\documentclass[10pt,a4paper]{article}

% Packages
\usepackage{fancyhdr}           % For header and footer
\usepackage{multicol}           % Allows multicols in tables
\usepackage{tabularx}           % Intelligent column widths
\usepackage{tabulary}           % Used in header and footer
\usepackage{hhline}             % Border under tables
\usepackage{graphicx}           % For images
\usepackage{xcolor}             % For hex colours
%\usepackage[utf8x]{inputenc}    % For unicode character support
\usepackage[T1]{fontenc}        % Without this we get weird character replacements
\usepackage{colortbl}           % For coloured tables
\usepackage{setspace}           % For line height
\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{Peanuts-83}
\pdfinfo{
  /Title (java-poo.pdf)
  /Creator (Cheatography)
  /Author (Peanuts-83)
  /Subject (JAVA POO Cheat Sheet)
}

% Lengths and widths
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\addtolength{\voffset}{-2cm}
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\setlength{\headheight}{85pt} % If less, LaTeX automatically increases it
\renewcommand{\footrulewidth}{0pt} % Remove footer line
\renewcommand{\headrulewidth}{0pt} % Remove header line
\renewcommand{\seqinsert}{\ifmmode\allowbreak\else\-\fi} % Hyphens in seqsplit
% This two commands together give roughly
% the right line height in the tables
\renewcommand{\arraystretch}{1.3}
\onehalfspacing

% Commands
\newcommand{\SetRowColor}[1]{\noalign{\gdef\RowColorName{#1}}\rowcolor{\RowColorName}} % Shortcut for row colour
\newcommand{\mymulticolumn}[3]{\multicolumn{#1}{>{\columncolor{\RowColorName}}#2}{#3}} % For coloured multi-cols
\newcolumntype{x}[1]{>{\raggedright}p{#1}} % New column types for ragged-right paragraph columns
\newcommand{\tn}{\tabularnewline} % Required as custom column type in use

% Font and Colours
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\definecolor{FootBackground}{HTML}{666666}
\definecolor{TextColor}{HTML}{333333}
\definecolor{DarkBackground}{HTML}{2470A3}
\definecolor{LightBackground}{HTML}{F1F6F9}
\renewcommand{\familydefault}{\sfdefault}
\color{TextColor}

% Header and Footer
\pagestyle{fancy}
\fancyhead{} % Set header to blank
\fancyfoot{} % Set footer to blank
\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 POO Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{Peanuts-83} via \textcolor{DarkBackground}{\uline{cheatography.com/140542/cs/47770/}}}
\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}Peanuts-83 \\
  \uline{cheatography.com/peanuts-83} \\
  \end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Published 7th March, 2026.\\
   Updated 7th March, 2026.\\
   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
\raggedcolumns

% 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*}{2}

\begin{tabularx}{8.4cm}{x{1.8 cm} x{1.8 cm} x{2.448 cm} x{1.152 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{4}{x{8.4cm}}{\bf\textcolor{white}{Types}}  \tn
% Row 0
\SetRowColor{LightBackground}
{\bf{Type primitif}} & {\bf{Taille (bits)}} & {\bf{Valeur par défaut}} & {\bf{Wrapper}} \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
byte & 8 & 0 & Byte \tn 
% Row Count 3 (+ 1)
% Row 2
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short & 16 & 0 & Short \tn 
% Row Count 4 (+ 1)
% Row 3
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int & 32 & 0 & \seqsplit{Integer} \tn 
% Row Count 6 (+ 2)
% Row 4
\SetRowColor{LightBackground}
long & 64 & 0L & Long \tn 
% Row Count 7 (+ 1)
% Row 5
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float & 32 & 0.0f & Float \tn 
% Row Count 8 (+ 1)
% Row 6
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double & 64 & 0.0d & \seqsplit{Double} \tn 
% Row Count 9 (+ 1)
% Row 7
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char & 16 & '\textbackslash{}u000' & \seqsplit{Character} \tn 
% Row Count 11 (+ 2)
% Row 8
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boolean & 1 (non \seqsplit{précisé)} & false & \seqsplit{Boolean} \tn 
% Row Count 13 (+ 2)
% Row 9
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- & 16 (SB capacity) & "" & \seqsplit{String} \tn 
% Row Count 15 (+ 2)
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\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Interface}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{{\emph{valeurs}} public static final / {\emph{méthodes}} public abstract \newline % Row Count 2 (+ 2)
Peut contenir des méthodes {\bf{private}} ou {\bf{default}} qui seront alors implémentées. \newline % Row Count 4 (+ 2)
Overrider ses méthodes ne peut se faire avec un accesor plus restrictif.% Row Count 6 (+ 2)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
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\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Classe}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{{\bf{{\emph{class}} MyClass {\bf{extends}} OtherClass {\bf{implements}} interface1, interface2}} \newline % Row Count 2 (+ 2)
Une classe {\bf{abstract}} n'est pas tenue d'implémenter les méthodes abstraites héritées (classe ou interface), c'est le rôle des classes concrètes. \newline % Row Count 6 (+ 4)
Contient des membres {\bf{static}} et d'{\bf{instance}}. Une méthode statique ne peut accéder qu'aux champs statiques de la classe. \newline % Row Count 9 (+ 3)
Un {\bf{constructeur}} par défaut est fourni à la compilation si aucun n'est fourni. \newline % Row Count 11 (+ 2)
- {\bf{this}} peut invoquer les méthodes overrided ou overloaded \newline % Row Count 13 (+ 2)
- {\bf{super}} invoque les membres des classes parent \newline % Row Count 15 (+ 2)
- Un membre {\bf{final}} doit être initialisée avant celle de la classe (assignation directe, ou par constructeur ou initializer)% Row Count 18 (+ 3)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
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\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{X}
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\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Enum}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{{\emph{valeurs}} public static final \newline % Row Count 1 (+ 1)
Classe particulière contenant des constantes énumérées. Chaque constante est une instance unique de la valeur. \newline % Row Count 4 (+ 3)
Méthodes natives: values() / valuesOf() / name() / ordinal() \newline % Row Count 6 (+ 2)
Peut contenir des champs, constructeurs, méthodes. Peut implémenter des interfaces. \newline % Row Count 8 (+ 2)
Enums spécialisés: {\bf{EnumMap}} et {\bf{EnumSet}}.% Row Count 9 (+ 1)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
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\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Methode}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{Une méthodes peut avoir des {\bf{paramètres}}, mais on lui fournit des {\bf{arguments}}. \newline % Row Count 2 (+ 2)
{\bf{Type d'argument}} \newline % Row Count 3 (+ 1)
- {\bf{Primitive}} - une copie est utilisée sans modifier la valeur originale \newline % Row Count 5 (+ 2)
- {\bf{Wrapper}} - le pointeur modifie l'objet original \newline % Row Count 7 (+ 2)
{\bf{Retour}} \newline % Row Count 8 (+ 1)
Toujours un {\bf{Wrapper}}, jamais une primitive. \newline % Row Count 9 (+ 1)
{\bf{Overloading}} \newline % Row Count 10 (+ 1)
Différentes versions d'une méthode avec des {\bf{signatures différentes}} (paramètres et retour). \newline % Row Count 12 (+ 2)
{\bf{Overriding}} \newline % Row Count 13 (+ 1)
Surcharge d'une méthode héritée, à la {\bf{signature identique}}. L'accesor doit être aussi permissif. Impossible sur une méthode private évidemment...% Row Count 17 (+ 4)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
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\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{X}
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\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Enum example}}  \tn
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\mymulticolumn{1}{x{8.4cm}}{public enum Jour \{ \newline     LUNDI, MARDI, MERCREDI; \newline \} \newline public interface Descriptible \{ \newline     String getDescription(); \newline \} \newline public enum Jour implements Descriptible \{ \newline     LUNDI("Lun") \{ \newline         @Override \newline         public String getDescription() \{ \newline             return "1st day week"; \newline         \} \newline     \}, MARDI("Mar"), MERCREDI("Mer"); \newline     private final String abrev; // Champ \newline  \newline     // Constructeur (toujours private) \newline     Jour(String abrev) \{ \newline         this.abrev = abrev; \newline     \} \newline  \newline     // Méthode \newline     public String getAbrev() \{ \newline         return abrev; \newline     \} \newline \}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}


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

\end{document}