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% Document Info
\author{jimisanchez}
\pdfinfo{
  /Title (seng-6250.pdf)
  /Creator (Cheatography)
  /Author (jimisanchez)
  /Subject (SENG 6250 Cheat Sheet)
}

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% Header and Footer
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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}}
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\end{tabulary}
\columnbreak
\begin{tabulary}{11cm}{L}
    \vspace{-2pt}\large{\bf{\textcolor{DarkBackground}{\textrm{SENG 6250 Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{jimisanchez} via \textcolor{DarkBackground}{\uline{cheatography.com/27671/cs/8075/}}}
\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}jimisanchez \\
  \uline{cheatography.com/jimisanchez} \\
  \end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Published 2nd May, 2016.\\
   Updated 8th 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}}  \\
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  \vspace{-5pt}
  %\includegraphics[width=48px,height=48px]{dave.jpeg}
  Measure your website readability!\\
  www.readability-score.com
\end{tabulary}
\end{multicols}}




\begin{document}
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\begin{multicols*}{4}

\begin{tabularx}{3.833cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{3.833cm}}{\bf\textcolor{white}{Generic count \# of elements in a collection}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{3.833cm}}{public final class Algorithm \{ \newline     public static \textless{}T\textgreater{} int countIf(Collection\textless{}T\textgreater{} c, UnaryPredicate\textless{}T\textgreater{} p) \{ \newline         int count = 0; \newline         for (T elem : c) \newline             if (p.test(elem)) \newline                 ++count; \newline         return count; \newline     \} \newline \} \newline public interface UnaryPredicate\textless{}T\textgreater{} \{ \newline     public boolean test(T obj); \newline \} \newline import java.util.*; \newline class OddPredicate implements UnaryPredicate\textless{}Integer\textgreater{} \{ \newline     public boolean test(Integer i) \{ return i \% 2 != 0; \} \newline \} \newline public class Test \{ \newline     public static void main(String{[}{]} args) \{ \newline         Collection\textless{}Integer\textgreater{} ci = Arrays.asList(1, 2, 3, 4); \newline         int count = Algorithm.countIf(ci, new OddPredicate()); \newline         \seqsplit{System.out.println("Number} of odd integers = " + count); \newline     \} \newline \}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{3.833cm}}{The program prints: \newline Number of odd integers = 2}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{3.833cm}}{\bf\textcolor{white}{compile? If not, why?}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{3.833cm}}{public class Singleton\textless{}T\textgreater{} \{ \newline     public static T getInstance() \{ \newline         if (instance == null) \newline             instance = new Singleton\textless{}T\textgreater{}(); \newline         return instance; \newline     \} \newline     private static T instance = null; \newline \}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{3.833cm}}{No. You cannot create a static field of the type parameter T.}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{3.833cm}}{\bf\textcolor{white}{Swap positions of two elements in array.}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{3.833cm}}{public final class Algorithm \{ \newline     public static \textless{}T\textgreater{} void swap(T{[}{]} a, int i, int j) \{ \newline         T temp = a{[}i{]}; \newline         a{[}i{]} = a{[}j{]}; \newline         a{[}j{]} = temp; \newline     \} \newline \}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{3.833cm}}{\bf\textcolor{white}{Method 2 find the maximal element of a list.}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{3.833cm}}{import java.util.*; \newline public final class Algorithm \{ \newline     public static \textless{}T extends Object \& Comparable\textless{}? super T\textgreater{}\textgreater{} \newline         T max(List\textless{}? extends T\textgreater{} list, int begin, int end) \{ \newline         T maxElem = list.get(begin); \newline         for (++begin; begin \textless{} end; ++begin) \newline             if \seqsplit{(maxElem.compareTo(list.get(begin))} \textless{} 0) \newline                 maxElem = list.get(begin); \newline         return maxElem; \newline     \} \newline \}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{3.833cm}}{\bf\textcolor{white}{How  invoke 2 find the first integer...}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{3.833cm}}{public static \textless{}T\textgreater{} \newline     int findFirst(List\textless{}T\textgreater{} list, int begin, int end, UnaryPredicate\textless{}T\textgreater{} p) \newline \_\_\_ \newline import java.util.*; \newline public final class Algorithm \{ \newline     public static \textless{}T\textgreater{} \newline         int findFirst(List\textless{}T\textgreater{} list, int begin, int end, UnaryPredicate\textless{}T\textgreater{} p) \{ \newline         for (; begin \textless{} end; ++begin) \newline             if \seqsplit{(p.test(list.get(begin)))} \newline                 return begin; \newline         return -1; \newline     \} \newline     // x \textgreater{} 0 and y \textgreater{} 0 \newline     public static int gcd(int x, int y) \{ \newline         for (int r; (r = x \% y) != 0; x = y, y = r) \{ \} \newline             return y; \newline     \} \newline \}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{3.833cm}}{\bf\textcolor{white}{Compiler erases parameters, y use generics?}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{3.833cm}}{The Java compiler enforces tighter type checks on generic code at compile time.} \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{3.833cm}}{Generics support programming types as parameters.} \tn 
% Row Count 3 (+ 1)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{3.833cm}}{Generics enable you to implement generic algorithms.} \tn 
% Row Count 5 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{3.833cm}}{\bf\textcolor{white}{Converted to after type erasure?}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{3.833cm}}{public class Pair \{ \newline     public Pair(Object key, Object value) \{ \newline         this.key = key; \newline         this.value = value; \newline     \} \newline     public Object getKey()   \{ return key; \} \newline     public Object getValue() \{ return value; \} \newline     public void setKey(Object key)     \{ this.key = key; \} \newline     public void setValue(Object value) \{ this.value = value; \} \newline     private Object key; \newline     private Object value; \newline \}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{3.833cm}}{\bf\textcolor{white}{converted to after type erasure?}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{3.833cm}}{public static \textless{}T extends Comparable\textless{}T\textgreater{}\textgreater{} \newline     int findFirstGreaterThan(T{[}{]} at, T elem) \{ \newline     // ... \newline \} \newline // becomes \newline public static int findFirstGreaterThan(Comparable{[}{]} at, Comparable elem) \{ \newline     // ... \newline     \}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{3.833cm}}{\bf\textcolor{white}{compile? If not, why?}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{3.833cm}}{public static void print(List\textless{}? extends Number\textgreater{} list) \{ \newline     for (Number n : list) \newline         System.out.print(n + " "); \newline     System.out.println(); \newline \}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{3.833cm}}{Yes}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{3.833cm}}{\bf\textcolor{white}{Will the following class compile? If not, why?}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{3.833cm}}{public final class Algorithm \{ \newline     public static \textless{}T\textgreater{} T max(T x, T y) \{ \newline         return x \textgreater{} y ? x : y; \newline     \} \newline \}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{3.833cm}}{No. The greater than (\textgreater{}) operator applies only to primitive numeric types.}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{3.833cm}}{\bf\textcolor{white}{Compile?}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{3.833cm}}{class Node\textless{}T\textgreater{} implements Comparable\textless{}T\textgreater{} \{ \newline     public int compareTo(T obj) \{ /{\emph{ ... }}/ \} \newline \}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{3.833cm}}{Yes.}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{3.833cm}}{\bf\textcolor{white}{Compile}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{3.833cm}}{class Shape \{ /{\emph{ ... }}/ \} \newline class Circle extends Shape \{ /{\emph{ ... }}/ \} \newline class Rectangle extends Shape \{ /{\emph{ ... }}/ \} \newline class Node\textless{}T\textgreater{} \{ /{\emph{ ... }}/ \} \newline Node\textless{}Circle\textgreater{} nc = new Node\textless{}\textgreater{}(); \newline Node\textless{}Shape\textgreater{}  ns = nc;} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{3.833cm}}{No. Because Node\textless{}Circle\textgreater{} is not a subtype of Node\textless{}Shape\textgreater{}.}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}


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

\end{document}