The Abstract Factory pattern

Problem: Instantiate families of objects.
Solution: The Abstract Factory pattern defines the interface for how to create each member of the family.

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public interface WindowFactory {     Window createWindow(); // implicitly public }

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public MsWindowFactory implements WindowFactory {     @Override public Window createWindow() {         return new MsWindow();     } }

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public AppleWindowFactory implements WindowFactory {     @Override public Window createWindow() {         return new AppleWindow();     } }

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public Client {     public static void main(String[] args) {           WindowFactory  factory;         String osName = System.getProperty("os.name");         if ((osName != null) && (osName.indexOf("Windows") != -1)) {             factory = new MsWindowFactory();         } else {             factory = new AppleWindowFactory();         }           Window window = factory.createWindow();     } }