1\u30a4\u30eb\u5185\u306b\u6700\u5927\u30671\u3064\u306e\u516c\u958b\u30af\u30e9\u30b9\/\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4e00\u65b9\u3001Scala\u3067\u306f\u3001\u540c\u3058\u30bd\u30fc\u30b9\u30d5\u30a1\u30a4\u30eb\u5185\u3067\u8907\u6570\u306e\u516c\u958b\u30af\u30e9\u30b9\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u307e\u3059\u3002Scala\u306e\u30bd\u30fc\u30b9\u30d5\u30a1\u30a4\u30eb\u3067\u306f\u3001\u4efb\u610f\u306e\u6570\u306e\u516c\u958b\u30af\u30e9\u30b9\/\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\/\u30c8\u30ec\u30a4\u30c8\u3092\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
Java\u3068\u540c\u69d8\u306b\u3001Scala\u8a00\u8a9e\u306b\u304a\u3051\u308b\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u30a4\u30f3\u30dd\u30fc\u30c8\u306f\u3069\u308c\u3067\u3059\u304b\uff1f<\/h3>\n
\u79c1\u305f\u3061\u306f\u3001java.lang\u306fJVM\u306b\u3088\u3063\u3066\u81ea\u52d5\u7684\u306b\u3059\u3079\u3066\u306eJava\u30d7\u30ed\u30b0\u30e9\u30e0\u306b\u30a4\u30f3\u30dd\u30fc\u30c8\u3055\u308c\u308b\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u30d1\u30c3\u30b1\u30fc\u30b8\u3067\u3042\u308b\u3053\u3068\u3092\u77e5\u3063\u3066\u3044\u307e\u3059\u3002\u660e\u793a\u7684\u306b\u3053\u306e\u30d1\u30c3\u30b1\u30fc\u30b8\u3092\u30a4\u30f3\u30dd\u30fc\u30c8\u3059\u308b\u5fc5\u8981\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u540c\u69d8\u306b\u3001\u4ee5\u4e0b\u306e\u3082\u306e\u306f\u3059\u3079\u3066\u306eScala\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u4f7f\u7528\u3067\u304d\u308b\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u30a4\u30f3\u30dd\u30fc\u30c8\u3067\u3059\u3002<\/p>\n
\n- java.lang package<\/li>\n
- scala package<\/li>\n
- scala.PreDef<\/li>\n<\/ul>\n
Scala\u306b\u306f\u4f55\u4eba\u306e\u30aa\u30da\u30ec\u30fc\u30bf\u304c\u3044\u3066\u3001\u306a\u305c\u3067\u3059\u304b\uff1f<\/h3>\n
Java\u3068\u306f\u7570\u306a\u308a\u3001C++\u3068\u540c\u69d8\u306b\u3001Scala\u306f\u6f14\u7b97\u5b50\u306e\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u307e\u3059\u3002Scala\u306b\u306f\u3001\u300c=\u300d\uff08\u7b49\u53f7\uff09\u6f14\u7b97\u5b50\u3068\u3044\u3046\u552f\u4e00\u306e\u6f14\u7b97\u5b50\u304c\u3042\u308a\u307e\u3059\u3002\u4ed6\u306e\u6f14\u7b97\u5b50\u306f\u3059\u3079\u3066\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002\u305f\u3068\u3048\u3070\u30012 + 3\u3068\u3044\u3046\u5834\u5408\u3001Scala\u3067\u306f\u300c+\u300d\u306f\u6f14\u7b97\u5b50\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002Scala\u306eInt\u30af\u30e9\u30b9\u306b\u5229\u7528\u53ef\u80fd\u306a\u30e1\u30bd\u30c3\u30c9\u3068\u306a\u308a\u307e\u3059\u3002\u300cScala\u30b3\u30f3\u30d1\u30a4\u30e9\u306f2\u30683\u304c\u6574\u6570\u3067\u3042\u308b\u3053\u3068\u3092\u8a8d\u8b58\u3057\u3001Int\u30af\u30e9\u30b9\u5185\u3067\u300c+\u300d\u30e1\u30bd\u30c3\u30c9\u3092\u63a2\u3057\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001Scala\u30b3\u30f3\u30d1\u30a4\u30e9\u306f\u300c2 + 3\u300d\u3068\u3044\u3046\u5f0f\u3092\u300c2.+(3)\u300d\u306b\u5909\u63db\u3057\u3001\u6574\u6570\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u300c2\u300d\u4e0a\u3067\u300c+\u300d\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3057\u3001\u30d1\u30e9\u30e1\u30fc\u30bf\u3068\u3057\u3066\u6574\u6570\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u300c3\u300d\u3092\u6e21\u3057\u307e\u3059\u3002\u300c2 + 3\u300d\u3068\u300c2.+(3)\u300d\u306f\u540c\u3058\u3067\u3059\u3002\u3053\u308c\u306f\u5358\u306bScala\u306e\u69cb\u6587\u7cd6\u3068\u3057\u3066\u3001\u95a2\u6570\u578b\u30b9\u30bf\u30a4\u30eb\u3067\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u8a18\u8ff0\u3059\u308b\u305f\u3081\u306e\u3082\u306e\u3067\u3059\u3002\u300d<\/p>\n
Java\u3068Scala\u3067\u4f7f\u7528\u3055\u308c\u308b\u304c\u3001Scala\u3067\u306f\u5fc5\u8981\u306a\u3044\u30ad\u30fc\u30ef\u30fc\u30c9\u306b\u3064\u3044\u3066\u3044\u304f\u3064\u304b\u6319\u3052\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u306a\u305cScala\u306f\u305d\u308c\u3089\u3092\u5fc5\u8981\u3068\u3057\u306a\u3044\u306e\u3067\u3057\u3087\u3046\u304b\uff1f<\/h3>\n
Java\u306f\u4ee5\u4e0b\u306e\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u5e83\u7bc4\u306b\u4f7f\u7528\u3057\u307e\u3059:<\/p>\n
\n- \u2018public\u2019 keyword – to define classes, interfaces, variables etc.<\/li>\n
- \u2018static\u2019 keyword – to define static members.<\/li>\n<\/ul>\n
Scala\u306f\u3053\u308c\u3089\u306e2\u3064\u306e\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u5fc5\u8981\u3068\u3057\u307e\u305b\u3093\u3002Scala\u306b\u306f\u300cpublic\u300d\u304a\u3088\u3073\u300cstatic\u300d\u3068\u3044\u3046\u30ad\u30fc\u30ef\u30fc\u30c9\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n
\n- In Scala, default access modifier is \u2018public\u2019 for classes,traits, methods\/functions, fields etc. That\u2019s why, \u2018public\u2019 keyword is not required.<\/li>\n
- To support OOP principles, Scala team has avoided \u2018static\u2019 keyword. That\u2019s why Scala is a Pure-OOP Langauge. It is very tough to deal static members in Concurrency applications.<\/li>\n<\/ul>\n
Scala\u306b\u304a\u3051\u308bPreDef\u3068\u306f\u4f55\u3067\u3059\u304b\uff1fPreDef\u306e\u4e3b\u306a\u76ee\u7684\u306f\u4f55\u3067\u3059\u304b\uff1fScala\u3067\u306f\u3001PreDef\u306f\u300cscala.PreDef\u300d\u3068\u3044\u3046\u540d\u524d\u306escala\u30d1\u30c3\u30b1\u30fc\u30b8\u306b\u5b9a\u7fa9\u3055\u308c\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3059\u3002\u3053\u308c\u306f\u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3042\u308a\u3001\u4ee5\u4e0b\u306b\u793a\u3059\u3088\u3046\u306b\u591a\u304f\u306e\u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3\u30e1\u30bd\u30c3\u30c9\u3092\u5b9a\u7fa9\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\n- Console IO (print,println etc)<\/li>\n
- Collection utility methods<\/li>\n
- String utility methods<\/li>\n
- Implicit conversion methods<\/li>\n
- Assertion utility methods etc.<\/li>\n<\/ul>\n
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