The Singleton, Factory Method, Adapter, Composite, and Observer design patterns are all demonstrated together.
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Singleton ensures that there is only one instance of the Singleton class.
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Factory Method is used to create objects based on a common interface.
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Adapter allows the
AdapterLegacySystemto adapt the legacy system's interface to the Product interface. -
Composite represents a part-whole hierarchy with Component, Leaf, and Composite classes.
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Observer defines a one-to-many relationship between the Subject and multiple Observer objects.
This example showcases the integration of these design patterns into a single application, illustrating how they can work together in a cohesive manner.