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% Packages
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%\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{Jianmin Feng (taotao)}
\pdfinfo{
  /Title (operator-an-statement.pdf)
  /Creator (Cheatography)
  /Author (Jianmin Feng (taotao))
  /Subject (Operator an statement Cheat Sheet)
}

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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{Operator an statement Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{Jianmin Feng (taotao)} via \textcolor{DarkBackground}{\uline{cheatography.com/79308/cs/19373/}}}
\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}Jianmin Feng (taotao) \\
  \uline{cheatography.com/taotao} \\
  \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 8th May, 2019.\\
   Page {\thepage} of \pageref{LastPage}.
\end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
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  \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{1.69218 cm} x{3.28482 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Operators}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{{[}{]} ()} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
x++ x-{}- & post unary \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
++x -{}-x & pre unary \tn 
% Row Count 3 (+ 1)
% Row 3
\SetRowColor{white}
\textasciitilde{} + - ! & ! only for logic \tn 
% Row Count 4 (+ 1)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{* / \%} \tn 
% Row Count 5 (+ 1)
% Row 5
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{+ -} \tn 
% Row Count 6 (+ 1)
% Row 6
\SetRowColor{LightBackground}
\textless{}\textless{}\textgreater{}\textgreater{}\textgreater{}\textgreater{}\textgreater{} & shift \tn 
% Row Count 7 (+ 1)
% Row 7
\SetRowColor{white}
\textless{}\textgreater{} \textless{}= \textgreater{}= instanceof & compare \tn 
% Row Count 9 (+ 2)
% Row 8
\SetRowColor{LightBackground}
== != & for primitives, obj type compare addr \tn 
% Row Count 11 (+ 2)
% Row 9
\SetRowColor{white}
\&- \textasciicircum{} -\textgreater{}| & logic \tn 
% Row Count 12 (+ 1)
% Row 10
\SetRowColor{LightBackground}
\&\& -\textgreater{} || & shortcut logic \tn 
% Row Count 13 (+ 1)
% Row 11
\SetRowColor{white}
(boolean)?x :y & tenary (can be nested) \tn 
% Row Count 15 (+ 2)
% Row 12
\SetRowColor{LightBackground}
= & assignment \tn 
% Row Count 16 (+ 1)
% Row 13
\SetRowColor{white}
+= -=... & compound assignment, auto casting \tn 
% Row Count 18 (+ 2)
% Row 14
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{casting (type)} \tn 
% Row Count 19 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{== and !=  are logic;  = is assignment \newline . operator precedent of casting, so be careful with (B a).m() vs (B)a.m()}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{1.9908 cm} x{2.9862 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Numberic promotion}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{promote the larger operand type} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{byte,short,char -\textgreater{}int-\textgreater{}float-\textgreater{}double} \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{assign result to promoted type} \tn 
% Row Count 3 (+ 1)
% Row 3
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{1)unary exclusive short ++ -\textgreater{} still short} \tn 
% Row Count 4 (+ 1)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{2) by default literal is int or double} \tn 
% Row Count 5 (+ 1)
% Row 5
\SetRowColor{white}
float f=1; & ok,1 is a definite number \tn 
% Row Count 7 (+ 2)
% Row 6
\SetRowColor{LightBackground}
float f=0.1; & X 0.1 is not definite number \tn 
% Row Count 9 (+ 2)
% Row 7
\SetRowColor{white}
long l=power(2,32) & X \seqsplit{Integer.MAX\_VALUE=power(2},32)-1 \tn 
% Row Count 11 (+ 2)
% Row 8
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{} \tn 
% Row Count 11 (+ 0)
% Row 9
\SetRowColor{white}
short a=2,b=3,z;z=a*b; & a*b -\textgreater{} int \tn 
% Row Count 13 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
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\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{1.64241 cm} x{3.33459 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{x++ and ++x}}  \tn
% Row 0
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\mymulticolumn{2}{x{5.377cm}}{int x=3,y;} \tn 
% Row Count 1 (+ 1)
% Row 1
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y=x++; & assign x to y(1), then increment x(2) \tn 
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% Row 2
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y=++x; & increment x(2), then assign x to y(2) \tn 
% Row Count 5 (+ 2)
% Row 3
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y=++x*5/x-{}- + -{}-x; & x=2,y=7 \tn 
% Row Count 7 (+ 2)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{No effect in stand for loop} \tn 
% Row Count 8 (+ 1)
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\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Using enum}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{1. dot notation, Days.FRIDAY \newline 2. name(), toString() -\textgreater{}capital label \newline 3. ordinal()  -\textgreater{} index from 0 \newline 4. valueOf(String) -\textgreater{}parse string to enum \newline 5. compare: == or equals() \newline 6.switch (enum\_var) \{ \newline    case enum\_value: \newline    .. \newline   default: \newline    .... \newline  \}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
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\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{2.9862 cm} x{1.9908 cm} }
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\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{enum}}  \tn
% Row 0
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\mymulticolumn{2}{x{5.377cm}}{Why enum?} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
more readable constant declaration & allow compiler time check \tn 
% Row Count 3 (+ 2)
% Row 2
\SetRowColor{LightBackground}
avoid unexpected behavior & document upfront \tn 
% Row Count 5 (+ 2)
% Row 3
\SetRowColor{white}
What's enum & start from java5 \tn 
% Row Count 6 (+ 1)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{extends java.lang.enum} \tn 
% Row Count 7 (+ 1)
% Row 5
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{enum constant internally implemented as public static final variables} \tn 
% Row Count 9 (+ 2)
% Row 6
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{overriden equals(), toString, hasCode()} \tn 
% Row Count 10 (+ 1)
% Row 7
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{may define variable,constructor, methods just like in a class} \tn 
% Row Count 12 (+ 2)
% Row 8
\SetRowColor{LightBackground}
name(),toString() return string value & ordinal() return index \tn 
% Row Count 14 (+ 2)
% Row 9
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{could has constuctor and methods, just like a class} \tn 
% Row Count 16 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{2.68758 cm} x{2.28942 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Assignments}}  \tn
% Row 0
\SetRowColor{LightBackground}
assignment overflow ( too high to hold) & int i=1.0;byte b=128;float f=0.1; \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{explicit cast required when overflow} \tn 
% Row Count 3 (+ 1)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{underflow (float number too small to represent)} \tn 
% Row Count 4 (+ 1)
% Row 3
\SetRowColor{white}
Compound assignment & auto cast back to left operand \tn 
% Row Count 6 (+ 2)
% Row 4
\SetRowColor{LightBackground}
assignment chaining allowed & int i,j,k; i=j=k=9; \tn 
% Row Count 8 (+ 2)
% Row 5
\SetRowColor{white}
if (a=9) \{\} //exception & if (a=true)\{\} //ok \tn 
% Row Count 10 (+ 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}{enum example}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{public enum Days \{ \newline   SUNDAY, MONDAY, TUESDAY, WEDNESDAY,  \newline   THURSDAY, FRIDAY, SATURDAY; \newline \} \newline  \newline // syntax like class, but with enum keyword \newline // name=capital label;ordinal=index value from 0 \newline // could have \seqsplit{fields/constructor/methods} inside \newline // extends java.lang.enum \newline // implemented internally as class,  \newline // enum value are public static final object constant \newline  \newline public enum MusicType\{ \newline   CLASSIC(1),JAZZ(4),ROCK(6),METAL(11); \newline   private int earDamageFacor; \newline    \newline   private MusicType(int earDamageFactor) \newline  \{  this \seqsplit{earDamageFactor=earDamageFactor;} \} \newline   \newline   public int calcHearingLoss(int huors) \newline   \{  return huors*earDamageFactor;\} \newline  \newline   public String toString () \newline   \{  return \seqsplit{this.name()+"-"+this.ordinal()+'\_"} \newline      + this.earDamageFactor; \newline   \}    \newline \}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{2.09034 cm} x{2.88666 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Java Statement}}  \tn
% Row 0
\SetRowColor{LightBackground}
if ({\bf{boolean}}) \{\} & multiple statement need \{\} \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
else if (...) \{\} & one statement may miss \{\} \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{else \{\}} \tn 
% Row Count 5 (+ 1)
% Row 3
\SetRowColor{white}
( ...) ? x :y & x,y: same data type \tn 
% Row Count 6 (+ 1)
% Row 4
\SetRowColor{LightBackground}
... ? ...?x :y:z & nested \tn 
% Row Count 7 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{if (x=5) \{\} //won't compile}  \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}{Switch}}  \tn
% Row 0
\SetRowColor{LightBackground}
switch \seqsplit{(literal-value)} \{ & Byte,byte,Short,short,Integer,int \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
case 1: ....;break; & Character,char,enum,String \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
case 2: ....;break; & 8 types, after case is literal \tn 
% Row Count 6 (+ 2)
% Row 3
\SetRowColor{white}
case 0: ....;break; & default: position not matters \tn 
% Row Count 8 (+ 2)
% Row 4
\SetRowColor{LightBackground}
default: & breaks; avoid follow through, need in every case, exclude last on \tn 
% Row Count 11 (+ 3)
% Row 5
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{\}} \tn 
% Row Count 12 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{the case value must be compiling time literal}  \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}{While}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{while (...) \{ .. increate conunter ...\}} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
do \{....\} wjile (....) & execute \textgreater{}=1 times \tn 
% Row Count 3 (+ 2)
% Row 2
\SetRowColor{LightBackground}
infinity loop & while (true) \{\} \tn 
% Row Count 4 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{3.38436 cm} x{1.59264 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{for loop}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{{\bf{for ( int i;i\textless{}arr.length-1;i++)}}} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{standard for loop: (4 steps init -\textgreater{}eval -\textgreater{}body exec -\textgreater{}increament, ++i,i++ no different)} \tn 
% Row Count 3 (+ 2)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{multiple declaration initializer allowed, separated by ',', should be same type} \tn 
% Row Count 5 (+ 2)
% Row 3
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{initializer scope: inside for loop} \tn 
% Row Count 6 (+ 1)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{{\bf{for ( Class instance:collection)\{\}}}} \tn 
% Row Count 7 (+ 1)
% Row 5
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{for each: iterate only, unable to access i} \tn 
% Row Count 8 (+ 1)
% Row 6
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{java.iterable \textless{}-java.lamg.collection} \tn 
% Row Count 9 (+ 1)
% Row 7
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{Array, ArrayList, List} \tn 
% Row Count 10 (+ 1)
% Row 8
\SetRowColor{LightBackground}
{\bf{for(;;)\{\}}} & infinite loop \tn 
% Row Count 12 (+ 2)
% Row 9
\SetRowColor{white}
for( int i=0;i\textless{}10;) \{i=i++;\} & infinite loop \tn 
% Row Count 14 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{for ( int value, values) \{\} -\textgreater{} for ( \seqsplit{java.uitl.iterator(Integer)} i=value.iterator(); i.hasNext())\{\}}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{2.18988 cm} x{2.78712 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Advance Flow Control}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{{\bf{Nested loops}}} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{{\bf{Optional label}}} \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
OUTER\_LOOP:.... INNER\_LOOP & all flow control allowed, but bad practice \tn 
% Row Count 4 (+ 2)
% Row 3
\SetRowColor{white}
{\bf{breaks}} optional\_label; & not for if..then..else \tn 
% Row Count 6 (+ 2)
% Row 4
\SetRowColor{LightBackground}
breakout current block & breakout current block and go to optional label \tn 
% Row Count 9 (+ 3)
% Row 5
\SetRowColor{white}
{\bf{Continue}} optional\_label; & not for if..then..else and switch \tn 
% Row Count 11 (+ 2)
% Row 6
\SetRowColor{LightBackground}
stop and Continue next iteration & stop and go to optional label \tn 
% Row Count 13 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{p{0.4977 cm} p{0.4977 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Scope}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{if, while,for loop define local scope} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{vaiable declared inside control block could not used out of \{\}} \tn 
% Row Count 3 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}


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

\end{document}