{"id":325,"date":"2022-08-14T02:33:36","date_gmt":"2022-08-04T17:58:47","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/scala%e3%81%ae%e9%9d%a2%e6%8e%a5%e8%b3%aa%e5%95%8f\/"},"modified":"2025-07-31T22:40:41","modified_gmt":"2025-07-31T13:40:41","slug":"scala%e3%81%ae%e9%9d%a2%e6%8e%a5%e8%b3%aa%e5%95%8f","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/scala%e3%81%ae%e9%9d%a2%e6%8e%a5%e8%b3%aa%e5%95%8f\/","title":{"rendered":"Scala\u306e\u9762\u63a5\u8cea\u554f"},"content":{"rendered":"<p>\u3053\u306e\u6295\u7a3f\u3092\u8aad\u3080\u524d\u306b\u3001\u300cScala\u57fa\u672c\u7684\u306a\u30a4\u30f3\u30bf\u30d3\u30e5\u30fc\u306e\u8cea\u554f\u3068\u56de\u7b54\u300d\u3068\u3044\u3046\u79c1\u306e\u524d\u306e\u6295\u7a3f\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002Scala\u8a00\u8a9e\u306e\u57fa\u790e\u77e5\u8b58\u3092\u5f97\u308b\u305f\u3081\u3067\u3059\u3002\u3053\u306e\u6295\u7a3f\u3067\u306f\u3001\u7d4c\u9a13\u8c4a\u5bcc\u306aScala\u958b\u767a\u8005\u306b\u3068\u3063\u3066\u6709\u7528\u306a\u3001\u3055\u3089\u306a\u308bScala\u30a4\u30f3\u30bf\u30d3\u30e5\u30fc\u306e\u8cea\u554f\u306b\u3064\u3044\u3066\u8a71\u3057\u5408\u3044\u307e\u3059\u3002\u6ce8\u610f\uff1a\u3053\u306e\u30ea\u30b9\u30c8\u306f\u65e2\u306b\u975e\u5e38\u306b\u9577\u304f\u306a\u3063\u3066\u3044\u308b\u305f\u3081\u3001\u6b8b\u308a\u306e\u8cea\u554f\u3068\u56de\u7b54\u3092\u542b\u3080\u5225\u306e\u6295\u7a3f\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002\u305d\u306e\u6295\u7a3f\u306f\u300cScala\u4e2d\u7d1a\u304a\u3088\u3073\u4e0a\u7d1a\u30a4\u30f3\u30bf\u30d3\u30e5\u30fc\u306e\u8cea\u554f\u3068\u56de\u7b54\u300d\u3092\u53c2\u7167\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h2>\u4ee5\u4e0b\u306f\u3001\u30b9\u30ab\u30e9\u30a4\u30f3\u30bf\u30d3\u30e5\u30fc\u306e\u8cea\u554f\u3067\u3059\u3002<\/h2>\n<p>\u3053\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u3059\u3079\u3066\u306eScala\u306e\u4e2d\u7d1a\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\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u30d7\u30e9\u30a4\u30de\u30ea\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f\u30b9\u30ab\u30e9\u306b\u304a\u3051\u308b\u30bb\u30ab\u30f3\u30c0\u30ea\u307e\u305f\u306f\u88dc\u52a9\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306f\u4f55\u3067\u3059\u304b\uff1f<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u30b9\u30ab\u30e9\u306b\u304a\u3051\u308b\u88dc\u52a9\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u4f7f\u7528\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\uff1f\u30b9\u30ab\u30e9\u306b\u304a\u3051\u308b\u88dc\u52a9\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u5b9a\u7fa9\u306b\u306f\u3069\u306e\u3088\u3046\u306a\u30eb\u30fc\u30eb\u304c\u3042\u308a\u307e\u3059\u304b\uff1f<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>Scala\u306b\u304a\u3051\u308bArray\u3068ArrayBuffer\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u30b1\u30fc\u30b9\u30af\u30e9\u30b9\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f \u30b1\u30fc\u30b9\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f \u30b1\u30fc\u30b9\u30af\u30e9\u30b9\u306e\u5229\u70b9\u306f\u4f55\u3067\u3059\u304b\uff1f<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u30b1\u30fc\u30b9\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\uff08\u901a\u5e38\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\uff09\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u901a\u5e38\u306e\u30af\u30e9\u30b9\u3068\u6bd4\u8f03\u3057\u3066\u3001\u30b1\u30fc\u30b9\u30af\u30e9\u30b9\u306e\u4e3b\u306a\u5229\u70b9\u3084\u30e1\u30ea\u30c3\u30c8\u306f\u4f55\u3067\u3059\u304b\uff1f<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>Scala\u306b\u304a\u3051\u308bisInstanceOf\u30e1\u30bd\u30c3\u30c9\u3068asInstanceOf\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u7528\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\uff1fJava\u306b\u306f\u985e\u4f3c\u306e\u30b3\u30f3\u30bb\u30d7\u30c8\u304c\u3042\u308a\u307e\u3059\u304b\uff1f<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u306f\u3001\u30b1\u30fc\u30b9\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u53ef\u80fd\u3067\u3042\u308a\u3001\u901a\u5e38\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u305d\u3046\u3067\u306f\u306a\u3044\u3053\u3068\u3092\u3069\u306e\u3088\u3046\u306b\u8a3c\u660e\u3057\u307e\u3059\u304b\uff1f<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>Scala\u306b\u304a\u3051\u308bArray\u3068List\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>Scala\u306b\u304a\u3051\u308b\u300cval\u300d\u3068\u300clazy val\u300d\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f \u30a4\u30fc\u30ac\u30fc\u8a55\u4fa1\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f \u30ec\u30a4\u30b8\u30fc\u8a55\u4fa1\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>Scala\u306eequals\u30e1\u30bd\u30c3\u30c9\u3068==\u306e\u95a2\u4fc2\u306f\u4f55\u3067\u3059\u304b\uff1fScala\u306e==\u3068Java\u306e==\u6f14\u7b97\u5b50\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>Scala\u306e\u5185\u90e8\u30af\u30e9\u30b9\u3068Java\u306e\u5185\u90e8\u30af\u30e9\u30b9\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u30c0\u30a4\u30e4\u30e2\u30f3\u30c9\u306e\u554f\u984c\u3068\u306f\u4f55\u3067\u3059\u304b\uff1fScala\u306f\u30c0\u30a4\u30e4\u30e2\u30f3\u30c9\u306e\u554f\u984c\u3092\u3069\u306e\u3088\u3046\u306b\u89e3\u6c7a\u3057\u307e\u3059\u304b\uff1f<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u306a\u305cScala\u306b\u306f\u300cstatic\u300d\u30ad\u30fc\u30ef\u30fc\u30c9\u304c\u306a\u3044\u306e\u3067\u3059\u304b\uff1f \u3053\u306e\u6c7a\u5b9a\u306e\u4e3b\u306a\u7406\u7531\u306f\u4f55\u3067\u3059\u304b\uff1f<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>Scala\u306b\u304a\u3051\u308b\u300cobject\u300d\u30ad\u30fc\u30ef\u30fc\u30c9\u306e\u5229\u7528\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\uff1fScala\u3067\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3059\u308b\u65b9\u6cd5\u306f\uff1f<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>Scala\u306b\u304a\u3051\u308bobject\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u3066\u30d5\u30a1\u30af\u30c8\u30ea\u30e1\u30bd\u30c3\u30c9\u3092\u5b9a\u7fa9\u3059\u308b\u65b9\u6cd5\u306f\uff1f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u30d5\u30a1\u30af\u30c8\u30ea\u30e1\u30bd\u30c3\u30c9\u3092\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u306e\u5229\u70b9\u306f\u4f55\u3067\u3059\u304b\uff1f<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>Scala\u306b\u304a\u3051\u308bapply\u30e1\u30bd\u30c3\u30c9\u3068unapply\u30e1\u30bd\u30c3\u30c9\u306f\u4f55\u3067\u3059\u304b\uff1fScala\u306b\u304a\u3051\u308bapply\u30e1\u30bd\u30c3\u30c9\u3068unapply\u30e1\u30bd\u30c3\u30c9\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>Scala\u3067new\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u305b\u305a\u306b\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u4f5c\u6210\u3059\u308b\u5834\u5408\u3001\u5185\u90e8\u3067\u3069\u306e\u3088\u3046\u306b\u52d5\u4f5c\u3057\u307e\u3059\u304b\uff1f\u3069\u306e\u3088\u3046\u306a\u5834\u5408\u306b\u3053\u306e\u30a2\u30d7\u30ed\u30fc\u30c1\u3092\u9078\u3073\u307e\u3059\u304b\uff1f<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>Scala\u3067\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u306a\u30d7\u30e9\u30a4\u30de\u30ea\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u5ba3\u8a00\u3059\u308b\u65b9\u6cd5\u306f\uff1fScala\u3067\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u306a\u30d7\u30e9\u30a4\u30de\u30ea\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3078\u306e\u547c\u3073\u51fa\u3057\u65b9\u306f\uff1f<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u30b3\u30f3\u30d1\u30cb\u30aa\u30f3\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u305d\u306e\u30b3\u30f3\u30d1\u30cb\u30aa\u30f3\u30af\u30e9\u30b9\u306e\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u30e1\u30f3\u30d0\u30fc\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u307e\u3059\u304b\uff1f<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>Scala\u306b\u304a\u3051\u308b\u30af\u30e9\u30b9\u3068\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u3044\u30462\u3064\u306e\u7570\u306a\u308b\u30ad\u30fc\u30ef\u30fc\u30c9\u306e\u4e3b\u306a\u30c7\u30b6\u30a4\u30f3\u6c7a\u5b9a\u306f\u4f55\u3067\u3059\u304b\uff1f\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30e1\u30f3\u30d0\u30fc\u3068\u9759\u7684\u30e1\u30f3\u30d0\u30fc\u3092Scala\u3067\u3069\u306e\u3088\u3046\u306b\u5b9a\u7fa9\u3057\u307e\u3059\u304b\uff1f<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>Scala\u306b\u304a\u3051\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3059\u304b\u3001\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3067\u3059\u304b\uff1f<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>Scala\u306b\u304a\u3051\u308b\u30b3\u30f3\u30d1\u30cb\u30aa\u30f3\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u306f\u4f55\u3067\u3059\u304b\uff1fScala\u306b\u304a\u3051\u308b\u30b3\u30f3\u30d1\u30cb\u30aa\u30f3\u30af\u30e9\u30b9\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f\u30b3\u30f3\u30d1\u30cb\u30aa\u30f3\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5229\u7528\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\uff1f<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>Scala\u3067\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9f\u88c5\u3059\u308b\u65b9\u6cd5\u306f\uff1f<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>Scala\u306b\u304a\u3051\u308b\u7bc4\u56f2\uff08Range\uff09\u3068\u306f\u4f55\u3067\u3059\u304b\uff1fScala\u3067\u7bc4\u56f2\u3092\u4f5c\u6210\u3059\u308b\u65b9\u6cd5\u306f\uff1f<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>Scala\u306b\u304a\u3051\u308b\u578bNothing\u306e\u5024\u306f\u3044\u304f\u3064\u3042\u308a\u307e\u3059\u304b\uff1f<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>Scala\u306b\u304a\u3051\u308b\u578bUnit\u306e\u5024\u306f\u3044\u304f\u3064\u3042\u308a\u307e\u3059\u304b\uff1f<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>Scala\u306b\u304a\u3051\u308b\u7bc4\u56f2\uff08Range\uff09\u3068\u306f\u4f55\u3067\u3059\u304b\uff1fScala\u3067\u7bc4\u56f2\u3092\u4f5c\u6210\u3059\u308b\u65b9\u6cd5\u306f\uff1f<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u95a2\u6570\u578b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3067\u306f\u3001\u95a2\u6570\u3068\u624b\u7d9a\u304d\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>Scala\u306e\u88dc\u52a9\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3068Java\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u4e3b\u306a\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>Scala\u306efor-comprehension\u69cb\u6587\u306b\u304a\u3051\u308b\u300cyield\u300d\u30ad\u30fc\u30ef\u30fc\u30c9\u306e\u5229\u7528\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\uff1f<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>Scala\u306efor-comprehension\u69cb\u6587\u306b\u304a\u3051\u308b\u30ac\u30fc\u30c9\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>Scala\u306fJava 8\u3088\u308a\u3082\u7c21\u5358\u306b\u7d99\u627f\u30c0\u30a4\u30e4\u30e2\u30f3\u30c9\u554f\u984c\u3092\u89e3\u6c7a\u3059\u308b\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\uff1f<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>Scala\u3067\u306f\u3001\u30d1\u30bf\u30fc\u30f3\u30de\u30c3\u30c1\u30f3\u30b0\u306f\u3069\u306e\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306b\u5f93\u3044\u307e\u3059\u304b\uff1fJava\u3067\u306fisinstanceof\u6f14\u7b97\u5b50\u306f\u3069\u306e\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306b\u5f93\u3044\u307e\u3059\u304b\uff1f<\/ol>\n<h3>\u30b9\u30ab\u30e9\u30a4\u30f3\u30bf\u30d3\u30e5\u30fc\u306e\u8cea\u554f\u3068\u56de\u7b54<\/h3>\n<p>\u3053\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u4e0a\u8a18\u306e\u30ea\u30b9\u30c8\u304b\u3089\u5168\u3066\u306e\u8cea\u554f\u3092\u53d6\u308a\u4e0a\u3052\u3001\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u9069\u5207\u306a\u4f8b\u3092\u7528\u3044\u3066\u8a73\u3057\u304f\u8aac\u660e\u3057\u307e\u3059\u3002\u3082\u3057\u4f8b\u3092\u4f7f\u3063\u3066\u3053\u308c\u3089\u306e\u6982\u5ff5\u3092\u6df1\u304f\u7406\u89e3\u3057\u305f\u3044\u5834\u5408\u306f\u3001Scala\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u30bb\u30af\u30b7\u30e7\u30f3\u306e\u79c1\u306e\u4ee5\u524d\u306e\u6295\u7a3f\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n<h3>Scala\u306b\u304a\u3051\u308b\u30d7\u30e9\u30a4\u30de\u30ea\u30fc\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3068\u306f\u4f55\u3067\u3059\u304b\uff1fScala\u306b\u304a\u3051\u308b\u30bb\u30ab\u30f3\u30c0\u30ea\u30fc\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u307e\u305f\u306f\u88dc\u52a9\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3068\u306f\u4f55\u3067\u3059\u304b\uff1fScala\u306b\u304a\u3051\u308b\u88dc\u52a9\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u76ee\u7684\u306f\u4f55\u3067\u3059\u304b\uff1fScala\u306b\u304a\u3044\u3066\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u3059\u308b\u3053\u3068\u306f\u53ef\u80fd\u3067\u3059\u304b\uff1f<\/h3>\n<p>\u30b9\u30ab\u30e9\u306b\u306f2\u7a2e\u985e\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<ul class=\"post-ul\">\n<li>Primary Constructor<\/li>\n<li>Auxiliary Constructor<\/li>\n<\/ul>\n<p>Scala\u306e\u30d7\u30e9\u30a4\u30de\u30ea\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306f\u3001\u30af\u30e9\u30b9\u5b9a\u7fa9\u3068\u4e00\u7dd2\u306b\u5b9a\u7fa9\u3055\u308c\u308b\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3067\u3059\u3002\u3059\u3079\u3066\u306e\u30af\u30e9\u30b9\u306f\u3001\u30d1\u30e9\u30e1\u30fc\u30bf\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u307e\u305f\u306f\u30d1\u30e9\u30e1\u30fc\u30bf\u306a\u3057\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u3044\u305a\u308c\u304b\u3092\u6301\u3064\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u4f8b\uff1a<\/p>\n<pre class=\"post-pre\"><code>class Person\r\n<\/code><\/pre>\n<p>\u4e0a\u8a18\u306ePerson\u30af\u30e9\u30b9\u306b\u306f\u3001\u3053\u306e\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u4f5c\u6210\u3059\u308b\u305f\u3081\u306e\u30bc\u30ed\u30d1\u30e9\u30e1\u30fc\u30bf\u307e\u305f\u306f\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u306a\u3044\u30d7\u30e9\u30a4\u30de\u30ea\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>class Person (firstName: String, lastName: String)\r\n<\/code><\/pre>\n<p>\u4e0a\u8a18\u306ePerson\u30af\u30e9\u30b9\u306b\u306f\u3001\u3053\u306e\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u4f5c\u6210\u3059\u308b\u305f\u3081\u306e2\u3064\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u30fc\u3092\u6301\u3064\u4e3b\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u30fc\u304c\u3042\u308a\u307e\u3059\u3002\u88dc\u52a9\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306f\u3001\u88dc\u52a9\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3068\u3082\u547c\u3070\u308c\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u793a\u3059\u3088\u3046\u306b\u3001def\u30ad\u30fc\u30ef\u30fc\u30c9\u3068this\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\u88dc\u52a9\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u5ba3\u8a00\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>class Person (firstName: String, middleName:String, lastName: String){\r\n  def this(firstName: String, lastName: String){\r\n      this(firstName, \"\", lastName)\r\n  }\r\n}\r\n<\/code><\/pre>\n<h3>\u30b9\u30ab\u30e9\u306b\u304a\u3051\u308b\u88dc\u52a9\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u5229\u7528\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\uff1fScala\u3067\u88dc\u52a9\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u5b9a\u7fa9\u3059\u308b\u969b\u306b\u306f\u3001\u3069\u306e\u3088\u3046\u306a\u30eb\u30fc\u30eb\u306b\u5f93\u3046\u3079\u304d\u3067\u3059\u304b\uff1f<\/h3>\n<p>Scala\u3067\u306f\u3001\u88dc\u52a9\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u4e3b\u306a\u76ee\u7684\u306f\u3001\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u3059\u308b\u3053\u3068\u3067\u3059\u3002Java\u3068\u540c\u69d8\u306b\u3001\u3055\u307e\u3056\u307e\u306a\u7a2e\u985e\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u63d0\u4f9b\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u306e\u3067\u3001\u4f7f\u7528\u8005\u306f\u81ea\u8eab\u306e\u8981\u4ef6\u306b\u57fa\u3065\u3044\u3066\u9069\u5207\u306a\u3082\u306e\u3092\u9078\u629e\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u88dc\u52a9\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u30eb\u30fc\u30eb\uff1a<\/p>\n<ul class=\"post-ul\">\n<li>They are like methods only. Like methods, we should use \u2018def\u2019 keyword to define them.<\/li>\n<li>We should use same name \u2018this\u2019 for all Auxiliary Constructors.<\/li>\n<li>Each Auxiliary Constructor should start with a call to previous defined another Auxiliary Constructor or Primary Constructor. Otherwise compile-time error.<\/li>\n<li>Each Auxiliary Constructor should differ with their parameters list: may be by number or types.<\/li>\n<li>Auxiliary Constructors cannot call a super class constructors. They should call them through Primary Constructor only.<\/li>\n<li>All Auxiliary Constructors call their Primary Constructor either directly or indirectly through other Auxiliary Constructors.<\/li>\n<\/ul>\n<p>\u300cScala\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306b\u3064\u3044\u3066\u5b66\u3073\u305f\u3044\u5834\u5408\u306f\u3001\u79c1\u306eScala\u306e\u8a18\u4e8b\u3092\u53c2\u7167\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u30d7\u30e9\u30a4\u30de\u30ea\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3068\u88dc\u52a9\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u304c\u3042\u308a\u307e\u3059\u3002\u300d<\/p>\n<h3>Scala\u306b\u304a\u3044\u3066\u3001Array\u3068ArrayBuffer\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n<p>\u30b9\u30ab\u30e9\u306b\u304a\u3051\u308bArray\u3068ArrayBuffer\u306e\u9055\u3044\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n<ul class=\"post-ul\">\n<li>Array is fixed size array. We cannot change its size once its created.<\/li>\n<li>ArrayBuffer is variable size array. It can increase or decrease it\u2019s size dynamically.<\/li>\n<li>Array is something similar to Java\u2019s primitive arrays.<\/li>\n<li>ArrayBuffer is something similar to Java\u2019s ArrayList.<\/li>\n<\/ul>\n<h3>\u30b1\u30fc\u30b9\u30af\u30e9\u30b9\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f\u30b1\u30fc\u30b9\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f\u30b1\u30fc\u30b9\u30af\u30e9\u30b9\u306e\u5229\u70b9\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n<p>\u30b1\u30fc\u30b9\u30af\u30e9\u30b9\u306f\u3001\u300ccase class\u300d\u3068\u3044\u3046\u30ad\u30fc\u30ef\u30fc\u30c9\u3067\u5b9a\u7fa9\u3055\u308c\u305f\u30af\u30e9\u30b9\u3067\u3059\u3002\u30b1\u30fc\u30b9\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u3001\u300ccase object\u300d\u3068\u3044\u3046\u30ad\u30fc\u30ef\u30fc\u30c9\u3067\u5b9a\u7fa9\u3055\u308c\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3059\u3002\u3053\u306e\u300ccase\u300d\u30ad\u30fc\u30ef\u30fc\u30c9\u306e\u304a\u304b\u3052\u3067\u3001\u5197\u9577\u306a\u30b3\u30fc\u30c9\u3092\u56de\u907f\u3059\u308b\u305f\u3081\u306e\u3044\u304f\u3064\u304b\u306e\u5229\u70b9\u304c\u5f97\u3089\u308c\u307e\u3059\u3002\u79c1\u305f\u3061\u306f\u300cnew\u300d\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u305b\u305a\u306b\u30b1\u30fc\u30b9\u30af\u30e9\u30b9\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u306f\u3001Scala\u30b3\u30f3\u30d1\u30a4\u30e9\u306f\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u306b\u5bfe\u3057\u3066\u300cval\u300d\u3068\u3044\u3046\u30d7\u30ec\u30d5\u30a3\u30c3\u30af\u30b9\u3092\u4ed8\u3051\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u30b1\u30fc\u30b9\u30af\u30e9\u30b9\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u306f\u3001\u666e\u901a\u306e\u30af\u30e9\u30b9\u3067\u306f\u4e0d\u53ef\u80fd\u3067\u3059\u304c\u3001val\u307e\u305f\u306fvar\u3092\u4f7f\u7528\u305b\u305a\u306b\u30af\u30e9\u30b9\u30e1\u30f3\u30d0\u30fc\u306b\u306a\u308a\u307e\u3059\u3002\u30b1\u30fc\u30b9\u30af\u30e9\u30b9\u306e\u5229\u70b9\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n<ul class=\"post-ul\">\n<li>By default, Scala Compiler adds toString, hashCode and equals methods. We can avoid writing this boilerplate code.<\/li>\n<li>By default, Scala Compiler adds companion object with apply and unapply methods that\u2019s why we don\u2019t need new keyword to create instances of a case class.<\/li>\n<li>By default, Scala Compiler adds copy method too.<\/li>\n<li>We can use case classes in Pattern Matching.<\/li>\n<li>By default, Case class and Case Objects are Serializable.<\/li>\n<\/ul>\n<h3>\u30b1\u30fc\u30b9\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u901a\u5e38\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\uff08\u666e\u901a\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\uff09\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n<ul class=\"post-ul\">\n<li>Normal object is created using \u201cobject\u201d keyword. By default, It\u2019s a singleton object.<\/li>\n<\/ul>\n<pre class=\"post-pre\"><code>object MyNormalObject\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\n<li>Case Object is created using \u201ccase object\u201d keywords.By default, It\u2019s also a singleton object<\/li>\n<\/ul>\n<pre class=\"post-pre\"><code>case object MyCaseObject\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\n<li>By Default, Case Object gets toString and hashCode methods. But normal object cannot.<\/li>\n<li>By Default, Case Object is Serializable. But normal object is not.<\/li>\n<\/ul>\n<h3>\u901a\u5e38\u306e\u30af\u30e9\u30b9\u3068\u6bd4\u8f03\u3059\u308b\u3068\u3001\u30b1\u30fc\u30b9\u30af\u30e9\u30b9\u306e\u4e3b\u306a\u5229\u70b9\u3084\u30e1\u30ea\u30c3\u30c8\u306f\u4f55\u3067\u3059\u304b\uff1f (Ts\u016bj\u014d no kurasu to hikaku suru to, k\u0113su kurasu no shuy\u014d riten ya meritto wa nanidesu ka?)<\/h3>\n<p>\u4ee5\u4e0b\u306fCase\u30af\u30e9\u30b9\u304c\u901a\u5e38\u306e\u30af\u30e9\u30b9\u306b\u6bd4\u3079\u3066\u6301\u3064\u4e3b\u306a\u5229\u70b9\u307e\u305f\u306f\u30e1\u30ea\u30c3\u30c8\u3067\u3059\uff1a<\/p>\n<ul class=\"post-ul\">\n<li>Avoids lots of boiler-plate code by adding some useful methods automatically.<\/li>\n<li>By default, supports Immutability because it\u2019s parameters are \u2018val\u2019<\/li>\n<li>Easy to use in Pattern Matching.<\/li>\n<li>No need to use \u2018new\u2019 keyword to create instance of Case Class.<\/li>\n<li>By default, supports Serialization and Deserialization.<\/li>\n<\/ul>\n<h3>Scala\u306b\u304a\u3051\u308bisInstanceOf\u3068asInstanceOf\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u7528\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\uff1fJava\u306b\u306f\u985e\u4f3c\u306e\u6982\u5ff5\u306f\u3042\u308a\u307e\u3059\u304b\uff1f<\/h3>\n<p>isInstanceOf\u30e1\u30bd\u30c3\u30c9\u3068asInstanceOf\u30e1\u30bd\u30c3\u30c9\u306e\u4e21\u65b9\u306fAny\u30af\u30e9\u30b9\u3067\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u3053\u308c\u3089\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u4ed6\u306e\u30af\u30e9\u30b9\u3084\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u53d6\u308a\u8fbc\u3080\u305f\u3081\u306b\u306f\u30a4\u30f3\u30dd\u30fc\u30c8\u3059\u308b\u5fc5\u8981\u306f\u3042\u308a\u307e\u305b\u3093\u3002&#8221;isInstanceOf&#8221;\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u6307\u5b9a\u3055\u308c\u305f\u578b\u3067\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u30c6\u30b9\u30c8\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u3082\u3057\u6307\u5b9a\u3055\u308c\u305f\u578b\u3067\u3042\u308c\u3070\u3001true\u3092\u8fd4\u3057\u307e\u3059\u3002\u305d\u3046\u3067\u306a\u3051\u308c\u3070\u3001false\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>   scala&gt; val str = \"Hello\"\r\n   \r\n   scala&gt;str.isInstanceOf[String]\r\n   res0: Boolean = false   \r\n \r\n<\/code><\/pre>\n<p>\u6307\u5b9a\u3055\u308c\u305f\u578b\u306b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u30ad\u30e3\u30b9\u30c8\u3059\u308b\u305f\u3081\u306b\u3001&#8221;asInstanceOf&#8221;\u30e1\u30bd\u30c3\u30c9\u304c\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u3082\u3057\u6307\u5b9a\u3055\u308c\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u578b\u304c\u540c\u3058\u3067\u3042\u308c\u3070\u3001\u6307\u5b9a\u3055\u308c\u305f\u578b\u306b\u30ad\u30e3\u30b9\u30c8\u3057\u307e\u3059\u3002\u305d\u308c\u4ee5\u5916\u306e\u5834\u5408\u3001java.lang.ClassCastException\u304c\u30b9\u30ed\u30fc\u3055\u308c\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code> scala&gt; val str = \"Hello\".asInstanceOf[String]\r\n str: String = Hello\r\n \r\n<\/code><\/pre>\n<p>Java\u306e\u5834\u5408\u3001&#8217;instanceof&#8217;\u30ad\u30fc\u30ef\u30fc\u30c9\u306fScala\u306e&#8217;isInstanceOf&#8217;\u30e1\u30bd\u30c3\u30c9\u306b\u4f3c\u3066\u3044\u307e\u3059\u3002Java\u306e\u5834\u5408\u3001\u6b21\u306e\u3088\u3046\u306a\u624b\u52d5\u306e\u578b\u30ad\u30e3\u30b9\u30c8\u306fScala\u306e&#8217;asInstanceOf&#8217;\u30e1\u30bd\u30c3\u30c9\u306b\u4f3c\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>AccountService service = (AccountService)\r\n context.getBean(\"accountService\");\r\n<\/code><\/pre>\n<h3>\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u3001Case Object \u306f Serializable \u3067\u3042\u308a\u3001Normal Object \u306f\u305d\u3046\u3067\u306f\u306a\u3044\u3053\u3068\u3092\u3069\u306e\u3088\u3046\u306b\u8a3c\u660e\u3057\u307e\u3059\u304b\uff1f<\/h3>\n<p>\u306f\u3044\u3001\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u306f\u3001\u30b1\u30fc\u30b9\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u53ef\u80fd\u3067\u3059\u3002\u3057\u304b\u3057\u3001\u901a\u5e38\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u305d\u3046\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u4ee5\u4e0b\u306b\u793a\u3059\u3088\u3046\u306b\u3001isInstanceOf\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3053\u308c\u3092\u8a3c\u660e\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>scala&gt; object MyNormalObject\r\ndefined object MyNormalObject\r\n\r\nscala&gt; MyNormalObject.isInstanceOf[Serializable]\r\nres0: Boolean = false\r\n\r\nscala&gt; case object MyCaseObject\r\ndefined object MyCaseObject\r\n\r\nscala&gt; MyCaseObject.isInstanceOf[Serializable]\r\nres1: Boolean = true\r\n<\/code><\/pre>\n<h3>Scala\u306b\u304a\u3051\u308bArray\u3068List\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n<ul class=\"post-ul\">\n<li>Arrays are always Mutable where as List is always Immutable.<\/li>\n<li>Once created, We can change Array values where as we cannot change List Object.<\/li>\n<li>Arrays are fixed-size data structures where as List is variable-sized data structures. List\u2019s size is automatically increased or decreased based on it\u2019s operations we perform on it.<\/li>\n<li>Arrays are Invariants where as Lists are Covariants.<\/li>\n<\/ul>\n<p>\u3082\u3057\u3001Invariant\u3068Covariant\u306b\u3064\u3044\u3066\u81ea\u4fe1\u304c\u306a\u3044\u5834\u5408\u306f\u3001Scala\u30a4\u30f3\u30bf\u30d3\u30e5\u30fc\u306e\u8cea\u554f\u306b\u95a2\u3057\u3066\u306f\u3001\u79c1\u306e\u6b21\u306e\u6295\u7a3f\u3092\u8aad\u3093\u3067\u304f\u3060\u3055\u3044\u3002<\/p>\n<h3>\u300cval\u300d\u3068\u300clazy val\u300d\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f\u30a4\u30fc\u30ac\u30fc\u8a55\u4fa1\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f\u30ec\u30a4\u30b8\u30fc\u8a55\u4fa1\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n<p>\u79c1\u305f\u3061\u306f\u79c1\u306e\u57fa\u672c\u7684\u306aScala\u30a4\u30f3\u30bf\u30d3\u30e5\u30fc\u306e\u8cea\u554f\u3067\u8a71\u3057\u5408\u3063\u305f\u3088\u3046\u306b\u3001\u300cval\u300d\u306f\u5024\u307e\u305f\u306f\u5b9a\u6570\u3092\u610f\u5473\u3057\u3001\u30a4\u30df\u30e5\u30fc\u30bf\u30d6\u30eb\u306a\u5909\u6570\u3092\u5b9a\u7fa9\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u8a55\u4fa1\u306b\u306f2\u7a2e\u985e\u3042\u308a\u307e\u3059\u3002<\/p>\n<ul class=\"post-ul\">\n<li>Eager Evaluation<\/li>\n<li>Lazy Evaluation<\/li>\n<\/ul>\n<p>\u30a4\u30fc\u30ac\u30fc\u8a55\u4fa1\u306f\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u307e\u305f\u306f\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u5c55\u958b\u6642\u306b\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c\u305d\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u306b\u95a2\u4fc2\u306a\u304f\u8a55\u4fa1\u3055\u308c\u308b\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002\u30ec\u30a4\u30b8\u30fc\u8a55\u4fa1\u306f\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c\u30d7\u30ed\u30b0\u30e9\u30e0\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u5834\u5408\u306b\u306e\u307f\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u5b9f\u884c\u6642\u306b\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u8a55\u4fa1\u3059\u308b\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002 \u300cval\u300d\u3068\u300clazy val\u300d\u306e\u9055\u3044\u306f\u3001\u300cval\u300d\u306f\u7a4d\u6975\u7684\u306b\u8a55\u4fa1\u3055\u308c\u308b\u5909\u6570\u3092\u5b9a\u7fa9\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u3001\u307e\u305f\u300clazy val\u300d\u3082\u5909\u6570\u3092\u5b9a\u7fa9\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u304c\u3001\u9045\u5ef6\u8a55\u4fa1\u304c\u884c\u308f\u308c\u307e\u3059\u3002<\/p>\n<h3>Scala\u306b\u304a\u3044\u3066equals\u30e1\u30bd\u30c3\u30c9\u3068==\u306e\u95a2\u4fc2\u306f\u4f55\u3067\u3059\u304b\uff1f Scala\u306e==\u3068Java\u306e==\u6f14\u7b97\u5b50\u306e\u9055\u3044\u3092\u8aac\u660e\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/h3>\n<p>Scala\u3067\u306f\u30012\u3064\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u307e\u305f\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u6bd4\u8f03\u3059\u308b\u969b\u306bequals()\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3059\u5fc5\u8981\u306f\u3042\u308a\u307e\u305b\u3093\u3002Scala\u3067\u306f\u3001==\u3092\u4f7f\u7528\u3057\u30662\u3064\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u6bd4\u8f03\u3059\u308b\u3068\u3001\u81ea\u52d5\u7684\u306b\u305d\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306eequals()\u30e1\u30bd\u30c3\u30c9\u304c\u547c\u3073\u51fa\u3055\u308c\u307e\u3059\u3002Java\u306e==\u6f14\u7b97\u5b50\u306f\u30012\u3064\u306e\u53c2\u7167\u304c\u540c\u3058\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u6307\u3057\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002Scala\u306e==\u306f\u30012\u3064\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u7b49\u3057\u3044\u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n<h3>Scala\u306e\u5185\u90e8\u30af\u30e9\u30b9\u3068Java\u306e\u5185\u90e8\u30af\u30e9\u30b9\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n<p>Java\u3067\u306f\u3001\u5185\u90e8\u30af\u30e9\u30b9\u306f\u5916\u90e8\u30af\u30e9\u30b9\u3068\u95a2\u9023\u4ed8\u3051\u3089\u308c\u307e\u3059\u3002\u5185\u90e8\u30af\u30e9\u30b9\u306f\u3001\u5916\u90e8\u30af\u30e9\u30b9\u306e\u30e1\u30f3\u30d0\u30fc\u3067\u3059\u3002\u3057\u304b\u3057\u3001Scala\u3067\u306f\u3001\u5916\u90e8\u30af\u30e9\u30b9\u3068\u5185\u90e8\u30af\u30e9\u30b9\u306e\u95a2\u4fc2\u306f\u7570\u306a\u308a\u307e\u3059\u3002Scala\u306e\u5185\u90e8\u30af\u30e9\u30b9\u306f\u3001\u5916\u90e8\u30af\u30e9\u30b9\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u95a2\u9023\u4ed8\u3051\u3089\u308c\u307e\u3059\u3002<\/p>\n<h3>\u30c0\u30a4\u30e4\u30e2\u30f3\u30c9\u554f\u984c\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f\u30b9\u30ab\u30e9\u306f\u30c0\u30a4\u30e4\u30e2\u30f3\u30c9\u554f\u984c\u3092\u3069\u306e\u3088\u3046\u306b\u89e3\u6c7a\u3057\u307e\u3059\u304b\uff1f<\/h3>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/65648781daa94e2bdf7ba97e\/56-0.png\" alt=\"scala interview questions\" \/><\/div>\n<pre class=\"post-pre\"><code>trait A{   \r\n  def display(){ println(\"From A.display\")  }\r\n}\r\ntrait B extends A{ \r\n  override def display() { println(\"From B.display\") }\r\n}\r\ntrait C extends A{ \r\n  override def display() { println(\"From C.display\") }\r\n}\r\nclass D extends B with C{ }\r\n\r\nobject ScalaDiamonProblemTest extends App {\r\n    val d = new D\r\n    d display\r\n}\r\n<\/code><\/pre>\n<p>\u300c\u3053\u3053\u3067\u306e\u51fa\u529b\u306f\u3001C\u306e\u30c8\u30ec\u30a4\u30c8\u304b\u3089 &#8220;From C.display&#8221; \u3068\u3044\u3046\u5f62\u5f0f\u3067\u3059\u3002Scala\u30b3\u30f3\u30d1\u30a4\u30e9\u306f\u3001\u53f3\u304b\u3089\u5de6\u306b &#8220;extends B with C&#8221; \u3092\u8aad\u307f\u53d6\u308a\u3001\u4e00\u756a\u5de6\u306b\u3042\u308bC\u3068\u3044\u3046\u30c8\u30ec\u30a4\u30c8\u304b\u3089 &#8220;display&#8221; \u30e1\u30bd\u30c3\u30c9\u306e\u5b9a\u7fa9\u3092\u53d6\u308a\u307e\u3059\u3002\u6ce8\u610f\uff1a\u3053\u306e\u8a73\u3057\u3044\u8aac\u660e\u3092\u77e5\u308b\u306b\u306f\u3001\u79c1\u306e\u300cScala Traits in Depth\u300d\u306e\u6295\u7a3f\u3092\u53c2\u7167\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u300d<\/p>\n<h3>\u306a\u305cScala\u306b\u300cstatic\u300d\u30ad\u30fc\u30ef\u30fc\u30c9\u304c\u5b58\u5728\u3057\u306a\u3044\u306e\u304b\uff1f\u3053\u306e\u6c7a\u5b9a\u306e\u4e3b\u306a\u7406\u7531\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n<p>\u6211\u3005\u304c\u77e5\u3063\u3066\u3044\u308b\u3088\u3046\u306b\u3001Scala\u306b\u306f\u300cstatic\u300d\u3068\u3044\u3046\u30ad\u30fc\u30ef\u30fc\u30c9\u306f\u5b58\u5728\u3057\u307e\u305b\u3093\u3002\u3053\u308c\u306fScala\u30c1\u30fc\u30e0\u306e\u8a2d\u8a08\u4e0a\u306e\u6c7a\u5b9a\u3067\u3059\u3002\u3053\u306e\u6c7a\u5b9a\u3092\u4e0b\u3057\u305f\u4e3b\u306a\u7406\u7531\u306f\u3001Scala\u3092\u7d14\u7c8b\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u8a00\u8a9e\u306b\u3059\u308b\u305f\u3081\u3067\u3059\u3002\u300cstatic\u300d\u3068\u3044\u3046\u30ad\u30fc\u30ef\u30fc\u30c9\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u305b\u305a\u306b\u30af\u30e9\u30b9\u306e\u30e1\u30f3\u30d0\u30fc\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002\u3053\u308c\u306f\u5b8c\u5168\u306bOOP\u306e\u539f\u5247\u306b\u53cd\u3057\u3066\u3044\u307e\u3059\u3002\u3082\u3057\u8a00\u8a9e\u304c\u300cstatic\u300d\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u308b\u306a\u3089\u3070\u3001\u305d\u306e\u8a00\u8a9e\u306f\u7d14\u7c8b\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u8a00\u8a9e\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u4f8b\u3048\u3070\u3001Java\u306f\u300cstatic\u300d\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u7d14\u7c8b\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u8a00\u8a9e\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u3057\u304b\u3057\u3001Scala\u306f\u7d14\u7c8b\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u8a00\u8a9e\u3067\u3059\u3002<\/p>\n<h3>\u300cScala\u306e\u300cobject\u300d\u30ad\u30fc\u30ef\u30fc\u30c9\u306e\u4f7f\u3044\u65b9\u306f\u4f55\u3067\u3059\u304b\uff1f\u307e\u305f\u3001Scala\u3067\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3059\u308b\u65b9\u6cd5\u306f\u3042\u308a\u307e\u3059\u304b\uff1f\u300d<\/h3>\n<p>Scala\u3067\u306f\u3001object\u30ad\u30fc\u30ef\u30fc\u30c9\u306f\u4ee5\u4e0b\u306e\u76ee\u7684\u3067\u4f7f\u7528\u3055\u308c\u307e\u3059\uff1a<\/p>\n<ul class=\"post-ul\">\n<li>It is used to create singleton object in Scala.<\/li>\n<\/ul>\n<pre class=\"post-pre\"><code>object MySingletonObject\r\n<\/code><\/pre>\n<p>\u3053\u3053\u3067\u306f\u3001MySingletonObject\u306f\u81ea\u52d5\u7684\u306b\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u306a\u308a\u307e\u3059\u3002\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u30ad\u30fc\u30ef\u30fc\u30c9\u306f\u3001\u5b9f\u884c\u53ef\u80fd\u306aScala\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u3042\u308bScala\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u5b9a\u7fa9\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>object MyScalaExecutableProgram{   \r\n   def main(args: Array[String]){\r\n       println(\"Hello World\")\r\n   }\r\n}\r\n<\/code><\/pre>\n<p>\u4e0a\u8a18\u306e\u3088\u3046\u306b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u5185\u3067main\u30e1\u30bd\u30c3\u30c9\u3092\u5b9a\u7fa9\u3059\u308b\u3068\uff08\u3053\u308c\u306fJava\u306emain()\u30e1\u30bd\u30c3\u30c9\u3068\u540c\u3058\u3067\u3059\uff09\u3001\u81ea\u52d5\u7684\u306b\u5b9f\u884c\u53ef\u80fd\u306aScala\u30d7\u30ed\u30b0\u30e9\u30e0\u3068\u3057\u3066\u6271\u308f\u308c\u307e\u3059\u3002\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u3001&#8217;static&#8217;\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u305b\u305a\u306b\u9759\u7684\u30e1\u30f3\u30d0\u30fc\uff08\u9759\u7684\u5909\u6570\u3084\u9759\u7684\u30e1\u30bd\u30c3\u30c9\u306a\u3069\uff09\u3092\u5b9a\u7fa9\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>object MyScalaStaticMembers{ \r\n  val PI: Double = 3.1414  \r\n  def add(a: Int, b: Int) = a + b\r\n}\r\n<\/code><\/pre>\n<p>PI\u3068\u5909\u6570\u3092\u8ffd\u52a0\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u9759\u7684\u306a\u30e1\u30f3\u30d0\u30fc\u3068\u3057\u3066\u306a\u308a\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u5225\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u305b\u305a\u306b\u3001MyScalaStaticMembers.add(10,20)\u306e\u3088\u3046\u306b\u547c\u3073\u51fa\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u30d5\u30a1\u30af\u30c8\u30ea\u30fc\u30e1\u30bd\u30c3\u30c9\u3092\u5b9a\u7fa9\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u306b\u95a2\u3059\u308b\u6b21\u306e\u8cea\u554f\u3092\u53c2\u7167\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h3>Scala\u3067object\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u3066Factory\u30e1\u30bd\u30c3\u30c9\u3092\u5b9a\u7fa9\u3059\u308b\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\uff1f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u306eFactory\u30e1\u30bd\u30c3\u30c9\u306e\u5b9a\u7fa9\u306e\u5229\u70b9\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n<p>Scala\u3067\u306f\u3001\u30d5\u30a1\u30af\u30c8\u30ea\u30fc\u30e1\u30bd\u30c3\u30c9\u3092\u5b9a\u7fa9\u3059\u308b\u305f\u3081\u306b\u300cobject\u300d\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002Scala\u306b\u304a\u3051\u308b\u3053\u308c\u3089\u306e\u30d5\u30a1\u30af\u30c8\u30ea\u30fc\u30e1\u30bd\u30c3\u30c9\u306e\u4e3b\u306a\u76ee\u7684\u306f\u3001\u300cnew\u300d\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u305b\u305a\u306b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u3067\u3059\u3002\u30d5\u30a1\u30af\u30c8\u30ea\u30fc\u30e1\u30bd\u30c3\u30c9\u3092\u5b9a\u7fa9\u3059\u308b\u305f\u3081\u306b\u306f\u3001\u6b21\u306b\u793a\u3059\u3088\u3046\u306bapply\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u30d7\u30e9\u30a4\u30de\u30ea\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3068\u8907\u6570\u306e\u88dc\u52a9\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u304c\u3042\u308b\u5834\u5408\u3001\u6b21\u306e\u3088\u3046\u306b\u8907\u6570\u306eapply\u30e1\u30bd\u30c3\u30c9\u3092\u5b9a\u7fa9\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>class Person(val firstName: String, val middleName: String, val lastName: String){\r\n  def this(firstName: String, lastName: String){\r\n    this(firstName,\"\",lastName)\r\n  }\r\n}\r\nobject Person{\r\n  def apply(val firstName: String, val middleName: String, val lastName: String) \r\n        = new Person(firstName,middleName,lastName)\r\n\r\n  def apply(val firstName: String, val lastName: String) \r\n        = new Person(firstName, lastName)\r\n}\r\n<\/code><\/pre>\n<p>\u4eca\u3067\u306f\u3001new\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u305b\u305a\u306b\u307e\u305f\u306f\u304a\u597d\u304d\u306a\u65b9\u6cd5\u3067Person\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>val p1 = new Person(\"Scala\",\"Java\")\r\nor \r\nval p1 = Person(\"Scala\",\"Java\")\r\n<\/code><\/pre>\n<h3>Scala\u306b\u304a\u3051\u308bapply\u30e1\u30bd\u30c3\u30c9\u306f\u4f55\u3067\u3059\u304b\uff1fScala\u306b\u304a\u3051\u308bunapply\u30e1\u30bd\u30c3\u30c9\u306f\u4f55\u3067\u3059\u304b\uff1fapply\u30e1\u30bd\u30c3\u30c9\u3068unapply\u30e1\u30bd\u30c3\u30c9\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n<p>Scala\u3067\u306f\u3001apply\u30e1\u30bd\u30c3\u30c9\u3068unapply\u30e1\u30bd\u30c3\u30c9\u306f\u975e\u5e38\u306b\u91cd\u8981\u306a\u5f79\u5272\u3092\u679c\u305f\u3057\u307e\u3059\u3002\u307e\u305f\u3001Play Framework\u3067\u306f\u3001Form\u30c7\u30fc\u30bf\u3068Model\u30c7\u30fc\u30bf\u306e\u9593\u3067\u30c7\u30fc\u30bf\u3092\u30de\u30c3\u30d4\u30f3\u30b0\u304a\u3088\u3073\u30a2\u30f3\u30de\u30c3\u30d4\u30f3\u30b0\u3059\u308b\u969b\u306b\u975e\u5e38\u306b\u4fbf\u5229\u3067\u3059\u3002\u7c21\u5358\u306b\u8a00\u3048\u3070\u3001<\/p>\n<ul class=\"post-ul\">\n<li>apply method: To compose or assemble an object from it\u2019s components.<\/li>\n<li>unapply method: To decompose or dis-assemble an object into it\u2019s components.<\/li>\n<\/ul>\n<p>Scala\u306eapply\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u305d\u306e\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u4f7f\u7528\u3057\u3066\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u69cb\u6210\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001Person\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3057\u305f\u3044\u5834\u5408\u3001firstName\u3068lastName\u306e2\u3064\u306e\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u4f7f\u7528\u3057\u3066Person\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u69cb\u6210\u3057\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u793a\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>class Person(val firstName: String, val lastName: String)\r\n\r\nobject Person{\r\n  def apply(firstName: String, lastName: String) \r\n        = new Person(firstName, lastName)\r\n}\r\n<\/code><\/pre>\n<p>Scala\u306eunapply\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u305d\u306e\u69cb\u6210\u8981\u7d20\u306b\u5206\u89e3\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u306fapply\u30e1\u30bd\u30c3\u30c9\u306e\u9006\u30d7\u30ed\u30bb\u30b9\u306b\u5f93\u3044\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001Person\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u3042\u308b\u5834\u5408\u3001\u4ee5\u4e0b\u306b\u793a\u3059\u3088\u3046\u306b\u3001\u3053\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092firstName\u3068lastName\u306e2\u3064\u306e\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306b\u5206\u89e3\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>class Person(val firstName: String, val lastName: String)\r\n\r\nobject Person{\r\n  def apply(firstName: String, lastName: String) \r\n        = new Person(firstName, lastName)\r\n\r\n    def unapply(p: Person): (String,String) \r\n        = (p.firstName, p.lastName)\r\n}\r\n<\/code><\/pre>\n<h3>Scala\u3067\u306e&#8217;new&#8217;\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u305b\u305a\u306b\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u4f5c\u6210\u3059\u308b\u5834\u5408\u3001\u305d\u306e\u5185\u90e8\u3067\u3069\u306e\u3088\u3046\u306b\u6a5f\u80fd\u3057\u307e\u3059\u304b\uff1f \u3044\u3064\u3053\u306e\u30a2\u30d7\u30ed\u30fc\u30c1\u3092\u9078\u3076\u306e\u3067\u3059\u304b\uff1f Scala\u3067\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u5ba3\u8a00\u3059\u308b\u65b9\u6cd5\u306f\u3042\u308a\u307e\u3059\u304b\uff1f<\/h3>\n<p>Scala\u3067\u306f\u3001&#8217;new&#8217;\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u305b\u305a\u306b\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u4f5c\u6210\u3059\u308b\u5834\u5408\u3001\u5185\u90e8\u7684\u306b\u306fCompanion\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u5229\u7528\u53ef\u80fd\u306a\u9069\u5207\u306aapply\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3057\u307e\u3059\u3002\u3053\u3053\u3067\u9069\u5207\u306aapply\u30e1\u30bd\u30c3\u30c9\u3068\u306f\u3001\u5f15\u6570\u3068\u4e00\u81f4\u3059\u308b\u65b9\u6cd5\u306e\u3053\u3068\u3092\u6307\u3057\u307e\u3059\u3002\u3053\u306e\u30aa\u30d7\u30b7\u30e7\u30f3\u3092\u9078\u629e\u3059\u308b\u30bf\u30a4\u30df\u30f3\u30b0\u306f\u3001\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u306a\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u63d0\u4f9b\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u3001&#8217;new&#8217;\u30ad\u30fc\u30ef\u30fc\u30c9\u306e\u4f7f\u7528\u3092\u56de\u907f\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u3067\u3059\u3002\u305d\u306e\u5834\u5408\u306f\u3001\u540c\u3058\u30d1\u30e9\u30e1\u30fc\u30bf\u30bb\u30c3\u30c8\u3092\u6301\u3064apply\u30e1\u30bd\u30c3\u30c9\u306e\u307f\u3092\u5b9f\u88c5\u3057\u3001\u30af\u30e9\u30b9\u306e\u30e6\u30fc\u30b6\u30fc\u304c\u65b0\u305f\u306a\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u305b\u305a\u306b\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u4f5c\u6210\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u307e\u3059\u3002<\/p>\n<h3>Scala\u3067\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u306a\u30d7\u30e9\u30a4\u30de\u30ea\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u5ba3\u8a00\u3059\u308b\u65b9\u6cd5\u306f\u3042\u308a\u307e\u3059\u304b\uff1fScala\u3067\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u306a\u30d7\u30e9\u30a4\u30de\u30ea\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u547c\u3073\u51fa\u3059\u65b9\u6cd5\u306f\u3042\u308a\u307e\u3059\u304b\uff1f<\/h3>\n<p>Scala\u3067\u306f\u3001\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u306a\u30d7\u30e9\u30a4\u30de\u30ea\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u7c21\u5358\u306b\u5ba3\u8a00\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u793a\u3059\u3088\u3046\u306b\u3001\u30af\u30e9\u30b9\u540d\u306e\u5f8c\u308d\u3001\u30d1\u30e9\u30e1\u30fc\u30bf\u30ea\u30b9\u30c8\u306e\u524d\u306b\u300cprivate\u300d\u3092\u8ffd\u52a0\u3057\u3066\u3001\u30d7\u30e9\u30a4\u30de\u30ea\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u5b9a\u7fa9\u3059\u308b\u3060\u3051\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>class Person private (name: String)\r\nobject Person{\r\n def apply(name: String) = new Person(name)\r\n}\r\n<\/code><\/pre>\n<p>\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u306a\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u30fc\u3067\u3042\u308b\u305f\u3081\u3001\u5916\u90e8\u304b\u3089\u306f\u547c\u3073\u51fa\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u305b\u3093\u3002\u4e0a\u8a18\u306b\u793a\u3055\u308c\u305f\u3088\u3046\u306b\u3001\u30d5\u30a1\u30af\u30c8\u30ea\u30fc\u30e1\u30bd\u30c3\u30c9\uff08apply\u30e1\u30bd\u30c3\u30c9\uff09\u3092\u63d0\u4f9b\u3057\u3001\u305d\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u30fc\u3092\u9593\u63a5\u7684\u306b\u4f7f\u7528\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h3>\u30b9\u30ab\u30e9\u306e\u30b3\u30f3\u30d1\u30cb\u30aa\u30f3\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u3001\u81ea\u8eab\u306e\u30b3\u30f3\u30d1\u30cb\u30aa\u30f3\u30af\u30e9\u30b9\u306e\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u30e1\u30f3\u30d0\u30fc\u306b\u30a2\u30af\u30bb\u30b9\u3057\u307e\u3059\u304b\uff1f<\/h3>\n<p>\u4e00\u822c\u7684\u306b\u3001\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u30e1\u30f3\u30d0\u30fc\u306f\u305d\u306e\u30af\u30e9\u30b9\u5185\u3067\u306e\u307f\u30a2\u30af\u30bb\u30b9\u53ef\u80fd\u3067\u3059\u3002\u3057\u304b\u3057\u3001Scala\u306e\u30b3\u30f3\u30d1\u30cb\u30aa\u30f3\u30af\u30e9\u30b9\u3068\u30b3\u30f3\u30d1\u30cb\u30aa\u30f3\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u306f\u3001\u5225\u306e\u6a5f\u80fd\u304c\u63d0\u4f9b\u3055\u308c\u3066\u3044\u307e\u3059\u3002Scala\u3067\u306f\u3001\u30b3\u30f3\u30d1\u30cb\u30aa\u30f3\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u81ea\u8eab\u306e\u30b3\u30f3\u30d1\u30cb\u30aa\u30f3\u30af\u30e9\u30b9\u306e\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u30e1\u30f3\u30d0\u30fc\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u307e\u3059\u3057\u3001\u307e\u305f\u30b3\u30f3\u30d1\u30cb\u30aa\u30f3\u30af\u30e9\u30b9\u3082\u81ea\u8eab\u306e\u30b3\u30f3\u30d1\u30cb\u30aa\u30f3\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u30e1\u30f3\u30d0\u30fc\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3>\u30b9\u30ab\u30e9\u306b\u304a\u3051\u308b\u300c\u30af\u30e9\u30b9\u300d\u3068\u300c\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u300d\u3068\u3044\u30462\u3064\u306e\u7570\u306a\u308b\u30ad\u30fc\u30ef\u30fc\u30c9\u306b\u95a2\u3059\u308b\u4e3b\u306a\u30c7\u30b6\u30a4\u30f3\u306e\u6c7a\u5b9a\u4e8b\u9805\u306f\u4f55\u3067\u3059\u304b\uff1f\u307e\u305f\u3001\u30b9\u30ab\u30e9\u3067\u306f\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30e1\u30f3\u30d0\u30fc\u3068\u9759\u7684\u30e1\u30f3\u30d0\u30fc\u3092\u3069\u306e\u3088\u3046\u306b\u5b9a\u7fa9\u3057\u307e\u3059\u304b\uff1f<\/h3>\n<p>Scala\u3067\u306f\u3001\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30e1\u30f3\u30d0\u30fc\u3092\u5b9a\u7fa9\u3059\u308b\u305f\u3081\u306bclass\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u3001\u9759\u7684\u30e1\u30f3\u30d0\u30fc\u3092\u5b9a\u7fa9\u3059\u308b\u305f\u3081\u306bobject\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002Scala\u306b\u306fstatic\u30ad\u30fc\u30ef\u30fc\u30c9\u306f\u3042\u308a\u307e\u305b\u3093\u304c\u3001object\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u3066\u305d\u308c\u3089\u3092\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u306b\u95a2\u3059\u308b\u4e3b\u306a\u8a2d\u8a08\u4e0a\u306e\u6c7a\u5b9a\u306f\u3001\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30e1\u30f3\u30d0\u30fc\u3068\u9759\u7684\u30e1\u30f3\u30d0\u30fc\u306e\u660e\u78ba\u306a\u5206\u96e2\u3067\u3059\u3002\u305d\u308c\u3089\u306f\u7de9\u304f\u7d50\u5408\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3082\u30461\u3064\u306e\u4e3b\u306a\u7406\u7531\u306f\u3001Scala\u304c\u7d14\u7c8b\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u8a00\u8a9e\u306b\u306a\u308b\u305f\u3081\u306bstatic\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u907f\u3051\u308b\u305f\u3081\u3067\u3059\u3002<\/p>\n<h3>Scala\u306b\u304a\u3051\u308b\u300c\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u300d\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u3053\u3068\u3067\u3059\u304b\u3001\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u3053\u3068\u3067\u3059\u304b\uff1f<\/h3>\n<p>Java\u3068\u306f\u7570\u306a\u308a\u3001Scala\u306b\u306f\u300c\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u300d\u3068\u3044\u3046\u8a00\u8449\u306b\u306f2\u3064\u306e\u610f\u5473\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u306b\u3064\u3044\u3066\u6df7\u4e71\u3057\u306a\u3044\u3067\u304f\u3060\u3055\u3044\u3001\u79c1\u304c\u660e\u78ba\u306b\u8aac\u660e\u3057\u307e\u3059\u3002Java\u3067\u306f\u3001\u300c\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u300d\u3068\u3044\u3046\u610f\u5473\u3057\u304b\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<ul class=\"post-ul\">\n<li>Like Java, the first meaning of object is \u201cAn instance of a class\u201d.<\/li>\n<\/ul>\n<pre class=\"post-pre\"><code>val p1 = new Person(\"Scala\",\"Java\")\r\nor \r\nval p1 = Person(\"Scala\",\"Java\")\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\n<li>Second meaning is that object is a keyword in Scala. It is used to define Scala Executable programs, Companion Objects, Singleton Objects etc.<\/li>\n<\/ul>\n<h3>\u30b9\u30ab\u30e9\u306b\u304a\u3051\u308bCompanion Object\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f\u30b9\u30ab\u30e9\u306b\u304a\u3051\u308bCompanion Class\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f\u30b9\u30ab\u30e9\u306b\u304a\u3051\u308bCompanion Object\u306e\u5229\u7528\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n<p>\u30b7\u30f3\u30d7\u30eb\u306b\u8a00\u3048\u3070\u3001Scala\u306e\u30af\u30e9\u30b9\u3068\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u540c\u3058\u540d\u524d\u3067\u540c\u3058\u30bd\u30fc\u30b9\u30d5\u30a1\u30a4\u30eb\u5185\u306b\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b\u5834\u5408\u3001\u305d\u306e\u30af\u30e9\u30b9\u306f\u300c\u30b3\u30f3\u30d1\u30cb\u30aa\u30f3\u30af\u30e9\u30b9\u300d\u3068\u547c\u3070\u308c\u3001\u305d\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u300c\u30b3\u30f3\u30d1\u30cb\u30aa\u30f3\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u300d\u3068\u547c\u3070\u308c\u307e\u3059\u3002Scala\u306e\u300cclass\u300d\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u3066\u30af\u30e9\u30b9\u3092\u4f5c\u6210\u3057\u3001\u540c\u3058\u540d\u524d\u306e\u300cobject\u300d\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u3066\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3059\u308b\u3068\u3001\u305d\u306e\u30af\u30e9\u30b9\u304c\u300c\u30b3\u30f3\u30d1\u30cb\u30aa\u30f3\u30af\u30e9\u30b9\u300d\u3068\u3057\u3066\u8a8d\u8b58\u3055\u308c\u3001\u305d\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u300c\u30b3\u30f3\u30d1\u30cb\u30aa\u30f3\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u300d\u3068\u3057\u3066\u8a8d\u8b58\u3055\u308c\u307e\u3059\u3002\u4f8b\uff1aEmployee.scala<\/p>\n<pre class=\"post-pre\"><code>class Employee{ }\r\nobject Employee{ }\r\n<\/code><\/pre>\n<p>\u30b9\u30ab\u30e9\u3067\u306f\u3001\u30b3\u30f3\u30d1\u30cb\u30aa\u30f3\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u4e3b\u306a\u76ee\u7684\u306f\u3001\u9069\u7528\u30e1\u30bd\u30c3\u30c9\u3092\u5b9a\u7fa9\u3057\u3001\u305d\u306e\u30b3\u30f3\u30d1\u30cb\u30aa\u30f3\u30af\u30e9\u30b9\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u4f5c\u6210\u3059\u308b\u969b\u306bnew\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u306a\u3044\u3088\u3046\u306b\u3059\u308b\u3053\u3068\u3067\u3059\u3002<\/p>\n<h3>Scala\u3067\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9f\u88c5\u3059\u308b\u65b9\u6cd5\u306f\u3069\u306e\u3088\u3046\u306a\u3082\u306e\u3067\u3059\u304b\uff1f<\/h3>\n<p>Java\u306e\u30d0\u30c3\u30af\u30b0\u30e9\u30a6\u30f3\u30c9\u304b\u3089\u308f\u304b\u308b\u3088\u3046\u306b\u3001\u79c1\u305f\u3061\u306f\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5229\u7528\u3057\u3066\u30b3\u30f3\u30bf\u30af\u30c8\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002\u3057\u304b\u3057\u3001Scala\u306b\u306f\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u6982\u5ff5\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u3055\u3089\u306b\u3001Scala\u306b\u306f\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u30ad\u30fc\u30ef\u30fc\u30c9\u3082\u3042\u308a\u307e\u305b\u3093\u3002Scala\u306b\u306f\u3001\u3088\u308a\u5f37\u529b\u304b\u3064\u67d4\u8edf\u306a\u6982\u5ff5\u3067\u3042\u308b\u30c8\u30ec\u30a4\u30c8\u304c\u3053\u306e\u76ee\u7684\u3067\u5229\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n<h3>\u30b9\u30ab\u30e9\u306b\u304a\u3051\u308b\u300c\u30ec\u30f3\u30b8\uff08Range\uff09\u300d\u3068\u306f\u3069\u306e\u3088\u3046\u306a\u3082\u306e\u3067\u3059\u304b\uff1f\u30b9\u30ab\u30e9\u3067\u30ec\u30f3\u30b8\u3092\u4f5c\u6210\u3059\u308b\u65b9\u6cd5\u306f\u3042\u308a\u307e\u3059\u304b\uff1f<\/h3>\n<p>\u7bc4\u56f2\u306f\u30b9\u30ab\u30e9\uff08Scala\uff09\u306b\u304a\u3051\u308b\u9045\u5ef6\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3067\u3059\u3002\u7bc4\u56f2\u306f\u3001scala.Range\u306e\u3088\u3046\u306a\u300cscala\u300d\u30d1\u30c3\u30b1\u30fc\u30b8\u306b\u3042\u308b\u30af\u30e9\u30b9\u3067\u3059\u3002\u6574\u6570\u306e\u5024\u306e\u30b7\u30fc\u30b1\u30f3\u30b9\u3092\u8868\u3059\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u6574\u6570\u306e\u9806\u5e8f\u4ed8\u304d\u30b7\u30fc\u30b1\u30f3\u30b9\u3067\u3059\u3002\u4f8b\uff1a<\/p>\n<pre class=\"post-pre\"><code>scala&gt; 1 to 10\r\nres0: scala.collection.immutable.Range.Inclusive = Range(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)\r\n\r\nscala&gt; 1 until 10\r\nres1: scala.collection.immutable.Range = Range(1, 2, 3, 4, 5, 6, 7, 8, 9)\r\n<\/code><\/pre>\n<h3>Scala\u3067\u306e\u578bNothing\u306e\u5024\u306f\u3044\u304f\u3064\u3042\u308a\u307e\u3059\u304b\uff1f<\/h3>\n<p>Scala\u3067\u306f\u3001Nothing\u578b\u306f\u30bc\u30ed\u306e\u5024\u3092\u6301\u3061\u307e\u305b\u3093\u3002\u4f55\u306e\u5024\u3082\u6301\u3061\u307e\u305b\u3093\u3002\u305d\u308c\u306f\u3059\u3079\u3066\u306eValue\u30af\u30e9\u30b9\u3068Reference\u30af\u30e9\u30b9\u306e\u30b5\u30d6\u30bf\u30a4\u30d7\u3067\u3059\u3002<\/p>\n<h3>\u30b9\u30ab\u30e9\u306e\u5024\u306e\u4e2d\u306b\u306f\u3001\u3069\u306e\u304f\u3089\u3044\u306e\u7a2e\u985e\u306e\u30e6\u30cb\u30c3\u30c8\u304c\u3042\u308a\u307e\u3059\u304b\uff1f<\/h3>\n<p>Scala\u306b\u304a\u3044\u3066\u3001Unit\u306fJava\u306evoid\u30ad\u30fc\u30ef\u30fc\u30c9\u306b\u4f3c\u305f\u3082\u306e\u3067\u3059\u3002\u3053\u308c\u306f\u300c\u5024\u304c\u5b58\u5728\u3057\u306a\u3044\u300d\u3053\u3068\u3092\u8868\u3059\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u305d\u306e\u5024\u306f()\u3068\u3044\u3046\u552f\u4e00\u306e\u5024\u3067\u3059\u3002<\/p>\n<h3>\u7d14\u7c8b\u95a2\u6570\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n<p>\u7d14\u7c8b\u95a2\u6570\u3068\u306f\u3001\u3069\u3093\u306a\u89b3\u5bdf\u53ef\u80fd\u306a\u526f\u4f5c\u7528\u3082\u6301\u305f\u306a\u3044\u95a2\u6570\u306e\u3053\u3068\u3092\u6307\u3057\u307e\u3059\u3002\u3064\u307e\u308a\u3001\u540c\u3058\u5165\u529b\u3092\u4f55\u56de\u547c\u3073\u51fa\u3057\u3066\u3082\u5e38\u306b\u540c\u3058\u7d50\u679c\u3092\u8fd4\u3057\u307e\u3059\u3002\u7d14\u7c8b\u95a2\u6570\u306f\u5e38\u306b\u540c\u3058\u5165\u529b\u306b\u5bfe\u3057\u3066\u540c\u3058\u51fa\u529b\u3092\u8fd4\u3057\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001<\/p>\n<pre class=\"post-pre\"><code>scala&gt; 10 + 20\r\nres0: Int = 30\r\nscala&gt;\r\nscala&gt; 10 + 20\r\nres0: Int = 30\r\n<\/code><\/pre>\n<p>\u3053\u3053\u3067\u306f\u3001Int\u30af\u30e9\u30b9\u3067\u4f7f\u7528\u3067\u304d\u308b\u300c+\u300d\u3068\u3044\u3046\u7d14\u7c8b\u306a\u95a2\u6570\u304c\u3042\u308a\u307e\u3059\u3002\u540c\u3058\u5165\u529b\u3067\u3042\u308b10\u306830\u306b\u5bfe\u3057\u3066\u3001\u4f55\u56de\u547c\u3073\u51fa\u3057\u3066\u3082\u540c\u3058\u7d50\u679c\u3067\u3042\u308b30\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n<h3>FP\u306b\u304a\u3044\u3066\u3001\u95a2\u6570\u3068\u624b\u7d9a\u304d\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f (FP\u306b\u304a\u3044\u3066\u3001\u304b\u3093\u3059\u3046\u3068\u3057\u3085\u3058\u304d\u306e\u3061\u304c\u3044\u306f\u306a\u3093\u3067\u3059\u304b\uff1f)<\/h3>\n<p>\u4e21\u8005\u306f\u8a08\u7b97\u3092\u5b9f\u884c\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u304c\u3001\u95a2\u6570\u578b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u4e16\u754c\u306b\u304a\u3044\u3066\u306f1\u3064\u306e\u5927\u304d\u306a\u9055\u3044\u304c\u3042\u308a\u307e\u3059\u3002\u95a2\u6570\u306f\u526f\u4f5c\u7528\u306e\u306a\u3044\u8a08\u7b97\u5358\u4f4d\u3067\u3059\u304c\u3001\u624b\u7d9a\u304d\u306f\u526f\u4f5c\u7528\u3092\u6301\u3064\u8a08\u7b97\u5358\u4f4d\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<h3>Scala\u306e\u88dc\u52a9\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3068Java\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u4e3b\u306a\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n<p>Scala\u306e\u88dc\u52a9\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306f\u3001Java\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3068\u307b\u307c\u540c\u3058\u3067\u3059\u304c\u3001\u82e5\u5e72\u306e\u9055\u3044\u304c\u3042\u308a\u307e\u3059\u3002Java\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3068\u6bd4\u8f03\u3059\u308b\u3068\u3001\u88dc\u52a9\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u308f\u305a\u304b\u306a\u9055\u3044\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<ul class=\"post-ul\">\n<li>The auxiliary constructors are called using \u201cthis\u201d keyword.<\/li>\n<li>All auxiliary constructor are defined with the same name that is \u201cthis\u201d. In Java, we use class name to define constructors.<\/li>\n<li>Each auxiliary constructor must start with a call to a previously defined auxiliary constructor or the primary constructor.<\/li>\n<li>We use \u2018def\u2019 keyword to define auxiliary constructors like method\/function definition. In Java, constructor definition and Method definition is different.<\/li>\n<\/ul>\n<h3>Scala\u306efor-comprehension\u69cb\u6587\u306b\u304a\u3051\u308b &#8216;yield&#8217; \u30ad\u30fc\u30ef\u30fc\u30c9\u306e\u7528\u9014\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n<p>Scala\u306efor\u30b3\u30f3\u30d7\u30ea\u30d8\u30f3\u30b7\u30e7\u30f3\u69cb\u6587\u3067\u306f\u3001\u300cyield\u300d\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002 \u300cfor\/yield\u300d\u306f\u3001\u8981\u7d20\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3092\u53cd\u5fa9\u51e6\u7406\u3057\u3001\u540c\u3058\u30bf\u30a4\u30d7\u306e\u65b0\u3057\u3044\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3092\u751f\u6210\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002 \u3053\u308c\u306b\u3088\u3063\u3066\u30aa\u30ea\u30b8\u30ca\u30eb\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306f\u5909\u66f4\u3055\u308c\u307e\u305b\u3093\u3002 \u30aa\u30ea\u30b8\u30ca\u30eb\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3068\u540c\u3058\u30bf\u30a4\u30d7\u306e\u65b0\u3057\u3044\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u304c\u751f\u6210\u3055\u308c\u307e\u3059\u3002 \u305f\u3068\u3048\u3070\u3001List\u3092\u53cd\u5fa9\u51e6\u7406\u3059\u308b\u305f\u3081\u306b\u300cfor\/yield\u300d\u69cb\u6587\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u65b0\u3057\u3044List\u304c\u751f\u6210\u3055\u308c\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>scala&gt; val list = List(1,2,3,4,5)\r\nlist: List[Int] = List(1, 2, 3, 4, 5)\r\n\r\nscala&gt; for(l &lt;- list) yield l*2\r\nres0: List[Int] = List(2, 4, 6, 8, 10)\r\n<\/code><\/pre>\n<h3>Scala\u306efor-comprehension\u69cb\u6587\u306b\u304a\u3051\u308bguard\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n<p>Scala\u306e\u5834\u5408\u3001for\u30b3\u30f3\u30d7\u30ea\u30d8\u30f3\u30b7\u30e7\u30f3\u69cb\u6587\u306b\u306f\u3001\u8981\u7d20\u3092\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u3057\u65b0\u3057\u3044\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3092\u751f\u6210\u3059\u308b\u305f\u3081\u306e\u6761\u4ef6\u3092\u8a18\u8ff0\u3059\u308bif\u7bc0\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306eif\u7bc0\u306f\u300c\u30ac\u30fc\u30c9\u300d\u3068\u3082\u547c\u3070\u308c\u307e\u3059\u3002\u30ac\u30fc\u30c9\u304c\u771f\u306e\u5834\u5408\u3001\u305d\u306e\u8981\u7d20\u3092\u65b0\u3057\u3044\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306b\u8ffd\u52a0\u3057\u307e\u3059\u3002\u305d\u3046\u3067\u306a\u3051\u308c\u3070\u3001\u5143\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306b\u306f\u8ffd\u52a0\u3057\u307e\u305b\u3093\u3002\u4f8b\uff1a- for\u30b3\u30f3\u30d7\u30ea\u30d8\u30f3\u30b7\u30e7\u30f3\u306e\u30ac\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\u65b0\u3057\u3044\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306b\u5076\u6570\u306e\u307f\u3092\u751f\u6210\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>scala&gt; val list = List(1,2,3,4,5,6,7,8,9,10)\r\nlist: List[Int] = List(1, 2, 3, 4, 5 , 6 , 7 , 8 , 9 , 10)\r\n\r\nscala&gt; for(l &lt;- list if l % 2 =0 ) yield l\r\nres0: List[Int] = List(2, 4, 6, 8, 10)\r\n<\/code><\/pre>\n<h3>Scala\u306f\u3001Java 8\u3088\u308a\u3082\u7d99\u627f\u30c0\u30a4\u30e4\u30e2\u30f3\u30c9\u554f\u984c\u3092\u81ea\u52d5\u7684\u304b\u3064\u7c21\u5358\u306b\u89e3\u6c7a\u3059\u308b\u65b9\u6cd5\u3092\u63d0\u4f9b\u3057\u3066\u3044\u307e\u3059\u3002<\/h3>\n<p>Java 8\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u7d99\u627f\u306e\u30c0\u30a4\u30e4\u30e2\u30f3\u30c9\u554f\u984c\u304c\u767a\u751f\u3057\u307e\u3059\u3002Java 8\u3067\u306f\u3001\u958b\u767a\u8005\u304c\u624b\u52d5\u3067\u89e3\u6c7a\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u554f\u984c\u306b\u5bfe\u3057\u3066\u30c7\u30d5\u30a9\u30eb\u30c8\u3084\u81ea\u52d5\u306e\u89e3\u6c7a\u7b56\u306f\u63d0\u4f9b\u3055\u308c\u307e\u305b\u3093\u3002Scala\u3067\u3082Traits\u3092\u4f7f\u7528\u3059\u308b\u3068\u540c\u3058\u554f\u984c\u304c\u767a\u751f\u3057\u307e\u3059\u304c\u3001Scala\u306f\u975e\u5e38\u306b\u8ce2\u304f\u3001Class Linearization\u306e\u6982\u5ff5\u3092\u4f7f\u7528\u3057\u3066\u81ea\u52d5\u7684\u306b\u7d99\u627f\u306e\u30c0\u30a4\u30e4\u30e2\u30f3\u30c9\u554f\u984c\u3092\u89e3\u6c7a\u3057\u307e\u3059\u3002<\/p>\n<h3>Scala\u3067\u306f\u3001\u30d1\u30bf\u30fc\u30f3\u30de\u30c3\u30c1\u30f3\u30b0\u306f\u3069\u306e\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306b\u5f93\u3044\u307e\u3059\u304b\uff1fJava\u3067\u306f\u3001&#8217;isinstanceof&#8217;\u6f14\u7b97\u5b50\u306f\u3069\u306e\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306b\u5f93\u3044\u307e\u3059\u304b\uff1f<\/h3>\n<p>Scala\u3067\u306f\u3001\u30d1\u30bf\u30fc\u30f3\u30de\u30c3\u30c1\u30f3\u30b0\u306fVisitor\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306b\u5f93\u3044\u307e\u3059\u3002\u540c\u69d8\u306b\u3001Java\u306e\u300cisinstanceof\u300d\u6f14\u7b97\u5b50\u3082Visitor\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306b\u5f93\u3044\u307e\u3059\u3002\u3053\u308c\u304c\u300cScala Intermediate Interview Questions and Answers\u300d\u306b\u3064\u3044\u3066\u306e\u3059\u3079\u3066\u3067\u3059\u3002\u6765\u308b\u6295\u7a3f\u3067\u306f\u3001\u3044\u304f\u3064\u304b\u306eAdvanced Scala Interview Questions and Answers\u306b\u3064\u3044\u3066\u8b70\u8ad6\u3057\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\u6b8b\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u3053\u306e\u6295\u7a3f\u3092\u8aad\u3080\u524d\u306b\u3001\u300cScala\u57fa\u672c\u7684\u306a\u30a4\u30f3\u30bf\u30d3\u30e5\u30fc\u306e\u8cea\u554f\u3068\u56de\u7b54\u300d\u3068\u3044\u3046\u79c1\u306e\u524d\u306e\u6295\u7a3f\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002Scala\u8a00\u8a9e\u306e\u57fa\u790e\u77e5\u8b58\u3092\u5f97\u308b\u305f\u3081\u3067\u3059\u3002\u3053\u306e\u6295\u7a3f\u3067\u306f\u3001\u7d4c\u9a13\u8c4a\u5bcc\u306aScala\u958b\u767a\u8005\u306b\u3068\u3063\u3066\u6709\u7528\u306a\u3001\u3055\u3089\u306a\u308bScala\u30a4\u30f3\u30bf [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-325","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Scala\u306e\u9762\u63a5\u8cea\u554f - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Scala\u306e\u9762\u63a5\u8cea\u554f\u3092\u5206\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3002\u5b9f\u8df5\u7684\u306a\u4f8b\u3068\u30b3\u30fc\u30c9\u3001\u6ce8\u610f\u70b9\u3092\u542b\u3081\u3066\u521d\u5fc3\u8005\u306b\u3082\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u8aac\u660e\u3057\u307e\u3059\u3002\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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