Observer method
Observer Method is a Behavioral Design Pattern, it defines a one-to-many dependency between objects, so that when one object (the subject) changes state, all its dependents (observers) are notified and updated automatically.
Design Patterns in Java | Java Design Patterns Tutorial
Design patterns in Java help developers create more maintainable, flexible, and understandable code. They encapsulate the expertise and experience of seasoned software architects and developers, making it easier for newer programmers to follow established best practices.
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