{"id":767,"date":"2023-07-24T13:51:22","date_gmt":"2022-12-15T19:13:08","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/java%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8b%e3%83%95%e3%82%a1%e3%82%b5%e3%83%bc%e3%83%89%e3%83%87%e3%82%b6%e3%82%a4%e3%83%b3%e3%83%91%e3%82%bf%e3%83%bc%e3%83%b3\/"},"modified":"2025-08-01T02:17:32","modified_gmt":"2025-07-31T17:17:32","slug":"java%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8b%e3%83%95%e3%82%a1%e3%82%b5%e3%83%bc%e3%83%89%e3%83%87%e3%82%b6%e3%82%a4%e3%83%b3%e3%83%91%e3%82%bf%e3%83%bc%e3%83%b3","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8b%e3%83%95%e3%82%a1%e3%82%b5%e3%83%bc%e3%83%89%e3%83%87%e3%82%b6%e3%82%a4%e3%83%b3%e3%83%91%e3%82%bf%e3%83%bc%e3%83%b3\/","title":{"rendered":"Java\u306b\u304a\u3051\u308b\u30d5\u30a1\u30b5\u30fc\u30c9\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3"},"content":{"rendered":"

\u30d5\u30a1\u30b5\u30fc\u30c9\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306f\u3001\u30a2\u30c0\u30d7\u30bf\u30fc\u30d1\u30bf\u30fc\u30f3\u3084\u30c7\u30b3\u30ec\u30fc\u30bf\u30fc\u30d1\u30bf\u30fc\u30f3\u306a\u3069\u306e\u69cb\u9020\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306e\u4e00\u3064\u3067\u3059\u3002\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u304c\u30b7\u30b9\u30c6\u30e0\u3068\u7c21\u5358\u306b\u3084\u308a\u53d6\u308a\u3067\u304d\u308b\u3088\u3046\u306b\u3059\u308b\u305f\u3081\u306b\u3001\u30d5\u30a1\u30b5\u30fc\u30c9\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u304c\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n

\u30d5\u30a1\u30b5\u30fc\u30c9\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3<\/h2>\n

GoF\u306eFacade\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306b\u3088\u308b\u3068\u3001\u3068\u306f\u8a00\u3044\u307e\u3059\u3002<\/p>\n

\u30b5\u30d6\u30b7\u30b9\u30c6\u30e0\u306e\u4e00\u9023\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306b\u7d71\u4e00\u3055\u308c\u305f\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002\u30d5\u30a1\u30b5\u30fc\u30c9\u30d1\u30bf\u30fc\u30f3\u306f\u3001\u3088\u308a\u9ad8\u30ec\u30d9\u30eb\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u3067\u3001\u30b5\u30d6\u30b7\u30b9\u30c6\u30e0\u306e\u4f7f\u7528\u3092\u5bb9\u6613\u306b\u3057\u307e\u3059\u3002<\/p><\/blockquote>\n

\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u8ff0\u3079\u3089\u308c\u3066\u3044\u307e\u3059:
\n\u300c\u4f8b\u3048\u3070\u3001\u79c1\u9054\u306fMySQL\/Oracle\u306e\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3092\u4f7f\u7528\u3057\u3001HTML\u30ec\u30dd\u30fc\u30c8\u3001PDF\u30ec\u30dd\u30fc\u30c8\u306a\u3069\u306e\u7570\u306a\u308b\u7a2e\u985e\u306e\u30ec\u30dd\u30fc\u30c8\u3092\u751f\u6210\u3059\u308b\u305f\u3081\u306e\u4e00\u9023\u306e\u30a4\u30f3\u30bf\u30d5\u30a7\u30fc\u30b9\u3092\u5099\u3048\u305f\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u6301\u3063\u3066\u3044\u308b\u3068\u3057\u307e\u3059\u3002\u3055\u307e\u3056\u307e\u306a\u7a2e\u985e\u306e\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3067\u4f5c\u696d\u3059\u308b\u305f\u3081\u306b\u3001\u7570\u306a\u308b\u30bb\u30c3\u30c8\u306e\u30a4\u30f3\u30bf\u30d5\u30a7\u30fc\u30b9\u304c\u5fc5\u8981\u3068\u306a\u308a\u307e\u3059\u3002\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306f\u3053\u308c\u3089\u306e\u30a4\u30f3\u30bf\u30d5\u30a7\u30fc\u30b9\u3092\u4f7f\u7528\u3057\u3066\u5fc5\u8981\u306a\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u63a5\u7d9a\u3092\u53d6\u5f97\u3057\u3001\u30ec\u30dd\u30fc\u30c8\u3092\u751f\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u8907\u96d1\u3055\u304c\u5897\u3057\u305f\u308a\u3001\u30a4\u30f3\u30bf\u30d5\u30a7\u30fc\u30b9\u306e\u632f\u308b\u821e\u3044\u306e\u540d\u524d\u304c\u6df7\u4e71\u3057\u3066\u3044\u305f\u308a\u3059\u308b\u3068\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306f\u7ba1\u7406\u3059\u308b\u306e\u304c\u96e3\u3057\u304f\u306a\u308a\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u3053\u3053\u3067\u30d5\u30a1\u30b5\u30fc\u30c9\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u3092\u9069\u7528\u3057\u3001\u65e2\u5b58\u306e\u30a4\u30f3\u30bf\u30d5\u30a7\u30fc\u30b9\u306e\u4e0a\u306b\u30e9\u30c3\u30d1\u30fc\u30a4\u30f3\u30bf\u30d5\u30a7\u30fc\u30b9\u3092\u63d0\u4f9b\u3057\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u30b5\u30dd\u30fc\u30c8\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u300d<\/p>\n

\u30d5\u30a1\u30b5\u30fc\u30c9\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3 – \u30a4\u30f3\u30bf\u30d5\u30a7\u30fc\u30b9\u306e\u30bb\u30c3\u30c8<\/h3>\n

\u65e5\u672c\u8a9e\u3067\u306f\u6b21\u306e\u3088\u3046\u306b\u8a00\u3044\u63db\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u300c\u79c1\u305f\u3061\u306fMySqlHelper\u3068OracleHelper\u3068\u3044\u30462\u3064\u306e\u30d8\u30eb\u30d1\u30fc\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u6301\u3064\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u300d<\/p>\n

package com.scdev.design.facade;\r\n\r\nimport java.sql.Connection;\r\n\r\npublic class MySqlHelper {\r\n\t\r\n\tpublic static Connection getMySqlDBConnection(){\r\n\t\t\/\/get MySql DB connection using connection parameters\r\n\t\treturn null;\r\n\t}\r\n\t\r\n\tpublic void generateMySqlPDFReport(String tableName, Connection con){\r\n\t\t\/\/get data from table and generate pdf report\r\n\t}\r\n\t\r\n\tpublic void generateMySqlHTMLReport(String tableName, Connection con){\r\n\t\t\/\/get data from table and generate pdf report\r\n\t}\r\n}\r\n<\/code><\/pre>\n
package com.scdev.design.facade;\r\n\r\nimport java.sql.Connection;\r\n\r\npublic class OracleHelper {\r\n\r\n\tpublic static Connection getOracleDBConnection(){\r\n\t\t\/\/get Oracle DB connection using connection parameters\r\n\t\treturn null;\r\n\t}\r\n\t\r\n\tpublic void generateOraclePDFReport(String tableName, Connection con){\r\n\t\t\/\/get data from table and generate pdf report\r\n\t}\r\n\t\r\n\tpublic void generateOracleHTMLReport(String tableName, Connection con){\r\n\t\t\/\/get data from table and generate pdf report\r\n\t}\r\n\t\r\n}\r\n<\/code><\/pre>\n
\u30d5\u30a1\u30b5\u30fc\u30c9\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9<\/h3>\n
\u4ee5\u4e0b\u306e\u3088\u3046\u306aFacade\u30d1\u30bf\u30fc\u30f3\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u578b\u306e\u5b89\u5168\u6027\u306e\u305f\u3081\u306bJava\u306eEnum\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u306b\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
package com.scdev.design.facade;\r\n\r\nimport java.sql.Connection;\r\n\r\npublic class HelperFacade {\r\n\r\n\tpublic static void generateReport(DBTypes dbType, ReportTypes reportType, String tableName){\r\n\t\tConnection con = null;\r\n\t\tswitch (dbType){\r\n\t\tcase MYSQL: \r\n\t\t\tcon = MySqlHelper.getMySqlDBConnection();\r\n\t\t\tMySqlHelper mySqlHelper = new MySqlHelper();\r\n\t\t\tswitch(reportType){\r\n\t\t\tcase HTML:\r\n\t\t\t\tmySqlHelper.generateMySqlHTMLReport(tableName, con);\r\n\t\t\t\tbreak;\r\n\t\t\tcase PDF:\r\n\t\t\t\tmySqlHelper.generateMySqlPDFReport(tableName, con);\r\n\t\t\t\tbreak;\r\n\t\t\t}\r\n\t\t\tbreak;\r\n\t\tcase ORACLE: \r\n\t\t\tcon = OracleHelper.getOracleDBConnection();\r\n\t\t\tOracleHelper oracleHelper = new OracleHelper();\r\n\t\t\tswitch(reportType){\r\n\t\t\tcase HTML:\r\n\t\t\t\toracleHelper.generateOracleHTMLReport(tableName, con);\r\n\t\t\t\tbreak;\r\n\t\t\tcase PDF:\r\n\t\t\t\toracleHelper.generateOraclePDFReport(tableName, con);\r\n\t\t\t\tbreak;\r\n\t\t\t}\r\n\t\t\tbreak;\r\n\t\t}\r\n\t\t\r\n\t}\r\n\t\r\n\tpublic static enum DBTypes{\r\n\t\tMYSQL,ORACLE;\r\n\t}\r\n\t\r\n\tpublic static enum ReportTypes{\r\n\t\tHTML,PDF;\r\n\t}\r\n}\r\n<\/code><\/pre>\n
\u30d5\u30a1\u30b5\u30fc\u30c9\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306e\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30d7\u30ed\u30b0\u30e9\u30e0<\/h3>\n
\u4eca\u3001Facade\u30d1\u30bf\u30fc\u30f3\u3092\u4f7f\u7528\u305b\u305a\u306b\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30fc\u30c9\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u307e\u305f\u3001Facade\u30d1\u30bf\u30fc\u30f3\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u4f7f\u7528\u3057\u305f\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30fc\u30c9\u3082\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
package com.scdev.design.test;\r\n\r\nimport java.sql.Connection;\r\n\r\nimport com.scdev.design.facade.HelperFacade;\r\nimport com.scdev.design.facade.MySqlHelper;\r\nimport com.scdev.design.facade.OracleHelper;\r\n\r\npublic class FacadePatternTest {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tString tableName=\"Employee\";\r\n\t\t\r\n\t\t\/\/generating MySql HTML report and Oracle PDF report without using Facade\r\n\t\tConnection con = MySqlHelper.getMySqlDBConnection();\r\n\t\tMySqlHelper mySqlHelper = new MySqlHelper();\r\n\t\tmySqlHelper.generateMySqlHTMLReport(tableName, con);\r\n\t\t\r\n\t\tConnection con1 = OracleHelper.getOracleDBConnection();\r\n\t\tOracleHelper oracleHelper = new OracleHelper();\r\n\t\toracleHelper.generateOraclePDFReport(tableName, con1);\r\n\t\t\r\n\t\t\/\/generating MySql HTML report and Oracle PDF report using Facade\r\n\t\tHelperFacade.generateReport(HelperFacade.DBTypes.MYSQL, HelperFacade.ReportTypes.HTML, tableName);\r\n\t\tHelperFacade.generateReport(HelperFacade.DBTypes.ORACLE, HelperFacade.ReportTypes.PDF, tableName);\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n
Facade\u30d1\u30bf\u30fc\u30f3\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u5074\u3067\u591a\u304f\u306e\u30ed\u30b8\u30c3\u30af\u3092\u56de\u907f\u3059\u308b\u65b9\u6cd5\u304c\u975e\u5e38\u306b\u7c21\u5358\u3067\u6574\u7406\u3055\u308c\u305f\u3082\u306e\u306b\u306a\u308b\u3053\u3068\u304c\u5206\u304b\u308b\u3067\u3057\u3087\u3046\u3002\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u63a5\u7d9a\u3092\u53d6\u5f97\u3059\u308b\u305f\u3081\u306eJDBC Driver Manager\u30af\u30e9\u30b9\u306f\u3001Facade\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306e\u7d20\u6674\u3089\u3057\u3044\u4f8b\u3067\u3059\u3002<\/p>\n
\u30d5\u30a1\u30b5\u30fc\u30c9\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306e\u91cd\u8981\u306a\u30dd\u30a4\u30f3\u30c8<\/h3>\n
    \n
  • Facade design pattern is more like a helper for client applications, it doesn\u2019t hide subsystem interfaces from the client. Whether to use Facade or not is completely dependent on client code.<\/li>\n
  • Facade design pattern can be applied at any point of development, usually when the number of interfaces grow and system gets complex.<\/li>\n
  • Subsystem interfaces are not aware of Facade and they shouldn\u2019t have any reference of the Facade interface.<\/li>\n
  • Facade design pattern should be applied for similar kind of interfaces, its purpose is to provide a single interface rather than multiple interfaces that does the similar kind of jobs.<\/li>\n
  • We can use Factory pattern with Facade to provide better interface to client systems.<\/li>\n<\/ul>\n
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