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Java Design Patterns can be categorized into three categories: Creational, Structural, and Behavioral.
Creational patterns are used for creating objects. Some examples of Creational patterns are Singleton, Factory, and Abstract Factory.
Structural patterns are used for assembling objects and creating relationships between them. Some examples of Structural patterns are Adapters, bridges, and Composites.
Behavioral patterns are used for managing algorithms, relationships, and responsibilities between objects. Some examples of Behavioral patterns are Observer, Strategy, and Template Methods.