\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{tarinya}
\pdfinfo{
  /Title (oo-java.pdf)
  /Creator (Cheatography)
  /Author (tarinya)
  /Subject (OO\_Java Cheat Sheet)
}

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% 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
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% Font and Colours
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\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{OO\_Java Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{tarinya} via \textcolor{DarkBackground}{\uline{cheatography.com/25055/cs/6436/}}}
\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}tarinya \\
  \uline{cheatography.com/tarinya} \\
  \end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Published 8th January, 2016.\\
   Updated 10th May, 2016.\\
   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*}{3}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Typ Konversion}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{p{5.377cm}}{\vspace{1px}\centerline{\includegraphics[width=5.1cm]{/web/www.cheatography.com/public/uploads/tarinya_1450193804_Screen Shot 2015-12-15 at 16.35.51.png}}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{schwarze Pfeile: expliziet \newline rote Pfeile: impliziet, evt Genauigkeitsverlust \newline alles andere impliziet}  \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}{Switch-Statement}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{switch (Ausdruck) \{ \newline case Wert1: \newline    Anweisungen; \newline    break; \newline case Wert2: \newline    Anweisungen; \newline    break; \newline default: \newline    Anweisungen; \newline \}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Wenn Ausdruck Wert1 entspricht, wird Anweisung 1 ausgeführt...}  \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}{Typ Polymorphismus}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{car extends vehicle \newline @Override \newline drive()\{\} \newline Vehicle v = new Car(); \newline //calls drive of Car not Vehicle \newline v.drive();} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Klasse hat eigenen Typ plus alle Typen der Superklassen. \newline verschiedene "Brillen" \newline Dynamic Dispatch = dynamischer Typ zur Laufzeit entscheidet über aufgerufene Methoden.}  \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}{Rekursion}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{public boolean groupSum(int start, int{[}{]} nums, int target) \{ \newline   if (start \textgreater{}= nums.length) return (target == 0); \newline   if (groupSum(start + 1, nums, target - nums{[}start{]})) return true; \newline   if (groupSum(start + 1, nums, target)) return true; \newline   return false;\} \newline  \newline Collection\textless{}String\textgreater{} validParentheses(int nofPairs)\{ \newline   Collection\textless{}String\textgreater{} list = new ArrayList\textless{}\textgreater{}(); \newline   if (nofPairs == 0) \{list.add("");\} else \{ \newline     for (int k = 0; k \textless{} nofPairs; k++) \{ \newline       Collection\textless{}String\textgreater{} infixes = validParentheses(k); \newline       Collection\textless{}String\textgreater{} suffixes = \seqsplit{validParentheses(nofPairs} - k - 1); \newline       for (String infix : infixes) \{ \newline         for (String suffix : suffixes) \{ \newline           list.add("(" + infix + ")" + suffix);\}\}\}\} \newline   return list;\}} \tn 
\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}{Generics}}  \tn
% Row 0
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\mymulticolumn{1}{x{5.377cm}}{allg. Form} \tn 
% Row Count 1 (+ 1)
% Row 1
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\mymulticolumn{1}{x{5.377cm}}{class Pair\textless{}T,U\textgreater{}} \tn 
% Row Count 2 (+ 1)
% Row 2
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% Row Count 3 (+ 1)
% Row 3
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\mymulticolumn{1}{x{5.377cm}}{class Node\textless{}T extends Comparable\textless{}T\textgreater{}\textgreater{}\{\{nl\}\}Node\textless{}Person\textgreater{}//ok Node\textless{}Student\textgreater{}//Error} \tn 
% Row Count 5 (+ 2)
% Row 4
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\mymulticolumn{1}{x{5.377cm}}{Multiple TypeBounds (mit \& anh{\"a}ngen)} \tn 
% Row Count 6 (+ 1)
% Row 5
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% Row Count 7 (+ 1)
% Row 6
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\mymulticolumn{1}{x{5.377cm}}{generische Methode} \tn 
% Row Count 8 (+ 1)
% Row 7
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% Row Count 11 (+ 3)
% Row 8
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\mymulticolumn{1}{x{5.377cm}}{Wildcard-Typ (Nutzen: Typ{\bf{argument}} nicht relevant)} \tn 
% Row Count 13 (+ 2)
% Row 9
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\mymulticolumn{1}{x{5.377cm}}{Node\textless{}?\textgreater{} undef -{}-\textgreater{} kein Lesen \& schreiben ausser: Object o = undef.getValue();} \tn 
% Row Count 15 (+ 2)
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\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Lambdas}}  \tn
% Row 0
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\mymulticolumn{1}{x{5.377cm}}{`(p1, p2) -\textgreater{} p1.getAge() – p2.getAge()`} \tn 
% Row Count 1 (+ 1)
% Row 1
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\mymulticolumn{1}{x{5.377cm}}{`p -\textgreater{} p.getAge() \textgreater{}= 18`} \tn 
% Row Count 2 (+ 1)
% Row 2
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% Row Count 4 (+ 2)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{\seqsplit{`people.sort(Comparator.comparing(Person::getLastName).thenComparing(Person::getFirstName));`}} \tn 
% Row Count 6 (+ 2)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{`Utils.removeAll(people, person -\textgreater{} person.getAge() \textless{} 18);`} \tn 
% Row Count 8 (+ 2)
% Row 5
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{\seqsplit{`people.sort(Comparator.comparing(p1} -\textgreater{} \seqsplit{p1.getLastName().length()));`}} \tn 
% Row Count 10 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Syntax: (Parameter) -\textgreater{} \{Body\}}  \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}{StreamAPI}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{people \newline .stream() \newline .filter(p -\textgreater{} p.getAge() \textgreater{}= 18) \newline .map(p -\textgreater{} p.getLastName()) \newline .sorted() \newline .forEach(System.out::println); \newline  \newline people.stream().mapToInt(p -\textgreater{} p.getAge()) \newline .average().ifPresent(System.out::println); \newline  \newline Map\textless{}String, Integer\textgreater{} totalAgeByCity = \newline   people.stream() \newline   .collect( \newline      \seqsplit{Collectors.groupingBy(Person::getCity}, \newline      \seqsplit{Collectors.summingInt(Person::getAge)));}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{endliche Quelle:  `IntStream.range(1, 100)`\{\{nl\}\}unendl. Quelle:  `Random random = new Random(); \seqsplit{Stream.generate(random::nextInt).limit(100)`}}  \tn 
\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}{FileReader/Writer}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{private static void reverteText() throws FileNotFoundException, IOException\{ \newline   try (FileReader reader = new FileReader("input.txt"); \newline      FileWriter writer = new FileWriter("outpur.txt"))\{ \newline       int value = reader.read(); \newline       String text = ""; \newline       while (value \textgreater{}=0)\{ \newline          text = (char)value + text; \newline          value = reader.read();\} \newline       writer.write(text);\}\}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
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\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{1.39356 cm} x{3.58344 cm} }
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% Row 0
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public & alle Klassen \tn 
% Row Count 1 (+ 1)
% Row 1
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protected & Package und Sub-Klassen \tn 
% Row Count 2 (+ 1)
% Row 2
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private & nur innerhalb Klasse \tn 
% Row Count 3 (+ 1)
% Row 3
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(keines) & innerhalb Package \tn 
% Row Count 4 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
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\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{p{0.9954 cm} x{3.9816 cm} }
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% Row 0
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% Row Count 1 (+ 1)
% Row 1
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short & 16 bit \tn 
% Row Count 2 (+ 1)
% Row 2
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int & 32 bit \tn 
% Row Count 3 (+ 1)
% Row 3
\SetRowColor{white}
long & 64 bit (1L) \tn 
% Row Count 4 (+ 1)
% Row 4
\SetRowColor{LightBackground}
float & 32 bit (0.1f) \tn 
% Row Count 5 (+ 1)
% Row 5
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double & 64 bit \tn 
% Row Count 6 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
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\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
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% Row 0
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% Row Count 1 (+ 1)
% Row 1
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% Row Count 2 (+ 1)
% Row 2
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% Row Count 3 (+ 1)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{\textless{}, \textless{}=, \textgreater{}, \textgreater{}=} \tn 
% Row Count 4 (+ 1)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{==, !=} \tn 
% Row Count 5 (+ 1)
% Row 5
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% Row Count 6 (+ 1)
% Row 6
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\mymulticolumn{1}{x{5.377cm}}{||} \tn 
% Row Count 7 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
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\par\addvspace{1.3em}

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% Row 0
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\mymulticolumn{2}{x{5.377cm}}{0.1+0.1+0.1 != 0.3} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
Problem: double/float & `x == y` \tn 
% Row Count 3 (+ 2)
% Row 2
\SetRowColor{LightBackground}
L{\"o}sung & `Math.abs(x – y) \textless{} 1e-6` \tn 
% Row Count 5 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
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\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{p{1.64241 cm} x{3.33459 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Integer Literal}}  \tn
% Row 0
\SetRowColor{LightBackground}
bin{\"a}r & 0b10 = 2 \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
oktal & 010 = 8 \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
hex & 0x10 = 16 \tn 
% Row Count 3 (+ 1)
% Row 3
\SetRowColor{white}
opt. & 1000 = 1\_000 \tn 
% Row Count 4 (+ 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}{Arithmetik}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{1 / 0 -{}-\textgreater{} ArithmeticException: / by zero \newline 1 / 0.0 -{}-\textgreater{} Infinity \newline -1.0 / 0 -{}-\textgreater{} -Infinity \newline 0 / 0.0 -{}-\textgreater{} NaN} \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}{Arithmetik Overloading}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{int operate(int x, int y) \{ ... \} \newline double operate(int x, double y) \{ ... \} \newline double operate(double x, double y) \{ ... \}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{operate(1, 2); -{}-\textgreater{} meth 1 \newline operate(1.0, 2); -{}-\textgreater{} meth 3 \newline operate(1, 2.0); -{}-\textgreater{} meth 2}  \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}{Overloading}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{p{5.377cm}}{\vspace{1px}\centerline{\includegraphics[width=5.1cm]{/web/www.cheatography.com/public/uploads/tarinya_1452702762_Screen Shot 2016-01-13 at 17.32.23.png}}} \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}{Bedingungsoperator}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{max = left \textgreater{} right ? left : right;} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{wenn left\textgreater{}right wird max = left, sonst max=right}  \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}{Package prio}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{own class (inc. nested class)} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{single type imports -\textgreater{} import p2.A;} \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{class in same package} \tn 
% Row Count 3 (+ 1)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{import on demand -\textgreater{} import p2.*} \tn 
% Row Count 4 (+ 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}{Enum}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{public enum Color \{ \newline    BLUE(1), RED(2); \newline    private final int code; \newline    private Color(int code) \{ \newline       this.code = code;\} \newline    public int getColorValue() \{ \newline       return code;\}\}} \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}{Methodenreferenz}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{`people.sort(this::compareByAge)`\{\{nl\}\}`int compareByAge(Person p1, Person p2)\{return p1.age - p2.age;`\}} \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{`people.sort(Sorter::compareByAge)`\{\{nl\}\}`{\bf{static}} int compareByAge(Person p1, Person p2)\{return p1.age - p2.age;`\}} \tn 
% Row Count 6 (+ 3)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{`Sorter sorter = new Sorter();\{\{nl\}\}people.sort(sorter::compareByAge);`} \tn 
% Row Count 8 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Serialisieren}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{OuputStream fos = new \seqsplit{FileOutputStream("serial.bin");} \newline try (ObjectOutputStream stream = new ObjectOutputStream(fos))\{ \newline    \seqsplit{stream.writeObject(person);} \newline \}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{needs Serializable interface \newline serialisiert alle direkt \& inderekt referenz. Obj}  \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}{Input/Output}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{try (BufferedInputStream inputBuffer = new {\emph{bis}}(new \seqsplit{FileInputStream(pathSource));} \newline BufferedOutputStream outputB = new {\emph{bos}}(new \seqsplit{FileOutputStream(pathTarget)))} \{ \newline    byte{[}{]} byteBuffer = new byte{[}4096{]}; \newline    int value = \seqsplit{inputBuffer.read(byteBuffer);} \newline    while (value \textgreater{}= 0) \{ \newline       outputB.write(byteBuffer, 0, value); \newline       value = inputBuffer.read(byteBuffer);\}\} \newline catch (FileNotFoundException e) \{ \newline    System.out.println("File not found: "+e); \newline \} catch (IOException e) \{ \newline    \seqsplit{System.out.println("reading} Error:"+e);\}} \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}{String Pooling}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{String a = "OO", b = "Prog", c = "OOProg"; \newline //true \newline a == "OO"; c == "OO" + "Prog"; (a+b).equals(c); \newline //false \newline a + b == c;} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{String Literals gepoolt. True F{\"a}lle -{}-\textgreater{} es werden keine neuen Objekte erstellt \newline Integer-Pooling -128 bis 127}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{2.28942 cm} x{2.68758 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Collections}}  \tn
% Row 0
\SetRowColor{LightBackground}
Array & `int{[}{]} intArray = new int{[}3{]};` \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
List & `List\textless{}T\textgreater{} al = new ArrayList\textless{}\textgreater{}();` \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
Set & `Set\textless{}T\textgreater{} hs = new HashSet\textless{}\textgreater{}();` \tn 
% Row Count 6 (+ 2)
% Row 3
\SetRowColor{white}
Map & `Map\textless{}U,T\textgreater{} hm = new HashMap\textless{}\textgreater{}();` \tn 
% Row Count 8 (+ 2)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{`Iterator\textless{}T\textgreater{} it = a.iterator(); while(it.hasNext()) \{..\}`} \tn 
% Row Count 10 (+ 2)
% Row 5
\SetRowColor{white}
\seqsplit{`Collections.sort(Object} o)` & needs Comparable on o \tn 
% Row Count 12 (+ 2)
% Row 6
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{`for (Map.Entry\textless{}Character, Double\textgreater{} entry: map.entrySet())`} \tn 
% Row Count 14 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{LIST/SET: add(), remove() \newline LIST: get(index) \newline MAP: put(key, value), remove(key),getKey()}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{p{0.54924 cm} x{2.19696 cm} x{1.8308 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{3}{x{5.377cm}}{\bf\textcolor{white}{Interface vs. Abstract Class}}  \tn
% Row 0
\SetRowColor{LightBackground}
\seqsplit{Methoden} & implizit public, abstract & evt abstract, nie private \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
\seqsplit{Variablen} & KONSTANTEN (impl. public static final) & normal, Constructor mit super() \tn 
% Row Count 5 (+ 3)
% Row 2
\SetRowColor{LightBackground}
\seqsplit{Vererbung} & `implements a,b` & `extends a` \tn 
% Row Count 8 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}---}
\SetRowColor{LightBackground}
\mymulticolumn{3}{x{5.377cm}}{Abstract Method (in abs. cl.): \newline `public abstract void report();` kein Rumpf\{\} \newline in interface: `void report();` \newline I. Methode mit Rumpf: `default void report()\{...\}` \newline `interface I1 extends I2,I3` \newline `class C2 extends C1 implements I1, I2` \newline wenn I1\&I2 nun gleiche Methoden haben (signatur) -{}-\textgreater{} C2 muss ine der beiden überschreiben. Zugriff m{\"o}glich mit \{\{nl\}\}`I1.super.{\emph{methode}}(); I2.super.{\emph{methode}}();`}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}---}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{1.89126 cm} x{3.08574 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Unchecked vs Checked Exceptions}}  \tn
% Row 0
\SetRowColor{LightBackground}
{\bf{Unchecked}} & {\bf{Checked}} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
Error & Try/catch oder Methodenkopf \tn 
% Row Count 3 (+ 2)
% Row 2
\SetRowColor{LightBackground}
RunTime-\{\{nl\}\}Exceptions & m{\"o}gl. catch-Block:\{\{nl\}\}`e.printStackTrace()` \tn 
% Row Count 5 (+ 2)
% Row 3
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{-\textgreater{} RunTime, NullPointer, IllegalArgument, IndexOutOfBounds} \tn 
% Row Count 7 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{eigene exception \newline `class myE extends Exception \{ myE() \{\}` \newline `MyE(String message) \{` \newline `super(message);\} \}`}  \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}{Junit}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{@Before \newline public void setUp() \{...\} \newline @Test (timeout = 500, expected = Exception.class) \newline public void testGoodName()\{ \newline   assertEquals(expected, actual); \newline   assertTrue(condition);\}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{@After -\textgreater{} tearDown() \newline EdgeCases testen (Grenzwerte, null,...)}  \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}{equals}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{@Override \newline public boolean equals(Object obj) \{ \newline    if(this == obj) \{return true;\} \newline    if (obj == null) \{return false;\} \newline    if (getClass() != obj.getClass()) \{ \newline       return false;\} \newline    Student other = (Student)obj; \newline    return regNumber == other.regNumber;\}\}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{HashCode überschreiben! \newline ` x.equals(y) → x.hashCode() == y.hashCode() \newline Grund: inkonsistenz bei Hashing. obj wird nicht gefunden, obwohl in Hash-Tabelle, x.contains(y) -{}-\textgreater{} nutzt hashCode()  \& equals()}  \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}{HashCode()}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{@Override \newline public int hashCode() \{ \newline   return 31{\emph{ firstName.hashCode() \newline    + 31 }} lastName.hashCode(); \newline \}} \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}{Funktionsschnittstelle}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{@FunctionalInterface \newline interface Comparator\textless{}T\textgreater{} \{ \newline   int compare(T first, T second); \newline \}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{genau eine Methode -{}-\textgreater{} java.util.function}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{2.78712 cm} x{2.18988 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{RegEx}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{Pattern pattern = Pattern.compile("{\emph{reg}}")} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
vor ? optionaler Teil & ({[}0{]}?{[}0-9{]}|2{[}0-3{]}) \tn 
% Row Count 3 (+ 2)
% Row 2
\SetRowColor{LightBackground}
()\{\}*+?|\textbackslash{} als norm text & *    \textbackslash{}(    \textbackslash{}\textbackslash{} ... \tn 
% Row Count 5 (+ 2)
% Row 3
\SetRowColor{white}
Gruppennamen & (?\textless{}NAME\textgreater{}) \tn 
% Row Count 6 (+ 1)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{Matcher matcher = pattern.matcher(string);\{\{nl\}\}if (matcher.matches())\{String one = matcher.group("NAME")\}} \tn 
% Row Count 9 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}


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

\end{document}