What is Factory Method?
A method that lets subclasses decide which concrete type to build while sharing the same creation steps.
same steps · subclass picks die
Factory method delegates type choice to…
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In real work
Factory method: Document.createExporter() picks PDF or CSV based on the document subclass.
In the illustration
Feed, press and eject run identically twice: first with the PDF document's die cartridge slotted in, then the CSV document's; out come a PDF exporter and then a CSV exporter.
Replace the switch statement that builds exporters in your coding agent with a factory method on the Exporter base type, so a new format means one new subclass and no edits to callers.
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