Mediator Vs Observer Object-Oriented Design Patterns

Question

I have been reading the Gang Of Four, in order to solve some of my problems and came across the Mediator pattern.

I had earlier use

Answer 1

Observer

1. Without

• Client1: Hey Subject, when do you change?

• Client2: When did you change Subject? I have not noticed!

• Client3: I know that Subject has changed.

2. With

• Clients are silent.
• Some time later ...
• Subject: Dear clients, I have changed!

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Mediator

1. Without

• Client1: Hey Taxi1, take me some where.
• Client2: Hey Taxi1, take me some where.
• Client1: Hey Taxi2, take me some where.
• Client2: Hey Taxi2, take me some where.

2. With

• Client1: Hey TaxiCenter, please take me a Taxi.
• Client2: Hey TaxiCenter, please take me a Taxi.