![\"\"](\"https:\/\/jan-napiorkowski.profesjonalnyprogramista.pl\/wp-content\/uploads\/2023\/09\/fabryka.jpg\")
<\/figure>\n\n\n\nW praktyce za\u0142\u00f3\u017cmy, \u017ce mamy aplikacj\u0119 „symuluj\u0105c\u0105” dwie restauracje: jedna serwuj\u0105ca burgera XXL i nap\u00f3j L, a druga burgera L i nap\u00f3j XXL w r\u00f3\u017cnych cenach. Bez zastosowania tego wzorca mog\u0142aby ona wygl\u0105da\u0107 tak:<\/p>\n\n\n
\npublic class Main {\n public static void main(String[] args) {\n\n Dish burger1 = new Burger(20, "XXL");\n Dish soda1 = new Soda(5, "L");\n\n Dish burger2 = new Burger(15, "L");\n Dish soda2 = new Soda(10, "XXL");\n }\n}\n<\/pre><\/div>\n\n\npublic abstract class Dish {\n private int price;\n private String size;\n\n public Dish(int price, String size) {\n this.price = price;\n this.size = size;\n }\n}\n\n<\/pre><\/div>\n\n\npublic class Burger extends Dish{\n public Burger(int price, String size) {\n super(price, size);\n }\n}\n\n<\/pre><\/div>\n\n\npublic class Soda extends Dish{\n public Soda(int price, String size) {\n super(price, size);\n }\n}\n\n<\/pre><\/div>\n\n\nW takim przypadku trzeba zawsze pami\u0119ta\u0107, kt\u00f3ra restauracja jakie serwuje obiekty. Po zastosowaniu wzorca fabryka program m\u00f3g\u0142by prezentowa\u0107 si\u0119 w taki spos\u00f3b:<\/p>\n\n\n
\nimport dishes.*;\n\npublic class Main {\n public static void main(String[] args) {\n\n Restaurant leftRestaurant = new LeftRestaurant();\n Restaurant rightRestaurant = new RightRestaurant();\n\n Dish leftBurger = leftRestaurant.createBurger();\n Dish leftSoda = leftRestaurant.createSoda();\n\n Dish rightBurger = rightRestaurant.createBurger();\n Dish rightSoda = rightRestaurant.createSoda();\n }\n}\n<\/pre><\/div>\n\n\npackage dishes;\n\npublic abstract class Dish {\n private int price;\n private String size;\n\n public Dish(int price, String size) {\n this.price = price;\n this.size = size;\n }\n}\n\n<\/pre><\/div>\n\n\npackage dishes;\n\npublic class Burger extends Dish{\n public Burger(int price, String size) {\n super(price, size);\n }\n}\n\n<\/pre><\/div>\n\n\npackage dishes;\n\npublic class Soda extends Dish{\n public Soda(int price, String size) {\n super(price, size);\n }\n}\n\n<\/pre><\/div>\n\n\npackage dishes;\n\npublic abstract class Restaurant {\n public abstract Dish createBurger();\n public abstract Dish createSoda();\n}\n\n<\/pre><\/div>\n\n\npackage dishes;\n\npublic class LeftRestaurant extends Restaurant{\n @Override\n public Dish createBurger() {\n return new Burger(20, "XXL");\n }\n\n @Override\n public Dish createSoda() {\n return new Soda(5, "L");\n }\n}\n\n<\/pre><\/div>\n\n\npackage dishes;\n\npublic class RightRestaurant extends Restaurant{\n @Override\n public Dish createBurger() {\n return new Burger(15, "L");\n }\n\n @Override\n public Dish createSoda() {\n return new Soda(10, "XXL");\n }\n}\n\n<\/pre><\/div>\n\n\nW tym konkretnym przypadku wzorzec fabryka dorobi\u0142 troch\u0119 kodu, ale jednocze\u015bnie go upro\u015bci\u0142. W bardziej rozbudowanych aplikacjach zmiana ta jest diametralna. <\/p>\n\n\n\n
Niestety najwi\u0119ksz\u0105 wad\u0105 tego wzorca jest to, \u017ce za ka\u017cdym razem jak chcemy doda\u0107 now\u0105 fabryk\u0119 lub produkty to musimy ingerowa\u0107 w wi\u0119kszo\u015b\u0107 poprzednich klas.<\/p>\n","protected":false},"excerpt":{"rendered":"
Fabryka jest wzorcem kreacyjnym, kt\u00f3rego celem jest u\u0142atwienie tworzenia obiekt\u00f3w tego samego typu bez specyfikowania ich klas. Przyk\u0142adowo jest przydatne w grach strategicznych, gdzie jeden budynek (fabryka) produkuje kilka typ\u00f3w jednostek z r\u00f3\u017cnymi zmiennymi. Og\u00f3lna struktura tego wzorca wygl\u0105da nast\u0119puj\u0105co: W praktyce za\u0142\u00f3\u017cmy, \u017ce mamy aplikacj\u0119 „symuluj\u0105c\u0105” dwie restauracje: jedna serwuj\u0105ca burgera XXL i nap\u00f3j […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-74","post","type-post","status-publish","format-standard","hentry","category-blog"],"_links":{"self":[{"href":"https:\/\/jan-napiorkowski.profesjonalnyprogramista.pl\/index.php?rest_route=\/wp\/v2\/posts\/74","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jan-napiorkowski.profesjonalnyprogramista.pl\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jan-napiorkowski.profesjonalnyprogramista.pl\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jan-napiorkowski.profesjonalnyprogramista.pl\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jan-napiorkowski.profesjonalnyprogramista.pl\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=74"}],"version-history":[{"count":2,"href":"https:\/\/jan-napiorkowski.profesjonalnyprogramista.pl\/index.php?rest_route=\/wp\/v2\/posts\/74\/revisions"}],"predecessor-version":[{"id":93,"href":"https:\/\/jan-napiorkowski.profesjonalnyprogramista.pl\/index.php?rest_route=\/wp\/v2\/posts\/74\/revisions\/93"}],"wp:attachment":[{"href":"https:\/\/jan-napiorkowski.profesjonalnyprogramista.pl\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=74"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jan-napiorkowski.profesjonalnyprogramista.pl\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=74"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jan-napiorkowski.profesjonalnyprogramista.pl\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=74"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}