{"id":921,"date":"2022-10-06T01:35:02","date_gmt":"2023-08-22T13:52:35","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%e6%8a%bd%e8%b1%a1%e7%9a%84%e3%81%aa%e3%83%95%e3%82%a1%e3%82%af%e3%83%88%e3%83%aa%e3%83%bc%e3%83%87%e3%82%b6%e3%82%a4%e3%83%b3%e3%83%91%e3%82%bf%e3%83%bc\/"},"modified":"2025-08-01T03:33:24","modified_gmt":"2025-07-31T18:33:24","slug":"java%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8b%e6%8a%bd%e8%b1%a1%e7%9a%84%e3%81%aa%e3%83%95%e3%82%a1%e3%82%af%e3%83%88%e3%83%aa%e3%83%bc%e3%83%87%e3%82%b6%e3%82%a4%e3%83%b3%e3%83%91%e3%82%bf%e3%83%bc","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8b%e6%8a%bd%e8%b1%a1%e7%9a%84%e3%81%aa%e3%83%95%e3%82%a1%e3%82%af%e3%83%88%e3%83%aa%e3%83%bc%e3%83%87%e3%82%b6%e3%82%a4%e3%83%b3%e3%83%91%e3%82%bf%e3%83%bc\/","title":{"rendered":"Java\u306b\u304a\u3051\u308b\u62bd\u8c61\u7684\u306a\u30d5\u30a1\u30af\u30c8\u30ea\u30fc\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u3002"},"content":{"rendered":"<p>Java\u306e\u4f8b\u3067Abstract Factory\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u3078\u3088\u3046\u3053\u305d\u3002Abstract Factory\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306f\u3001Creational\u30d1\u30bf\u30fc\u30f3\u306e1\u3064\u3067\u3059\u3002Abstract Factory\u30d1\u30bf\u30fc\u30f3\u306f\u3001Factory\u30d1\u30bf\u30fc\u30f3\u3068\u307b\u307c\u540c\u3058\u3067\u3059\u304c\u3001\u30d5\u30a1\u30af\u30c8\u30ea\u306e\u30d5\u30a1\u30af\u30c8\u30ea\u306e\u3088\u3046\u306a\u3082\u306e\u3067\u3059\u3002<\/p>\n<h2>\u62bd\u8c61\u30d5\u30a1\u30af\u30c8\u30ea\u30fc<\/h2>\n<p>\u3082\u3057Java\u306e\u30d5\u30a1\u30af\u30c8\u30ea\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306b\u8a73\u3057\u3044\u306a\u3089\u30011\u3064\u306e\u30d5\u30a1\u30af\u30c8\u30ea\u30af\u30e9\u30b9\u3057\u304b\u306a\u3044\u3053\u3068\u306b\u6c17\u3065\u304f\u3067\u3057\u3087\u3046\u3002\u3053\u306e\u30d5\u30a1\u30af\u30c8\u30ea\u30af\u30e9\u30b9\u306f\u3001\u63d0\u4f9b\u3055\u308c\u305f\u5165\u529b\u306b\u57fa\u3065\u3044\u3066\u7570\u306a\u308b\u30b5\u30d6\u30af\u30e9\u30b9\u3092\u8fd4\u3057\u3001if-else\u6587\u307e\u305f\u306fswitch\u6587\u3092\u4f7f\u7528\u3057\u3066\u3053\u308c\u3092\u5b9f\u73fe\u3057\u307e\u3059\u3002\u62bd\u8c61\u30d5\u30a1\u30af\u30c8\u30ea\u30d1\u30bf\u30fc\u30f3\u3067\u306f\u3001if-else\u30d6\u30ed\u30c3\u30af\u3092\u6392\u9664\u3057\u3001\u5404\u30b5\u30d6\u30af\u30e9\u30b9\u306b\u5bfe\u3057\u3066\u500b\u5225\u306e\u30d5\u30a1\u30af\u30c8\u30ea\u30af\u30e9\u30b9\u3092\u6301\u3061\u307e\u3059\u3002\u305d\u3057\u3066\u3001\u5165\u529b\u3055\u308c\u305f\u30d5\u30a1\u30af\u30c8\u30ea\u30af\u30e9\u30b9\u306b\u57fa\u3065\u3044\u3066\u30b5\u30d6\u30af\u30e9\u30b9\u3092\u8fd4\u3059\u62bd\u8c61\u30d5\u30a1\u30af\u30c8\u30ea\u30af\u30e9\u30b9\u3082\u3042\u308a\u307e\u3059\u3002\u6700\u521d\u306f\u6df7\u4e71\u3059\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u304c\u3001\u5b9f\u88c5\u3092\u898b\u308b\u3068\u30d5\u30a1\u30af\u30c8\u30ea\u30d1\u30bf\u30fc\u30f3\u3068\u62bd\u8c61\u30d5\u30a1\u30af\u30c8\u30ea\u30d1\u30bf\u30fc\u30f3\u306e\u5fae\u5999\u306a\u9055\u3044\u304c\u975e\u5e38\u306b\u308f\u304b\u308a\u3084\u3059\u304f\u7406\u89e3\u3067\u304d\u307e\u3059\u3002\u30d5\u30a1\u30af\u30c8\u30ea\u30d1\u30bf\u30fc\u30f3\u306e\u6295\u7a3f\u3068\u540c\u69d8\u306b\u3001\u540c\u3058\u30b9\u30fc\u30d1\u30fc\u30af\u30e9\u30b9\u3068\u30b5\u30d6\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n<h3>\u62bd\u8c61\u7684\u306a\u30d5\u30a1\u30af\u30c8\u30ea\u30fc\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306e\u30b9\u30fc\u30d1\u30fc\u30af\u30e9\u30b9\u3068\u30b5\u30d6\u30af\u30e9\u30b9<\/h3>\n<p>\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf.java (Konpyu-ta.java)<\/p>\n<pre class=\"post-pre\"><code>package com.scdev.design.model;\r\n \r\npublic abstract class Computer {\r\n     \r\n    public abstract String getRAM();\r\n    public abstract String getHDD();\r\n    public abstract String getCPU();\r\n     \r\n    @Override\r\n    public String toString(){\r\n        return \"RAM= \"+this.getRAM()+\", HDD=\"+this.getHDD()+\", CPU=\"+this.getCPU();\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>PC.java\u3092\u65e5\u672c\u8a9e\u3067\u8a00\u3044\u63db\u3048\u308b\u3068\u3001\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>PC.java\u30d5\u30a1\u30a4\u30eb<\/p>\n<pre class=\"post-pre\"><code>package com.scdev.design.model;\r\n \r\npublic class PC extends Computer {\r\n \r\n    private String ram;\r\n    private String hdd;\r\n    private String cpu;\r\n     \r\n    public PC(String ram, String hdd, String cpu){\r\n        this.ram=ram;\r\n        this.hdd=hdd;\r\n        this.cpu=cpu;\r\n    }\r\n    @Override\r\n    public String getRAM() {\r\n        return this.ram;\r\n    }\r\n \r\n    @Override\r\n    public String getHDD() {\r\n        return this.hdd;\r\n    }\r\n \r\n    @Override\r\n    public String getCPU() {\r\n        return this.cpu;\r\n    }\r\n \r\n}\r\n<\/code><\/pre>\n<p>\u30b5\u30fc\u30d0\u30fc.java<\/p>\n<pre class=\"post-pre\"><code>package com.scdev.design.model;\r\n \r\n \r\npublic class Server extends Computer {\r\n \r\n    private String ram;\r\n    private String hdd;\r\n    private String cpu;\r\n     \r\n    public Server(String ram, String hdd, String cpu){\r\n        this.ram=ram;\r\n        this.hdd=hdd;\r\n        this.cpu=cpu;\r\n    }\r\n    @Override\r\n    public String getRAM() {\r\n        return this.ram;\r\n    }\r\n \r\n    @Override\r\n    public String getHDD() {\r\n        return this.hdd;\r\n    }\r\n \r\n    @Override\r\n    public String getCPU() {\r\n        return this.cpu;\r\n    }\r\n \r\n}\r\n<\/code><\/pre>\n<h3>\u5404\u30b5\u30d6\u30af\u30e9\u30b9\u306b\u5bfe\u3059\u308b\u30d5\u30a1\u30af\u30c8\u30ea\u30fc\u30af\u30e9\u30b9<\/h3>\n<p>\u307e\u305a\u6700\u521d\u306b\u3001Abstract Factory\uff08\u62bd\u8c61\u30d5\u30a1\u30af\u30c8\u30ea\u30fc\uff09\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u307e\u305f\u306f\u62bd\u8c61\u30af\u30e9\u30b9\u3092\u4f5c\u6210\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002ComputerAbstractFactory.java<\/p>\n<pre class=\"post-pre\"><code>package com.scdev.design.abstractfactory;\r\n\r\nimport com.scdev.design.model.Computer;\r\n\r\npublic interface ComputerAbstractFactory {\r\n\r\n\tpublic Computer createComputer();\r\n\r\n}\r\n<\/code><\/pre>\n<p>createComputer()\u30e1\u30bd\u30c3\u30c9\u304c\u30b9\u30fc\u30d1\u30fc\u30af\u30e9\u30b9\u306eComputer\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u8fd4\u3057\u3066\u3044\u308b\u3053\u3068\u306b\u6ce8\u76ee\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u3053\u308c\u304b\u3089\u30d5\u30a1\u30af\u30c8\u30ea\u30fc\u30af\u30e9\u30b9\u306f\u3053\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9f\u88c5\u3057\u3001\u305d\u308c\u305e\u308c\u306e\u30b5\u30d6\u30af\u30e9\u30b9\u3092\u8fd4\u3059\u3088\u3046\u306b\u3057\u307e\u3059\u3002PCFactory.java<\/p>\n<pre class=\"post-pre\"><code>package com.scdev.design.abstractfactory;\r\n\r\nimport com.scdev.design.model.Computer;\r\nimport com.scdev.design.model.PC;\r\n\r\npublic class PCFactory implements ComputerAbstractFactory {\r\n\r\n\tprivate String ram;\r\n\tprivate String hdd;\r\n\tprivate String cpu;\r\n\t\r\n\tpublic PCFactory(String ram, String hdd, String cpu){\r\n\t\tthis.ram=ram;\r\n\t\tthis.hdd=hdd;\r\n\t\tthis.cpu=cpu;\r\n\t}\r\n\t@Override\r\n\tpublic Computer createComputer() {\r\n\t\treturn new PC(ram,hdd,cpu);\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n<p>\u540c\u69d8\u306b\u3001Server\u306e\u30b5\u30d6\u30af\u30e9\u30b9\u306e\u305f\u3081\u306e\u30d5\u30a1\u30af\u30c8\u30ea\u30fc\u30af\u30e9\u30b9\u3082\u7528\u610f\u3059\u308b\u4e88\u5b9a\u3067\u3059\u3002ServerFactory.java\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.scdev.design.abstractfactory;\r\n\r\nimport com.scdev.design.model.Computer;\r\nimport com.scdev.design.model.Server;\r\n\r\npublic class ServerFactory implements ComputerAbstractFactory {\r\n\r\n\tprivate String ram;\r\n\tprivate String hdd;\r\n\tprivate String cpu;\r\n\t\r\n\tpublic ServerFactory(String ram, String hdd, String cpu){\r\n\t\tthis.ram=ram;\r\n\t\tthis.hdd=hdd;\r\n\t\tthis.cpu=cpu;\r\n\t}\r\n\t\r\n\t@Override\r\n\tpublic Computer createComputer() {\r\n\t\treturn new Server(ram,hdd,cpu);\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n<p>\u3053\u308c\u304b\u3089\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30af\u30e9\u30b9\u304c\u30b5\u30d6\u30af\u30e9\u30b9\u3092\u4f5c\u6210\u3059\u308b\u305f\u3081\u306e\u5165\u308a\u53e3\u3092\u63d0\u4f9b\u3059\u308b\u30b3\u30f3\u30b7\u30e5\u30fc\u30de\u30fc\u30af\u30e9\u30b9\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002ComputerFactory.java<\/p>\n<pre class=\"post-pre\"><code>package com.scdev.design.abstractfactory;\r\n\r\nimport com.scdev.design.model.Computer;\r\n\r\npublic class ComputerFactory {\r\n\r\n\tpublic static Computer getComputer(ComputerAbstractFactory factory){\r\n\t\treturn factory.createComputer();\r\n\t}\r\n}\r\n<\/code><\/pre>\n<p>\u300c\u3053\u306e\u30af\u30e9\u30b9\u306f\u30b7\u30f3\u30d7\u30eb\u3067\u3042\u308b\u3053\u3068\u306b\u6ce8\u610f\u3057\u3001getComputer\u30e1\u30bd\u30c3\u30c9\u306fComputerAbstractFactory\u306e\u5f15\u6570\u3092\u53d7\u3051\u53d6\u308a\u3001Computer\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u8fd4\u3057\u307e\u3059\u3002\u3053\u306e\u6642\u70b9\u3067\u3001\u5b9f\u88c5\u306f\u660e\u78ba\u306b\u306a\u3063\u3066\u3044\u308b\u306f\u305a\u3067\u3059\u3002\u7c21\u5358\u306a\u30c6\u30b9\u30c8\u30e1\u30bd\u30c3\u30c9\u3092\u66f8\u3044\u3066\u3001\u30b5\u30d6\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u53d6\u5f97\u3059\u308b\u305f\u3081\u306b\u62bd\u8c61\u30d5\u30a1\u30af\u30c8\u30ea\u3092\u4f7f\u7528\u3059\u308b\u65b9\u6cd5\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002TestDesignPatterns.java\u300d\u3068\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.scdev.design.test;\r\n\r\nimport com.scdev.design.abstractfactory.PCFactory;\r\nimport com.scdev.design.abstractfactory.ServerFactory;\r\nimport com.scdev.design.factory.ComputerFactory;\r\nimport com.scdev.design.model.Computer;\r\n\r\npublic class TestDesignPatterns {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\ttestAbstractFactory();\r\n\t}\r\n\r\n\tprivate static void testAbstractFactory() {\r\n\t\tComputer pc = com.scdev.design.abstractfactory.ComputerFactory.getComputer(new PCFactory(\"2 GB\",\"500 GB\",\"2.4 GHz\"));\r\n\t\tComputer server = com.scdev.design.abstractfactory.ComputerFactory.getComputer(new ServerFactory(\"16 GB\",\"1 TB\",\"2.9 GHz\"));\r\n\t\tSystem.out.println(\"AbstractFactory PC Config::\"+pc);\r\n\t\tSystem.out.println(\"AbstractFactory Server Config::\"+server);\r\n\t}\r\n}\r\n<\/code><\/pre>\n<p>\u4e0a\u8a18\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u51fa\u529b\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>AbstractFactory PC Config::RAM= 2 GB, HDD=500 GB, CPU=2.4 GHz\r\nAbstractFactory Server Config::RAM= 16 GB, HDD=1 TB, CPU=2.9 GHz\r\n<\/code><\/pre>\n<p>\u62bd\u8c61\u30d5\u30a1\u30af\u30c8\u30ea\u30fc\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306e\u5b9f\u88c5\u306b\u95a2\u3059\u308b\u30af\u30e9\u30b9\u56f3\u3067\u3059\u3002 (Kikinha crosstalks, this is the class diagram for implementing the abstract factory design pattern.)<\/p>\n<h3>\u62bd\u8c61\u30d5\u30a1\u30af\u30c8\u30ea\u30fc\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306e\u5229\u70b9<\/h3>\n<ul class=\"post-ul\">\n<li>Abstract Factory design pattern provides approach to code for interface rather than implementation.<\/li>\n<li>Abstract Factory pattern is \u201cfactory of factories\u201d and can be easily extended to accommodate more products, for example we can add another sub-class Laptop and a factory LaptopFactory.<\/li>\n<li>Abstract Factory pattern is robust and avoid conditional logic of Factory pattern.<\/li>\n<\/ul>\n<h3>JDK\u306b\u304a\u3051\u308b\u62bd\u8c61\u30d5\u30a1\u30af\u30c8\u30ea\u30fc\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306e\u4f8b<\/h3>\n<ul class=\"post-ul\">\n<li>javax.xml.parsers.DocumentBuilderFactory#newInstance()<\/li>\n<li>javax.xml.transform.TransformerFactory#newInstance()<\/li>\n<li>javax.xml.xpath.XPathFactory#newInstance()<\/li>\n<\/ul>\n<h3>\u62bd\u8c61\u30d5\u30a1\u30af\u30c8\u30ea\u30fc\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306e\u30d3\u30c7\u30aa\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb<\/h3>\n<p>\u6700\u8fd1\u3001\u79c1\u306fYouTube\u306b\u62bd\u8c61\u30d5\u30a1\u30af\u30c8\u30ea\u30fc\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306b\u95a2\u3059\u308b\u52d5\u753b\u3092\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3057\u307e\u3057\u305f\u3002\u3053\u306e\u52d5\u753b\u3067\u306f\u3001\u3044\u3064\u3069\u306e\u3088\u3046\u306b\u62bd\u8c61\u30d5\u30a1\u30af\u30c8\u30ea\u30fc\u30d1\u30bf\u30fc\u30f3\u3092\u5b9f\u88c5\u3059\u308b\u304b\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u3066\u3044\u307e\u3059\u3002\u307e\u305f\u3001\u30d5\u30a1\u30af\u30c8\u30ea\u30fc\u30d1\u30bf\u30fc\u30f3\u3068\u62bd\u8c61\u30d5\u30a1\u30af\u30c8\u30ea\u30fc\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306e\u9055\u3044\u306b\u3064\u3044\u3066\u3082\u8aac\u660e\u3057\u307e\u3057\u305f\u3002https:\/\/youtu.be\/BPkYkyVWOaw<\/p>\n<p>\u79c1\u306eGitHub\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u304b\u3089\u3001\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u306e\u4f8b\u3067Abstract Factory\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u3078\u3088\u3046\u3053\u305d\u3002Abstract Factory\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306f\u3001Creational\u30d1\u30bf\u30fc\u30f3\u306e1\u3064\u3067\u3059\u3002Abstract Factory\u30d1\u30bf\u30fc\u30f3\u306f\u3001Facto [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-921","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>Java\u306b\u304a\u3051\u308b\u62bd\u8c61\u7684\u306a\u30d5\u30a1\u30af\u30c8\u30ea\u30fc\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u3002 - Blog - Silicon Cloud<\/title>\n<meta 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