\u30b9\u30c6\u30fc\u30c8\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306f\u3001\u884c\u52d5\u306e\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306e\u4e00\u3064\u3067\u3059\u3002\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u5185\u90e8\u306e\u72b6\u614b\u306b\u57fa\u3065\u3044\u3066\u632f\u308b\u821e\u3044\u3092\u5909\u3048\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n
\u3082\u3057\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u632f\u308b\u821e\u3044\u3092\u305d\u306e\u72b6\u614b\u306b\u57fa\u3065\u3044\u3066\u5909\u3048\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u5834\u5408\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u5185\u306b\u72b6\u614b\u5909\u6570\u3092\u6301\u3064\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u305d\u3057\u3066\u3001\u72b6\u614b\u306b\u57fa\u3065\u3044\u3066\u7570\u306a\u308b\u30a2\u30af\u30b7\u30e7\u30f3\u3092\u5b9f\u884c\u3059\u308b\u305f\u3081\u306b\u3001if-else\u306e\u6761\u4ef6\u6587\u3092\u4f7f\u3044\u307e\u3059\u3002\u72b6\u614b\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306f\u3001Context\u3068State\u306e\u5b9f\u88c5\u3092\u901a\u3058\u3066\u3001\u3053\u308c\u3092\u4f53\u7cfb\u7684\u304b\u3064\u7de9\u304f\u7d50\u5408\u3055\u308c\u305f\u65b9\u6cd5\u3067\u5b9f\u73fe\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002State Pattern Context\u306f\u3001State\u306e\u5177\u8c61\u5b9f\u88c5\u306e\u3046\u3061\u306e1\u3064\u3078\u306eState\u53c2\u7167\u3092\u6301\u3064\u30af\u30e9\u30b9\u3067\u3059\u3002Context\u306f\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u72b6\u614b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u8ee2\u9001\u3057\u3066\u51e6\u7406\u3057\u307e\u3059\u3002\u7c21\u5358\u306a\u4f8b\u3092\u4f7f\u3063\u3066\u7406\u89e3\u3057\u307e\u3057\u3087\u3046\u3002\u30c6\u30ec\u30d3\u306e\u30ea\u30e2\u30b3\u30f3\u3092\u5358\u4e00\u306e\u30dc\u30bf\u30f3\u3067\u30a2\u30af\u30b7\u30e7\u30f3\u3092\u5b9f\u884c\u3059\u308b\u3088\u3046\u306b\u5b9f\u88c5\u3057\u305f\u3044\u3068\u3057\u307e\u3059\u3002\u3082\u3057\u72b6\u614b\u304cON\u3067\u3042\u308c\u3070\u3001\u30c6\u30ec\u30d3\u3092\u30aa\u30f3\u306b\u3057\u3001\u72b6\u614b\u304cOFF\u3067\u3042\u308c\u3070\u3001\u30c6\u30ec\u30d3\u3092\u30aa\u30d5\u306b\u3057\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u3088\u3046\u306bif-else\u306e\u6761\u4ef6\u6587\u3092\u4f7f\u3063\u3066\u5b9f\u88c5\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002TVRemoteBasic.java<\/p>\n
package com.scdev.design.state;\r\n\r\npublic class TVRemoteBasic {\r\n\r\n\tprivate String state=\"\";\r\n\t\r\n\tpublic void setState(String state){\r\n\t\tthis.state=state;\r\n\t}\r\n\t\r\n\tpublic void doAction(){\r\n\t\tif(state.equalsIgnoreCase(\"ON\")){\r\n\t\t\tSystem.out.println(\"TV is turned ON\");\r\n\t\t}else if(state.equalsIgnoreCase(\"OFF\")){\r\n\t\t\tSystem.out.println(\"TV is turned OFF\");\r\n\t\t}\r\n\t}\r\n\r\n\tpublic static void main(String args[]){\r\n\t\tTVRemoteBasic remote = new TVRemoteBasic();\r\n\t\t\r\n\t\tremote.setState(\"ON\");\r\n\t\tremote.doAction();\r\n\t\t\r\n\t\tremote.setState(\"OFF\");\r\n\t\tremote.doAction();\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3001\u30ea\u30e2\u30fc\u30c8\u306e\u72b6\u614b\u3092\u8a2d\u5b9a\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3059\u308b\u7279\u5b9a\u306e\u5024\u3092\u77e5\u308b\u5fc5\u8981\u304c\u3042\u308b\u3053\u3068\u306b\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u3055\u3089\u306b\u3001\u72b6\u614b\u306e\u6570\u304c\u5897\u3048\u308b\u3068\u3001\u5b9f\u88c5\u3068\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306e\u30b3\u30fc\u30c9\u306e\u5f37\u3044\u7d50\u5408\u306f\u975e\u5e38\u306b\u7dad\u6301\u304a\u3088\u3073\u62e1\u5f35\u304c\u96e3\u3057\u304f\u306a\u308b\u3067\u3057\u3087\u3046\u3002\u3053\u306e\u4e0a\u8a18\u306eTV\u30ea\u30e2\u30b3\u30f3\u306e\u4f8b\u3092\u5b9f\u88c5\u3059\u308b\u305f\u3081\u306b\u3001State\u30d1\u30bf\u30fc\u30f3\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n
\u30b9\u30c6\u30fc\u30c8\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9<\/h3>\n
\u307e\u305a\u7b2c\u4e00\u306b\u3001\u7570\u306a\u308b\u5177\u8c61\u72b6\u614b\u304a\u3088\u3073\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u30af\u30e9\u30b9\u306b\u3088\u3063\u3066\u5b9f\u88c5\u3055\u308c\u308b\u3079\u304d\u65b9\u6cd5\u3092\u5b9a\u7fa9\u3059\u308bState\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002State.java<\/p>\n
package com.scdev.design.state;\r\n\r\npublic interface State {\r\n\r\n\tpublic void doAction();\r\n}\r\n<\/code><\/pre>\n\u72b6\u614b\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306e\u5177\u4f53\u7684\u306a\u72b6\u614b\u306e\u5b9f\u88c5<\/h3>\n
\u79c1\u305f\u3061\u306e\u4f8b\u3067\u306f\u3001TV\u3092\u30aa\u30f3\u306b\u3059\u308b\u305f\u3081\u306e\u72b6\u614b\u3068\u3001\u30aa\u30d5\u306b\u3059\u308b\u305f\u3081\u306e\u5225\u306e\u72b6\u614b\u306e2\u3064\u304c\u3042\u308a\u307e\u3059\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u3053\u308c\u3089\u306e\u632f\u308b\u821e\u3044\u306b\u5bfe\u3059\u308b2\u3064\u306e\u5177\u4f53\u7684\u306a\u72b6\u614b\u5b9f\u88c5\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002 TVStartState.java<\/p>\n
package com.scdev.design.state;\r\n\r\npublic class TVStartState implements State {\r\n\r\n\t@Override\r\n\tpublic void doAction() {\r\n\t\tSystem.out.println(\"TV is turned ON\");\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n\u30c6\u30ec\u30d3\u306e\u505c\u6b62\u72b6\u614b\u3092\u793a\u3059TVStopState.java<\/p>\n
package com.scdev.design.state;\r\n\r\npublic class TVStopState implements State {\r\n\r\n\t@Override\r\n\tpublic void doAction() {\r\n\t\tSystem.out.println(\"TV is turned OFF\");\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n\u4eca\u3001\u5185\u90e8\u72b6\u614b\u306b\u57fa\u3065\u3044\u3066\u632f\u308b\u821e\u3044\u3092\u5909\u3048\u308bContext\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u5b9f\u88c5\u3059\u308b\u6e96\u5099\u304c\u3067\u304d\u307e\u3057\u305f\u3002<\/p>\n
\u30b9\u30c6\u30fc\u30c8\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306e\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u5b9f\u88c5<\/h3>\n
TVContext.java\u306e\u65e5\u672c\u8a9e\u3067\u306e\u540c\u7fa9\u8a9e\u306f\u6b21\u306e\u901a\u308a\u3067\u3059:
\n\u30c6\u30ec\u30d3\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8.java<\/p>\n
package com.scdev.design.state;\r\n\r\npublic class TVContext implements State {\r\n\r\n\tprivate State tvState;\r\n\r\n\tpublic void setState(State state) {\r\n\t\tthis.tvState=state;\r\n\t}\r\n\r\n\tpublic State getState() {\r\n\t\treturn this.tvState;\r\n\t}\r\n\r\n\t@Override\r\n\tpublic void doAction() {\r\n\t\tthis.tvState.doAction();\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n\u73fe\u5728\u306e\u72b6\u614b\u3092\u4fdd\u6301\u3057\u3001\u305d\u306e\u72b6\u614b\u306b\u5fdc\u3058\u3066\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u72b6\u614b\u306e\u5b9f\u88c5\u306b\u8ee2\u9001\u3059\u308b\u305f\u3081\u306b\u3001Context\u306fState\u3082\u5b9f\u88c5\u3057\u3066\u3044\u308b\u3053\u3068\u306b\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
\u72b6\u614b\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306e\u30c6\u30b9\u30c8\u30d7\u30ed\u30b0\u30e9\u30e0<\/h3>\n
\u3067\u306f\u3001\u30c6\u30ec\u30d3\u30ea\u30e2\u30b3\u30f3\u306e\u72b6\u614b\u30d1\u30bf\u30fc\u30f3\u306e\u5b9f\u88c5\u3092\u30c6\u30b9\u30c8\u3059\u308b\u305f\u3081\u306b\u3001\u7c21\u5358\u306a\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u66f8\u3044\u3066\u307f\u307e\u3057\u3087\u3046\u3002TVRemote.java<\/p>\n
package com.scdev.design.state;\r\n\r\npublic class TVRemote {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tTVContext context = new TVContext();\r\n\t\tState tvStartState = new TVStartState();\r\n\t\tState tvStopState = new TVStopState();\r\n\t\t\r\n\t\tcontext.setState(tvStartState);\r\n\t\tcontext.doAction();\r\n\t\t\r\n\t\t\r\n\t\tcontext.setState(tvStopState);\r\n\t\tcontext.doAction();\r\n\t\t\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n\u4e0a\u8a18\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u51fa\u529b\u306f\u3001\u72b6\u614b\u30d1\u30bf\u30fc\u30f3\u3092\u4f7f\u7528\u305b\u305a\u306b\u57fa\u672c\u7684\u306a\u30c6\u30ec\u30d3\u30ea\u30e2\u30b3\u30f3\u306e\u5b9f\u88c5\u3068\u540c\u3058\u3067\u3059\u3002<\/p>\n
\u72b6\u614b\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306e\u5229\u70b9<\/h3>\n
State\u30d1\u30bf\u30fc\u30f3\u3092\u4f7f\u7528\u3057\u3066\u591a\u69d8\u306a\u632f\u308b\u821e\u3044\u3092\u5b9f\u88c5\u3059\u308b\u3053\u3068\u306e\u5229\u70b9\u306f\u660e\u3089\u304b\u3067\u3059\u3002\u30a8\u30e9\u30fc\u306e\u53ef\u80fd\u6027\u304c\u5c11\u306a\u304f\u3001\u3055\u3089\u306a\u308b\u632f\u308b\u821e\u3044\u306e\u305f\u3081\u306e\u8ffd\u52a0\u306e\u72b6\u614b\u3092\u975e\u5e38\u306b\u7c21\u5358\u306b\u8ffd\u52a0\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30b3\u30fc\u30c9\u304c\u3088\u308a\u5f37\u56fa\u3067\u3001\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u304c\u5bb9\u6613\u3067\u67d4\u8edf\u6027\u304c\u5411\u4e0a\u3057\u307e\u3059\u3002\u307e\u305f\u3001State\u30d1\u30bf\u30fc\u30f3\u306f\u3001\u3053\u306e\u30b7\u30ca\u30ea\u30aa\u3067\u306eif-else\u3084switch-case\u306e\u6761\u4ef6\u30ed\u30b8\u30c3\u30af\u3092\u907f\u3051\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3057\u305f\u3002State\u30d1\u30bf\u30fc\u30f3\u306f\u3001Strategy\u30d1\u30bf\u30fc\u30f3\u306b\u975e\u5e38\u306b\u4f3c\u3066\u3044\u307e\u3059\u306e\u3067\u3001Java\u306b\u304a\u3051\u308bStrategy\u30d1\u30bf\u30fc\u30f3\u3082\u78ba\u8a8d\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002\u3053\u308c\u3067State\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306b\u3064\u3044\u3066\u306e\u5185\u5bb9\u306f\u4ee5\u4e0a\u3067\u3059\u3002\u304a\u6c17\u306b\u53ec\u3055\u308c\u305f\u304b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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