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\author{kdf}
\pdfinfo{
  /Title (oop-midterm-cst8288.pdf)
  /Creator (Cheatography)
  /Author (kdf)
  /Subject (OOP Midterm (CST8288) Cheat Sheet)
}

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\noindent
\begin{multicols}{3}
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    \vspace{-7pt}
    {\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{OOP Midterm (CST8288) Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{kdf} via \textcolor{DarkBackground}{\uline{cheatography.com/214219/cs/46628/}}}
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  \mymulticolumn{2}{p{5.377cm}}{\bf\textcolor{white}{Cheatographer}}  \\
  \vspace{-2pt}kdf \\
  \uline{cheatography.com/kdf} \\
  \end{tabulary}
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  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Not Yet Published.\\
   Updated 20th June, 2025.\\
   Page {\thepage} of \pageref{LastPage}.
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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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\end{multicols}}




\begin{document}
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\begin{multicols*}{2}

\begin{tabularx}{8.4cm}{x{0.864 cm} x{1.944 cm} x{2.16 cm} x{2.232 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{4}{x{8.4cm}}{\bf\textcolor{white}{Factory Design Patterns - Table}}  \tn
% Row 0
\SetRowColor{LightBackground}
{\emph{Feature}} & {\bf{Simple}} & {\bf{Factory}} & {\bf{Abstract}} \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
{\bf{Creation}} & Single factory class & Delegated to subclasses via \seqsplit{polymorphism} & Interface for families of related objects \tn 
% Row Count 7 (+ 4)
% Row 2
\SetRowColor{LightBackground}
{\bf{Inheritance}} & None & Extends the factory class & Each concrete is a varient \tn 
% Row Count 11 (+ 4)
% Row 3
\SetRowColor{white}
{\bf{Flexibility}} & Less flexible, \seqsplit{modifications} needed & Highly flexible, follows Open/Closed & \seqsplit{Compatibility} and consistency \tn 
% Row Count 15 (+ 4)
% Row 4
\SetRowColor{LightBackground}
{\bf{Complexity}} & Simple & More complex, requires inheritance and \seqsplit{polymorphism} & Complex, involves multiple factories \tn 
% Row Count 20 (+ 5)
\hhline{>{\arrayrulecolor{DarkBackground}}----}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Simple Factory Characteristics - Creational}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{{\bf{Centralized Factory}}: Single method/class creates all objects.} \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{{\bf{Simple Structure}}: Used for systems with limited number of object types.} \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{e.g. Switch statement to run each constructor.} \tn 
% Row Count 5 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{Use when you have a small, fixed number of object types and won't need to extend.}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Abstract Factory Elements - Creational}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{{\bf{Abstract Factory (interface)}}: Set of creation methods. Each for different abstract product.} \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{{\bf{Concrete Factory}}: Implements creation methods. Each CF corresponds to variant of product.} \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{{\bf{Abstract Product}}: Interface for set of distinct but related products.} \tn 
% Row Count 6 (+ 2)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{{\bf{Concrete Product}}: Implements abstract products, {\emph{grouped by variant}}. Each abstract product (e.g. sofa/chair) must be {\emph{implemented in all variants}} (e.g. Victorian/Modern).} \tn 
% Row Count 10 (+ 4)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{Use when code needs to work with families of related products but don't want to depend on concrete classes.}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Singleton - Creational}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{Only one class instance (e.g. db connection, logs) created.} \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{{\bf{Race Condition}}: Two threads change same data at same time causes weird results.} \tn 
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% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{{\bf{Thread-Safe}}: keyword {\emph{Synchronized}}.} \tn 
% Row Count 5 (+ 1)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{{\bf{Double-Checked Locking}}: check criteria before getting lock.} \tn 
% Row Count 7 (+ 2)
% Row 4
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\mymulticolumn{1}{x{8.4cm}}{{\bf{Disadvantages}}: Global state, tight-coupling (anti-pattern).} \tn 
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\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Design Patterns}}  \tn
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\mymulticolumn{1}{x{8.4cm}}{Solutions to {\emph{common problems}}. Guideline, not strict.} \tn 
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\mymulticolumn{1}{x{8.4cm}}{Provides common vocab: helps collaboration.} \tn 
% Row Count 3 (+ 1)
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\mymulticolumn{1}{x{8.4cm}}{{\bf{Creational}}: Right objects created in right situations. {\emph{Instantiation optimization}}.} \tn 
% Row Count 5 (+ 2)
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\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{{\bf{Structural}}: How classes/objects create larger structures. {\emph{System robustness}}.} \tn 
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\mymulticolumn{1}{x{8.4cm}}{{\bf{Behavioral}}: \seqsplit{Interaction/communication} between objects. {\emph{Efficient \& flexible}}.} \tn 
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\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
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\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{OOP Terms}}  \tn
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\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{{\bf{Encapsulation}}: Data + methods.} \tn 
% Row Count 1 (+ 1)
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\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{{\bf{Abstraction}}: Information hiding.} \tn 
% Row Count 2 (+ 1)
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\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{{\bf{Inheritance}}: Sub/super classes.} \tn 
% Row Count 3 (+ 1)
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\mymulticolumn{1}{x{8.4cm}}{{\bf{Polymorphism}}: Treat all subs like super.} \tn 
% Row Count 4 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{OOP Principles}}  \tn
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\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{{\bf{Single Responsibility}}: One job = one reason to change.} \tn 
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% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{{\bf{Dependency Injection}}: Receive dependencies from external source.} \tn 
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\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
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\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{UML Use Case Diagrams}}  \tn
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\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{{\bf{What}} a system does, {\bf{not how}}.} \tn 
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% Row 1
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\mymulticolumn{1}{x{8.4cm}}{Interactions between {\emph{actors and system}}.} \tn 
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\mymulticolumn{1}{x{8.4cm}}{{\bf{Components}}: Actors, use cases (functions), and relationships.} \tn 
% Row Count 4 (+ 2)
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\mymulticolumn{1}{x{8.4cm}}{{\bf{Context}}: Clarifications, constraints, exceptions, references, annotations.} \tn 
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\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
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\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Factory Method Elements - Creational}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{{\bf{Creator {\emph{(abstract)}}}}: Declares factory method.} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{{\bf{Concrete Creator}}: Implements factory method.} \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{{\bf{Product {\emph{(interface)}}}}: For objects created by factory method.} \tn 
% Row Count 4 (+ 2)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{{\bf{Concrete Product}}: Implements product interface.} \tn 
% Row Count 6 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{Use when you need to create objects without specific class or expect product types to expand later.}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Builder - Creational}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{Separated construction from representation. Useful for objects that have many optional components. Allows method call chaining.} \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{{\bf{Builder Interface}}: Define methods for building.} \tn 
% Row Count 5 (+ 2)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{{\bf{Concrete Builders}}: Implement interface.} \tn 
% Row Count 6 (+ 1)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{{\bf{Director {\emph{(optional)}}}}: Order and use of build instructions.} \tn 
% Row Count 8 (+ 2)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{{\bf{Product}}: Object that is constructed.} \tn 
% Row Count 9 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
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\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{DAO - Structural}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{From Core J2EE: separates business/domain logic.} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{{\bf{Primary Functions}}: Create, read, update, delete {\emph{(CRUD)}}.} \tn 
% Row Count 3 (+ 2)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{{\bf{Data Source}}: Connection.} \tn 
% Row Count 4 (+ 1)
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\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{{\bf{Domain/Business Object}}:} \tn 
% Row Count 5 (+ 1)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{{\bf{Data Access Object}}: CRUD operations. Abstracts access to DS.} \tn 
% Row Count 7 (+ 2)
% Row 5
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{{\bf{Data Transfer Object}}: Models data (row). Follows Java Bean.} \tn 
% Row Count 9 (+ 2)
% Row 6
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{{\bf{Java Bean Class}}: Default constractor, private vars with get/set. Implements Serializable.} \tn 
% Row Count 11 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
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\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Strategy - Behavioral}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{Defines family of algorithms {\bf{(intent)}}, puts each in separate class resulting in {\emph{interchangeable objects}}.} \tn 
% Row Count 3 (+ 3)
% Row 1
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\mymulticolumn{1}{x{8.4cm}}{Can switch between algorithms at {\bf{runtime}} without altering code.} \tn 
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% Row 2
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\mymulticolumn{1}{x{8.4cm}}{Promotes flexibility, extensibility, and separation of concerns.} \tn 
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% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{{\bf{Strategy Interface}}: Defines set of behaviors all CS must implement.} \tn 
% Row Count 9 (+ 2)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{{\bf{Concrete Strategies}}: Implements SI. Each CS provides specific behavior (algorithm).} \tn 
% Row Count 11 (+ 2)
% Row 5
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{{\bf{Context}}: Class that uses CS (delegates actual work). Contains reference to SI.} \tn 
% Row Count 13 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
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\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{SOLID Principles}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{Purpose: To make software more {\emph{understandable, flexible}}, and{\emph{ maintainable}}.} \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{Modular: Reduces bugs when creating new code.} \tn 
% Row Count 3 (+ 1)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{{\bf{Single Responsibility}}: Classes.} \tn 
% Row Count 4 (+ 1)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{{\bf{Open Closed}}: New features don't alter code.} \tn 
% Row Count 5 (+ 1)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{{\bf{Liskov Substitution}}: Sub substitutable for super.} \tn 
% Row Count 7 (+ 2)
% Row 5
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{{\bf{Interface Substitution}}: Divide large interface into smaller.} \tn 
% Row Count 9 (+ 2)
% Row 6
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{{\bf{Dependency Inversion}}: Depend on abstractions, not concretes.} \tn 
% Row Count 11 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
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\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{UML Sequence Diagrams}}  \tn
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\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{Interaction diagram. How objects interact in particular scenario over time.} \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{Same diagrams from Web last term.} \tn 
% Row Count 3 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}


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

\end{document}