Observer: Implementation and Example

Learn the Observer design pattern by implementing an example program.

In this example, we’ll see how easily Observer objects can subscribe to events and unsubscribe from them. Similar to all other examples, we’ll use the console application template for this demo.

Adding interfaces

First, we’ll add an interface for our Subject object. This interface would allow Observer objects to subscribe and unsubscribe. We can also use this interface to notify all the Observer objects subscribed to the Subject object.

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