Pattern · Core

Factory Method

Define a method for creating an object, but let SUBCLASSES decide which concrete class to instantiate — so the creator code never names a product directly.

Asked atAmazonMicrosoftUber

step 1 / 11

1/2Hard-wired new

Dialog

+ render()

Hard-wired new

 1class Dialog {
 2    void render() {
 3        Button b = new WindowsButton();   // hard-coded concrete
 4        b.onClick();
 5    }
 6}

State

createsnew WindowsButton() 💥

✦

Dialog.render() does `new WindowsButton()` directly — the layout class names a concrete widget.