Web Reference: Jan 8, 2024 · Observer is a behavioral design pattern. It specifies communication between objects: observable and observers. An observable is an object which notifies observers about the changes in its state. For example, a news agency can notify channels when it receives news. Jul 23, 2025 · Observer Design Pattern is a behavioral design pattern where an object, known as the subject, maintains a list of its dependents, called observers, that are notified of any changes in the subject's state. This pattern is often used to implement distributed event handling systems. Observer pattern in Java. Full code example in Java with detailed comments and explanation. Observer is a behavioral design pattern that allows some objects to notify other objects about changes in their state.
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