\documentclass[10pt,a4paper]{article}

% Packages
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\usepackage{multicol}           % Allows multicols in tables
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\usepackage{colortbl}           % For coloured tables
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\usepackage{lastpage}           % Needed for total page number
\usepackage{seqsplit}           % Splits long words.
%\usepackage{opensans}          % Can't make this work so far. Shame. Would be lovely.
\usepackage[normalem]{ulem}     % For underlining links
% Most of the following are not required for the majority
% of cheat sheets but are needed for some symbol support.
\usepackage{amsmath}            % Symbols
\usepackage{MnSymbol}           % Symbols
\usepackage{wasysym}            % Symbols
%\usepackage[english,german,french,spanish,italian]{babel}              % Languages

% Document Info
\author{matiwan}
\pdfinfo{
  /Title (java-for-testers.pdf)
  /Creator (Cheatography)
  /Author (matiwan)
  /Subject (Java for Testers Cheat Sheet)
}

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% Commands
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% Header and Footer
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\fancyhead{} % Set header to blank
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\fancyhead[L]{
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{C}
    \SetRowColor{DarkBackground}
    \vspace{-7pt}
    {\parbox{\dimexpr\textwidth-2\fboxsep\relax}{\noindent
        \hspace*{-6pt}\includegraphics[width=5.8cm]{/web/www.cheatography.com/public/images/cheatography_logo.pdf}}
    }
\end{tabulary}
\columnbreak
\begin{tabulary}{11cm}{L}
    \vspace{-2pt}\large{\bf{\textcolor{DarkBackground}{\textrm{Java for Testers Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{matiwan} via \textcolor{DarkBackground}{\uline{cheatography.com/33684/cs/15111/}}}
\end{tabulary}
\end{multicols}}

\fancyfoot[L]{ \footnotesize
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{LL}
  \SetRowColor{FootBackground}
  \mymulticolumn{2}{p{5.377cm}}{\bf\textcolor{white}{Cheatographer}}  \\
  \vspace{-2pt}matiwan \\
  \uline{cheatography.com/matiwan} \\
  \end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Not Yet Published.\\
   Updated 15th June, 2018.\\
   Page {\thepage} of \pageref{LastPage}.
\end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Sponsor}}  \\
  \SetRowColor{white}
  \vspace{-5pt}
  %\includegraphics[width=48px,height=48px]{dave.jpeg}
  Measure your website readability!\\
  www.readability-score.com
\end{tabulary}
\end{multicols}}




\begin{document}
\raggedright
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% Set font size to small. Switch to any value
% from this page to resize cheat sheet text:
% www.emerson.emory.edu/services/latex/latex_169.html
\footnotesize % Small font.

\begin{multicols*}{3}

\begin{tabularx}{5.377cm}{x{2.58804 cm} x{2.38896 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Shortcuts IntelliJ}}  \tn
% Row 0
\SetRowColor{LightBackground}
Show Parameters & cmd + p \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
Show JavaDoc & ctrl + j \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
Show shortcuts & cmd + j \tn 
% Row Count 3 (+ 1)
% Row 3
\SetRowColor{white}
Show popup definition & alt + space \tn 
% Row Count 5 (+ 2)
% Row 4
\SetRowColor{LightBackground}
Toggle all methods body & cmd + shift + - \tn 
% Row Count 7 (+ 2)
% Row 5
\SetRowColor{white}
Expand all methods body & cmd + shift + '+' \tn 
% Row Count 9 (+ 2)
% Row 6
\SetRowColor{LightBackground}
Todo list & Todo comment; cmd + / \tn 
% Row Count 11 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{1.74195 cm} x{3.23505 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{JUnit}}  \tn
% Row 0
\SetRowColor{LightBackground}
Import Junit & import org.junit.Test; \tn 
% Row Count 1 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Dictionary}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{{\bf{Autoboxing}} is the automatic conversion that the Java compiler makes between the primitive types and their corresponding object wrapper classes. For example, converting an int to an Integer, a double to a Double, and so on. If the conversion goes the other way, this is called {\bf{unboxing}}.} \tn 
% Row Count 6 (+ 6)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{Class- fields, methods change object properties} \tn 
% Row Count 7 (+ 1)
% Row 2
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\mymulticolumn{1}{x{5.377cm}}{Instantiate Class} \tn 
% Row Count 8 (+ 1)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{A {\bf{static method}} operates at the class level, rather than the instance or object level. Which means that we don't have to instantiate the class into a variable in order to call a static method.} \tn 
% Row Count 12 (+ 4)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Superclass} \tn 
% Row Count 13 (+ 1)
% Row 5
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{\{\{link="https://docs.oracle.com/javase/tutorial/java/javaOO/accesscontrol.html"\}\}Access control\{\{/link\}\}} \tn 
% Row Count 16 (+ 3)
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\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Constructor}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{`access ClassName(arguments)\{` \newline % Row Count 1 (+ 1)
`\}` \newline % Row Count 2 (+ 1)
Invoking another constructor \newline % Row Count 3 (+ 1)
`access ClassName(arguments)\{` \newline % Row Count 4 (+ 1)
`this(arguments);` \newline % Row Count 5 (+ 1)
`\}`% Row Count 6 (+ 1)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
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\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{0.84609 cm} x{4.13091 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Collection interface}}  \tn
% Row 0
\SetRowColor{LightBackground}
{\bf{Set}} & a collection that does not allow duplicates \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
{\bf{List}} & a collection you can access and add elements at specific index positions \tn 
% Row Count 5 (+ 3)
% Row 2
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{\bf{Map}} & a "key, value" pair where you store an object in the collection, but can access it with a unique key \tn 
% Row Count 9 (+ 4)
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\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Access}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{public {\bf{static final}} String CONSTANT = "a constant string";  \newline public static String aClassField = "a class field";  \newline {\bf{protected}} static String proField = "a class field";  \newline public String pubField = "a public field"; \newline {\bf{private}} String privField = "a private field";  \newline private String name; \newline  \newline private/public/protected/ package-private(default)} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
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\begin{tabularx}{5.377cm}{p{0.4977 cm} p{0.4977 cm} }
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\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Type of asserts}}  \tn
% Row 0
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\mymulticolumn{2}{x{5.377cm}}{assertEquals} \tn 
% Row Count 1 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
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\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Switch statement}}  \tn
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\mymulticolumn{1}{x{5.377cm}}{A switch works with the byte, short, char, and int primitive data types. It also works with enumerated types (discussed in Enum Types), the String class, and a few special classes that wrap certain primitive types: Character, Byte, Short, and Integer (discussed in Numbers and Strings). \newline % Row Count 6 (+ 6)
The String in the switch expression is compared with the expressions associated with each case label as if the String.equals method were being used.% Row Count 9 (+ 3)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
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\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{1.24425 cm} x{3.73275 cm} }
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\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Import}}  \tn
% Row 0
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Static usage & import \seqsplit{com.javafortesters.domainobject.TestAppEnv;} \{\{nl\}\} TestEnv.method(); \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
Static import & import static \seqsplit{org.junit.Assert.assertEquals;} \{\{nl\}\} \textasciitilde{}\textasciitilde{}Assert.\textasciitilde{}\textasciitilde{} assertEquals('a', 'b', 'c'); \tn 
% Row Count 7 (+ 4)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
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\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Inheritance}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{Private methods and fields are not accessible through inheritance, only the super class's {\bf{protected}} and {\bf{public}} fields and methods are accessible through inheritance.% Row Count 4 (+ 4)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
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\begin{tabularx}{5.377cm}{X}
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{JavaDoc}}  \tn
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\mymulticolumn{1}{x{5.377cm}}{@Test \newline public void aJavaDocComment()\{ \seqsplit{assertTrue(addTwoNumbers(4},3)==7); \newline \} \newline     /{\bf{ \newline      {\emph{ Add two integers and return an int. \newline      }} \newline      {\emph{ There is a risk of overflow since two big \newline      }} integers would max out the return int. \newline      {\emph{ \newline      }} @param a is the first number to add \newline      {\emph{ @param b is the second number to add \newline      }} @return a+b as an int \newline      {\emph{/ \newline public int addTwoNumbers(int a, int b)\{ return a+b; \newline \} \newline  \newline //click at the name of function and press }}ctrl+j}}*} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
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\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Good practices}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{When you encounter: \newline % Row Count 1 (+ 1)
• any Java library that you don't know how to use \newline % Row Count 3 (+ 2)
• parts of Java that you are unsure of \newline % Row Count 4 (+ 1)
• code on your team that you didn't write and don't understand \newline % Row Count 6 (+ 2)
Then you can: \newline % Row Count 7 (+ 1)
• read the documentation - ctrl + q (ctrl + j on Mac) or on-line web docs \newline % Row Count 9 (+ 2)
• read the source - ctrl and click on the method, to see the source \newline % Row Count 11 (+ 2)
• write some @Test annotated methods, with assertions, to help you explore the \newline % Row Count 13 (+ 2)
functionality of the library \newline % Row Count 14 (+ 1)
When writing the @Test methods you need to keep the following in mind: \newline % Row Count 16 (+ 2)
• write just enough code to trigger the functionality \newline % Row Count 18 (+ 2)
• ensure you write assertion statements that cover the functionality well and are \newline % Row Count 20 (+ 2)
readable \newline % Row Count 21 (+ 1)
• experiment with 'odd' circumstances% Row Count 22 (+ 1)
} \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}{Design Inheritance}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{Inheritance \newline % Row Count 1 (+ 1)
class Fruit \{ \newline % Row Count 2 (+ 1)
    //... \newline % Row Count 3 (+ 1)
\} \newline % Row Count 4 (+ 1)
class Apple extends Fruit \{ \newline % Row Count 5 (+ 1)
    //... \newline % Row Count 6 (+ 1)
\}% Row Count 7 (+ 1)
} \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}{Design Composition}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{using instance variables that are references to other objects \newline % Row Count 2 (+ 2)
class Fruit \{ \newline % Row Count 3 (+ 1)
    //... \newline % Row Count 4 (+ 1)
\} \newline % Row Count 5 (+ 1)
class Apple \{ \newline % Row Count 6 (+ 1)
    private Fruit fruit = new Fruit(); \newline % Row Count 7 (+ 1)
    //... \newline % Row Count 8 (+ 1)
\} \newline % Row Count 9 (+ 1)
In a composition relationship, the front-end class holds a reference in one of its instance variables to a back-end class.% Row Count 12 (+ 3)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{\seqsplit{https://www.artima.com/designtechniques/compoinh3.html}}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}


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

\end{document}