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The Observer pattern is a foundational behavioral design pattern that enables loose coupling between components by defining a one-to-many dependency between objects: when one object (the subject) changes state, all its dependents (observers) are automatically notified and updated. This pattern underpins many event-handling systems in Java, incl ...

The Observer design pattern establishes a one-to-many dependency between objects, ensuring that when a subject changes state, all its registered dependents are automatically notified and updated. This behavioral pattern decouples the publisher from its subscribers, enabling flexible system architectures where components can react to external ev ...

The proxy pattern provides a surrogate or placeholder for another object to control access to it. It is useful when a client object cannot or should not directly reference the target object, and the proxy acts as an intermediary. The core idea is to add additional behavior around the target's logic without modifying the target class itself. For ...