\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{fzz}
\pdfinfo{
  /Title (comp1110-sijsodijsdg.pdf)
  /Creator (Cheatography)
  /Author (fzz)
  /Subject (COMP1110 SIJSODIJSDG Cheat Sheet)
}

% Lengths and widths
\addtolength{\textwidth}{6cm}
\addtolength{\textheight}{-1cm}
\addtolength{\hoffset}{-3cm}
\addtolength{\voffset}{-2cm}
\setlength{\tabcolsep}{0.2cm} % Space between columns
\setlength{\headsep}{-12pt} % Reduce space between header and content
\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
\definecolor{HeadBackground}{HTML}{333333}
\definecolor{FootBackground}{HTML}{666666}
\definecolor{TextColor}{HTML}{333333}
\definecolor{DarkBackground}{HTML}{02B899}
\definecolor{LightBackground}{HTML}{EFFAF8}
\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{COMP1110 SIJSODIJSDG Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{fzz} via \textcolor{DarkBackground}{\uline{cheatography.com/186806/cs/39076/}}}
\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}fzz \\
  \uline{cheatography.com/fzz} \\
  \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 5th June, 2023.\\
   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}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Threads and concurrency}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{- Change the class name to 'implements runnable' - Implement the method for parallelising (e.g. isPrime) - Implement sync method. For any code executed in sync method, threads are paused until the last call is complete.  	- Implement the actual parallelising in @override run - Use a while loop to execute:  	while((n=getNextInteger())\textless{}N\_INTS)\{ 	results{[}n{]}=isPrime(n); \}} \tn 
% Row Count 8 (+ 8)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{3.52 cm} x{4.48 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Arrays and arraylists}}  \tn
% Row 0
\SetRowColor{LightBackground}
Array to Arraylist & \seqsplit{Arrays.stream(row\_array).boxed().collect(Collectors.toList());} \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
ArrayList to Array (Int to int) & int{[}{]} new = old.stream().mapToInt(i-\textgreater{}i).toArray(); \tn 
% Row Count 6 (+ 3)
% Row 2
\SetRowColor{LightBackground}
Get Max & \seqsplit{cats.values().stream()}.mapToInt(x-\textgreater{}x).max().getAsInt() \tn 
% Row Count 9 (+ 3)
% Row 3
\SetRowColor{white}
Copy array values & var included= Arrays.copyOfRange(in,0,endIndex);  OR  USE FORLOOP. \tn 
% Row Count 12 (+ 3)
% Row 4
\SetRowColor{LightBackground}
Reverse list & \seqsplit{Collections.reverse(names);} \tn 
% Row Count 14 (+ 2)
% Row 5
\SetRowColor{white}
Convert integer to int & int x.intValue() \tn 
% Row Count 16 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{4 cm} x{4 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Classes}}  \tn
% Row 0
\SetRowColor{LightBackground}
\seqsplit{NoClassDefFoundError} & Make sure when you create the class, it's in the right folder \tn 
% Row Count 4 (+ 4)
% Row 1
\SetRowColor{white}
Initialise non-static inner class from psvm & Switch the 'new' position: \{\{nl\}\} Cost cost=new Cost(); Cost.Item \{\{nl\}\}  item1=cost.new Item("",50); \tn 
% Row Count 10 (+ 6)
% Row 2
\SetRowColor{LightBackground}
Compare class of objects & Compare classes animals{[}x{]}{[}y{]}.getClass().equals(World.Fox.class) \tn 
% Row Count 14 (+ 4)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{2.96 cm} x{5.04 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Misc imperative programming}}  \tn
% Row 0
\SetRowColor{LightBackground}
Case switch syntax & return switch(group)\{\{\{nl\}\}	             case LEGUME -\textgreater{} Group.BRASSICA;\{\{nl\}\}	default -\textgreater{} null;         \}     \} \tn 
% Row Count 5 (+ 5)
% Row 1
\SetRowColor{white}
Deep copy & List.copyOf, Arrays.copyOf or Object.clone() \tn 
% Row Count 7 (+ 2)
% Row 2
\SetRowColor{LightBackground}
End loop of a scanner & while(sc.hasNextDouble())\{\} (ctrl+d to end) \tn 
% Row Count 9 (+ 2)
% Row 3
\SetRowColor{white}
Ifelse shortened & var last = used.isEmpty() ? null : used.get(used.size() - 1); \tn 
% Row Count 12 (+ 3)
% Row 4
\SetRowColor{LightBackground}
generate random numbers & var rand=newRandom(); \{\{nl\}\} var list=rand.ints(10,0,500); \tn 
% Row Count 15 (+ 3)
% Row 5
\SetRowColor{white}
try catch & try\{\} catch(Exception E)\{\} \tn 
% Row Count 17 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{2.32 cm} x{5.68 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Recursion}}  \tn
% Row 0
\SetRowColor{LightBackground}
Keep track of & full\_set, used, last, current, expected\_next \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
Ending recursion & if(used.size() == x) - \textgreater{} \seqsplit{all\_sets.add(List.copyOf(used));} return; \tn 
% Row Count 5 (+ 3)
% Row 2
\SetRowColor{LightBackground}
recursing & used.add(crop); getFixedRotation(crops,seasons,used,rotations); used.remove(crop); \tn 
% Row Count 8 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{3.04 cm} x{4.96 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Hashing and HashCodes}}  \tn
% Row 0
\SetRowColor{LightBackground}
Integer hash by division & \seqsplit{Integer.toUnsignedLong(value)} \% nBuckets; \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
Integer hash by division & Math.floor(nBuckets {\emph{ \seqsplit{((Integer.toUnsignedLong(value)} }} 1.618) \% 1)); \tn 
% Row Count 5 (+ 3)
% Row 2
\SetRowColor{LightBackground}
String hash & iterate over each char: \{\{nl\}\} for i, int hashchar = hashfn(value.atchar(i),buckets); \{\{nl\}\} hash = (hash + hash\_char) \% buckets; \tn 
% Row Count 11 (+ 6)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{2.48 cm} x{5.52 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Sets}}  \tn
% Row 0
\SetRowColor{LightBackground}
Add items to a set & Set\textless{}Food\textgreater{}foods=newHashSet\textless{}\textgreater{}()\{\}; \{\{nl\}\} \seqsplit{foods.addAll(List.of(cake},Vegetable\_Soup,Waffles,Potato\_Gratin)); \tn 
% Row Count 4 (+ 4)
% Row 1
\SetRowColor{white}
Sort a Set & 1. Create arraylist 2.add items of the set to the arraylist 3. use arraylist.sort method. \{\{nl\}\} ArrayList\textless{}Item\textgreater{}sorted\_items=newArrayList\textless{}Item\textgreater{}(); \{\{nl\}\} \seqsplit{sorted\_items.addAll(this.items.values());} sorted\_items.sort((a,b)-\textgreater{}a.compareTo(b)); \tn 
% Row Count 13 (+ 9)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{4 cm} x{4 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Generics}}  \tn
% Row 0
\SetRowColor{LightBackground}
class header & public class Q6DelayedRelease\textless{}T\textgreater{} \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
generic array & E{[}{]} arr = (E{[}{]})new Object{[}INITIAL\_ARRAY\_LENGTH{]}; \tn 
% Row Count 5 (+ 3)
% Row 2
\SetRowColor{LightBackground}
ClassCastExceptions (Add code AFTER declaration of T) & this.items = (Item{[}{]}) \seqsplit{Array.newInstance(new} Item(delay,value).getClass(), slots); \tn 
% Row Count 10 (+ 5)
% Row 3
\SetRowColor{white}
inner class T & try add \textless{}T\textgreater{} qualifier to inner and outer class \tn 
% Row Count 13 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}


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

\end{document}