Is this a UML Diagram? (As used in Design Patterns)

I want to learn about Design Patterns and everywhere I see diagrams like this:

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Is it UML or something else? I just need a quick reference to learn what do each of different lines mean? which one is inheritance, etc..

Solution

1 Yes it is UML. You can read more (with examples) about class diagrams and other UML diagrams e.g. at http://www.uml-diagrams.org/class-diagrams-overview.html

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2 Although it is possible to Google out and print and pin up on your notice board some "UML cheat sheet" or "UML quick reference card" (e.g. http://www.holub.com/goodies/uml).

3 it is much better to first read a good book so that you know what is/is_not possible what is the structural/behavioral modeling etc. Explaining UML is not a thing that can be done on 1 single sheet of paper or in one single Stack Overflow answer