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Observe the code below:<\/strong><\/p>\n\n\n\n <\/p>\n\n\n\n We wanted to create objects such as shape1, shape2, and shape 3. We did not directly (create and) call the class for the required objects. We did not create or call a circle class, or a square class, or a rectangle class. We rather thought there was a factory class that could create objects based on our requirements. We asked the factory to create a circle object, then it gave us a circle object. In the same way, we asked for square and rectangle objects from the factory class, and the class returned us square and rectangular objects. This is about: Factory Design Pattern: Examples are in Java<\/strong><\/p>\n\n\n\n <\/p>\n\n\n\n From AI Tools\/OpenAI\/Internet<\/p>\n\n\n\n “<\/p>\n\n\n\n Perfect \ud83d\udc4d \u2014 here\u2019s a copyright-free<\/strong> write-up of the Factory Pattern<\/strong> in Java that matches the same style as the Builder Pattern post, so you can share both on Facebook or your blog<\/strong>.<\/p>\n\n\n\n The Factory Pattern<\/strong> is a creational design pattern<\/strong> that provides a way to create objects without exposing the creation logic<\/strong> to the client. Instead of directly calling a constructor, you use a factory method that decides which object to return.<\/p>\n\n\n\n You should use the Factory Pattern when:<\/p>\n\n\n\n \u2714\ufe0f Encapsulation of object creation<\/strong> logic. \u2705 Output:<\/strong><\/p>\n\n\n\n ShapeFactory factory = new ShapeFactory();\n\n Shape shape1 = factory.getShape(\"circle\");\n Shape shape2 = factory.getShape(\"square\");\n Shape shape3 = factory.getShape(\"rectangle\");\n\n shape1.draw();\n shape2.draw();\n shape3.draw();<\/code><\/pre>\n\n\n\n
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\n\n\n\n\u2699\ufe0f Java Design Patterns \u2013 Factory Pattern<\/h2>\n\n\n\n
\ud83d\udd39 Definition<\/h3>\n\n\n\n
\n\n\n\n\ud83d\udd39 Use Cases<\/h3>\n\n\n\n
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\n\n\n\n\ud83d\udd39 Advantages<\/h3>\n\n\n\n
\u2714\ufe0f Makes code easier to extend<\/strong> when adding new object types.
\u2714\ufe0f Promotes loose coupling<\/strong> (client depends on interface, not implementation).
\u2714\ufe0f Simplifies maintenance and testing<\/strong>.
\u2714\ufe0f Encourages code reuse<\/strong>.<\/p>\n\n\n\n
\n\n\n\n\ud83d\udd39 Example in Java<\/h3>\n\n\n\n
\/\/ Product Interface\ninterface Shape {\n void draw();\n}\n\n\/\/ Concrete Products\nclass Circle implements Shape {\n public void draw() {\n System.out.println(\"Drawing a Circle.\");\n }\n}\n\nclass Square implements Shape {\n public void draw() {\n System.out.println(\"Drawing a Square.\");\n }\n}\n\nclass Rectangle implements Shape {\n public void draw() {\n System.out.println(\"Drawing a Rectangle.\");\n }\n}\n\n\/\/ Factory Class\nclass ShapeFactory {\n public Shape getShape(String shapeType) {\n if (shapeType == null) return null;\n switch (shapeType.toLowerCase()) {\n case \"circle\": return new Circle();\n case \"square\": return new Square();\n case \"rectangle\": return new Rectangle();\n default: return null;\n }\n }\n}\n\n\/\/ Usage\npublic class FactoryPatternExample {\n public static void main(String[] args) {\n ShapeFactory factory = new ShapeFactory();\n\n Shape shape1 = factory.getShape(\"circle\");\n Shape shape2 = factory.getShape(\"square\");\n Shape shape3 = factory.getShape(\"rectangle\");\n\n shape1.draw();\n shape2.draw();\n shape3.draw();\n }\n}\n<\/code><\/pre>\n\n\n\n
\n\n\n\nDrawing a Circle.\nDrawing a Square.\nDrawing a Rectangle.\n<\/code><\/pre>\n\n\n\n
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