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Line 3: === Factory design pattern in Java === The Factory pattern is useful to solve a common problem: Very often you'll have to construct an [[Object (computer science)\|object]], based on some [[input]], and the [[function (programming)\|function]]s inside the object will depend upon the input. A good example would be a [[class (computer science)\|class]] to read [[image file]]s and make [[thumbnail]]s out of them. You could, of course, bung them all into one class and have it decide which bit of code to run on its own:

Factory method pattern: Difference between revisions