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\pdfinfo{
  /Title (object-oriented-rules.pdf)
  /Creator (Cheatography)
  /Author ({[}deleted{]})
  /Subject (Object Oriented Rules Cheat Sheet)
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\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{C}
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    {\parbox{\dimexpr\textwidth-2\fboxsep\relax}{\noindent
        \hspace*{-6pt}\includegraphics[width=5.8cm]{/web/www.cheatography.com/public/images/cheatography_logo.pdf}}
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\begin{tabulary}{11cm}{L}
    \vspace{-2pt}\large{\bf{\textcolor{DarkBackground}{\textrm{Object Oriented Rules Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{{[}deleted{]}} via \textcolor{DarkBackground}{\uline{cheatography.com/24206/cs/5557/}}}
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\noindent
\begin{multicols}{3}
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  \mymulticolumn{2}{p{5.377cm}}{\bf\textcolor{white}{Cheatographer}}  \\
  \vspace{-2pt}{[}deleted{]} \\
  \uline{cheatography.com/deleted-24206} \\
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  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Published 28th October, 2015.\\
   Updated 28th May, 2017.\\
   Page {\thepage} of \pageref{LastPage}.
\end{tabulary}
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  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Sponsor}}  \\
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  \vspace{-5pt}
  %\includegraphics[width=48px,height=48px]{dave.jpeg}
  Measure your website readability!\\
  www.readability-score.com
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\begin{document}
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\begin{multicols*}{3}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{SOLID}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{\{\{link="http://www.blackwasp.co.uk/SRP.aspx"\}\}{\bf{Single Responsibility Principle}}\{\{/link\}\}} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}A class changes for only one reason} \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{\{\{link="http://www.blackwasp.co.uk/OCP.aspx"\}\}{\bf{Open/Closed Principle}}\{\{/link\}\}} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}A class should be open for extension, closed for editing} \tn 
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% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{\{\{link="http://www.blackwasp.co.uk/LSP.aspx"\}\}{\bf{Liskov's Substitution Principle}}\{\{/link\}\}} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}Derived types should cleanly and easily replace base types} \tn 
% Row Count 11 (+ 4)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{\{\{link="http://www.blackwasp.co.uk/ISP.aspx"\}\}{\bf{Interface Segregation Principle}}\{\{/link\}\}} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}Favor multiple single-purpose interfaces over composite} \tn 
% Row Count 15 (+ 4)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{\{\{link="http://www.blackwasp.co.uk/DIP.aspx"\}\}{\bf{Dependency Inversion Principle}}\{\{/link\}\}} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}Concrete classes depend on abstractions, not vice-versa} \tn 
% Row Count 19 (+ 4)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{\{\{link="http://www.blackwasp.co.uk/SOLID.aspx"\}\}SOLID principles\{\{/link\}\}}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Common Refactorings}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Encapsulate Field} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{Generalize Type} \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Type-Checking ⇒ State/Strategy} \tn 
% Row Count 3 (+ 1)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{Conditional ⇒ Polymorphism} \tn 
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% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Extract Method} \tn 
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% Row 5
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{Extract Class} \tn 
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% Row 6
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Move/Rename Method or Field} \tn 
% Row Count 7 (+ 1)
% Row 7
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{Move to Superclass/Subclass} \tn 
% Row Count 8 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{\{\{link="http://refactoring.com/catalog/"\}\}More Refactorings\{\{/link\}\}}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Basic OO Terms}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{{\bf{Abstraction}}} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}The process of separating ideas from specific instances of those ideas at work.} \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{{\bf{Polymorphism}}} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}The provision of a single interface to entities of different types. Subtyping.} \tn 
% Row Count 6 (+ 3)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{{\bf{Inheritance}}} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}When an object or class is based on another object or class, using the same implementation; it is a mechanism for code reuse. The relationships of objects or classes through inheritance give rise to a hierarchy.} \tn 
% Row Count 12 (+ 6)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{{\bf{Encapsulation}}} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}Enclosing objects in a common interface in a way that makes them interchangeable, and guards their states from invalid changes.} \tn 
% Row Count 16 (+ 4)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Other Principles}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{{\bf{DRY - Don't repeat yourself}}} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}Duplication should be abstracted} \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{{\bf{Hollywood Principle}}} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}"Don't call us, we'll call you"} \tn 
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% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{{\bf{YAGNI - You Ain't Gonna Need It}}} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}Only code what you need now} \tn 
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% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{{\bf{KISS - Keep it simple, stupid!}}} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}Favor clarity over cleverness} \tn 
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% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{{\bf{Law of Demeter}}} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}Only talk to related classes} \tn 
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% Row 5
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{{\bf{Convention Over Configuration}}} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}Defaults cover 90\% of uses} \tn 
% Row Count 12 (+ 2)
% Row 6
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{{\bf{Encapsulation}}} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}What happens in Vegas...} \tn 
% Row Count 14 (+ 2)
% Row 7
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{{\bf{Design By Contract}}} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}And then write tests} \tn 
% Row Count 16 (+ 2)
% Row 8
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{{\bf{Low Coupling}}} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}Minimize the dependencies} \tn 
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% Row 9
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{{\bf{Common Closure Principle}}} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}Classes that change together, stay together} \tn 
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% Row 10
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{{\bf{Avoid Premature Optimization}}} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}Don't even think about optimization unless your code is working} \tn 
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% Row 11
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{{\bf{Separation of Concerns}}} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}Different functionalities are distinctly managed} \tn 
% Row Count 26 (+ 3)
% Row 12
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{{\bf{Embrace Change}}} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}Expect and welcome any changes} \tn 
% Row Count 28 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
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\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Basic Principles}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Encapsulate what varies} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{Code to an interface rather than to an implementation} \tn 
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\mymulticolumn{1}{x{5.377cm}}{Each class in your application should have only one reason to change} \tn 
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\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{Classes are about behavior and functionality} \tn 
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\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
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\begin{tabularx}{5.377cm}{x{3.53367 cm} x{1.44333 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Design Patterns}}  \tn
% Row 0
\SetRowColor{LightBackground}
\{\{link="http://www.blackwasp.co.uk/AbstractFactory.aspx"\}\}{\bf{Abstract Factory}}\{\{/link\}\} & Creational \tn 
% Row Count 4 (+ 4)
% Row 1
\SetRowColor{white}
\{\{link="http://www.blackwasp.co.uk/Builder.aspx"\}\}{\bf{Builder}}\{\{/link\}\} & Creational \tn 
% Row Count 7 (+ 3)
% Row 2
\SetRowColor{LightBackground}
\{\{link="http://www.blackwasp.co.uk/FactoryMethod.aspx"\}\}{\bf{Factory Method}}\{\{/link\}\} & Creational \tn 
% Row Count 10 (+ 3)
% Row 3
\SetRowColor{white}
\{\{link="http://www.blackwasp.co.uk/Prototype.aspx"\}\}{\bf{Prototype}}\{\{/link\}\} & Creational \tn 
% Row Count 13 (+ 3)
% Row 4
\SetRowColor{LightBackground}
\{\{link="http://www.blackwasp.co.uk/Singleton.aspx"\}\}{\bf{Singleton}}\{\{/link\}\}\{\{bb\}\} & Creational\{\{bb\}\} \tn 
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% Row 5
\SetRowColor{white}
\{\{link="http://www.blackwasp.co.uk/Adapter.aspx"\}\}{\bf{Adapter}}\{\{/link\}\} & Structural \tn 
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\{\{link="http://www.blackwasp.co.uk/Bridge.aspx"\}\}{\bf{Bridge}}\{\{/link\}\} & Structural \tn 
% Row Count 22 (+ 3)
% Row 7
\SetRowColor{white}
\{\{link="http://www.blackwasp.co.uk/Composite.aspx"\}\}{\bf{Composite}}\{\{/link\}\} & Structural \tn 
% Row Count 25 (+ 3)
% Row 8
\SetRowColor{LightBackground}
\{\{link="http://www.blackwasp.co.uk/Decorator.aspx"\}\}{\bf{Decorator}}\{\{/link\}\} & Structural \tn 
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% Row 9
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\{\{link="http://www.blackwasp.co.uk/Facade.aspx"\}\}{\bf{Facade}}\{\{/link\}\} & Structural \tn 
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\begin{tabularx}{5.377cm}{x{3.53367 cm} x{1.44333 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Design Patterns (cont)}}  \tn
% Row 10
\SetRowColor{LightBackground}
\{\{link="http://www.blackwasp.co.uk/Flyweight.aspx"\}\}{\bf{Flyweight}}\{\{/link\}\} & Structural \tn 
% Row Count 3 (+ 3)
% Row 11
\SetRowColor{white}
\{\{link="http://www.blackwasp.co.uk/Proxy.aspx"\}\}{\bf{Proxy}}\{\{/link\}\}\{\{bb\}\} & Structural\{\{bb\}\} \tn 
% Row Count 6 (+ 3)
% Row 12
\SetRowColor{LightBackground}
\{\{link="http://www.blackwasp.co.uk/ChainOfResponsibility.aspx"\}\}{\bf{Chain of Responsibility}}\{\{/link\}\} & Behavioral \tn 
% Row Count 10 (+ 4)
% Row 13
\SetRowColor{white}
\{\{link="http://www.blackwasp.co.uk/Command.aspx"\}\}{\bf{Command}}\{\{/link\}\} & Behavioral \tn 
% Row Count 13 (+ 3)
% Row 14
\SetRowColor{LightBackground}
\{\{link="http://www.blackwasp.co.uk/Interpreter.aspx"\}\}{\bf{Interpreter}}\{\{/link\}\} & Behavioral \tn 
% Row Count 16 (+ 3)
% Row 15
\SetRowColor{white}
\{\{link="http://www.blackwasp.co.uk/Iterator.aspx"\}\}{\bf{Iterator}}\{\{/link\}\} & Behavioral \tn 
% Row Count 19 (+ 3)
% Row 16
\SetRowColor{LightBackground}
\{\{link="http://www.blackwasp.co.uk/Mediator.aspx"\}\}{\bf{Mediator}}\{\{/link\}\} & Behavioral \tn 
% Row Count 22 (+ 3)
% Row 17
\SetRowColor{white}
\{\{link="http://www.blackwasp.co.uk/Memento.aspx"\}\}{\bf{Memento}}\{\{/link\}\} & Behavioral \tn 
% Row Count 25 (+ 3)
% Row 18
\SetRowColor{LightBackground}
\{\{link="http://www.blackwasp.co.uk/Observer.aspx"\}\}{\bf{Observer}}\{\{/link\}\} & Behavioral \tn 
% Row Count 28 (+ 3)
% Row 19
\SetRowColor{white}
\{\{link="http://www.blackwasp.co.uk/State.aspx"\}\}{\bf{State}}\{\{/link\}\} & Behavioral \tn 
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\end{tabularx}
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\begin{tabularx}{5.377cm}{x{3.53367 cm} x{1.44333 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Design Patterns (cont)}}  \tn
% Row 20
\SetRowColor{LightBackground}
\{\{link="http://www.blackwasp.co.uk/Strategy.aspx"\}\}{\bf{Strategy}}\{\{/link\}\} & Behavioral \tn 
% Row Count 3 (+ 3)
% Row 21
\SetRowColor{white}
\{\{link="http://www.blackwasp.co.uk/TemplateMethod.aspx"\}\}{\bf{Template Method}}\{\{/link\}\} & Behavioral \tn 
% Row Count 7 (+ 4)
% Row 22
\SetRowColor{LightBackground}
\{\{link="http://www.blackwasp.co.uk/Visitor.aspx"\}\}{\bf{Visitor}}\{\{/link\}\} & Behavioral \tn 
% Row Count 10 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Favor the following over inheritance}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{{\bf{Delegation}}} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}When you hand over the responsibility for a particular task to another class or method.} \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{{\bf{Composition}}} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}Use behavior from a family of other classes, and change that behavior at runtime.} \tn 
% Row Count 6 (+ 3)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{{\bf{Aggregation}}} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}When one class is used as part of another class, but still exists outside of that other class.} \tn 
% Row Count 9 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
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\begin{tabularx}{5.377cm}{x{1.74195 cm} x{3.23505 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Access Modifiers}}  \tn
% Row 0
\SetRowColor{LightBackground}
{\bf{Private}} & Only inside the same class instance \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
{\bf{Protected}} & Inside same or derived class instances \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
{\bf{Public}} & All other classes linking/referencing the class \tn 
% Row Count 7 (+ 3)
% Row 3
\SetRowColor{white}
{\bf{Internal}} & Only other classes in the same assembly \tn 
% Row Count 9 (+ 2)
% Row 4
\SetRowColor{LightBackground}
{\bf{Protected Internal}} & All classes in same assembly, or derived classes in other assembly \tn 
% Row Count 12 (+ 3)
% Row 5
\SetRowColor{white}
{\bf{Static}} & Accessible on the class itself (can combine with other accessors) \tn 
% Row Count 15 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}


% That's all folks
\end{multicols*}

\end{document}