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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.
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\usepackage{MnSymbol}           % Symbols
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%\usepackage[english,german,french,spanish,italian]{babel}              % Languages

% Document Info
\author{Jianmin Feng (taotao)}
\pdfinfo{
  /Title (java-collections-oca.pdf)
  /Creator (Cheatography)
  /Author (Jianmin Feng (taotao))
  /Subject (Java Collections (OCA) 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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\columnbreak
\begin{tabulary}{11cm}{L}
    \vspace{-2pt}\large{\bf{\textcolor{DarkBackground}{\textrm{Java Collections (OCA) Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{Jianmin Feng (taotao)} via \textcolor{DarkBackground}{\uline{cheatography.com/79308/cs/19511/}}}
\end{tabulary}
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\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 1st 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}}  \\
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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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% www.emerson.emory.edu/services/latex/latex_169.html
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\begin{multicols*}{3}

\begin{tabularx}{5.377cm}{p{0.4977 cm} p{0.4977 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{What's collection}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{a framework/architecture(a set of classes /interface) to store and manipulation group(single unit)  of objcts} \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{sorting, searching, insert, delete, iterate etc.} \tn 
% Row Count 4 (+ 1)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{many interfaces: List, Set, Queue,Dequeue} \tn 
% Row Count 5 (+ 1)
% Row 3
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{many classes: ArrayList,Vector, LinkedList,PriorityQueue,HashSet,TreeSet etc} \tn 
% Row Count 7 (+ 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}{Collection framework hierarchy}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{iterable -{}-\textgreater{} collection -{}-\textgreater{}List,Queue/Deque,Set/SortedSet} \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{list-\textgreater{}ArrayList,LinkedList,Vector \textless{}-Sack} \tn 
% Row Count 3 (+ 1)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{Queue -\textgreater{}PriorityQueue} \tn 
% Row Count 4 (+ 1)
% Row 3
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{Deque -\textgreater{}ArrayDeque,LinkedList} \tn 
% Row Count 5 (+ 1)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{SortedSet-\textgreater{}TreeSet} \tn 
% Row Count 6 (+ 1)
% Row 5
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{Set-\textgreater{}HashSet,LinkedHashSet} \tn 
% Row Count 7 (+ 1)
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\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{3.68298 cm} x{1.29402 cm} }
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\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Collection Methods}}  \tn
% Row 0
\SetRowColor{LightBackground}
public boolean add(E e) & append an item \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
public boolean addAll(Collection\textless{}? extends E\textgreater{} c) & addAll \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
public boolean remove(Object element) & remove 1 \tn 
% Row Count 6 (+ 2)
% Row 3
\SetRowColor{white}
public boolean removeAll(Collection\textless{}?\textgreater{} c) & removeAll \tn 
% Row Count 8 (+ 2)
% Row 4
\SetRowColor{LightBackground}
default boolean removeIf(Predicate\textless{}? super E\textgreater{} filter) & removeIf \tn 
% Row Count 10 (+ 2)
% Row 5
\SetRowColor{white}
public boolean retainAll(Collection\textless{}?\textgreater{} c) & retainAll \tn 
% Row Count 12 (+ 2)
% Row 6
\SetRowColor{LightBackground}
public int size() & size() \tn 
% Row Count 13 (+ 1)
% Row 7
\SetRowColor{white}
public void clear() & clear \tn 
% Row Count 14 (+ 1)
% Row 8
\SetRowColor{LightBackground}
public boolean isEmpty() & isEmpty \tn 
% Row Count 15 (+ 1)
% Row 9
\SetRowColor{white}
public boolean contains(Object element) & contains \tn 
% Row Count 17 (+ 2)
% Row 10
\SetRowColor{LightBackground}
public boolean containsAll(Collection\textless{}?\textgreater{} c) & \seqsplit{containsAll} \tn 
% Row Count 19 (+ 2)
% Row 11
\SetRowColor{white}
public Iterator iterator() & iterator \tn 
% Row Count 20 (+ 1)
% Row 12
\SetRowColor{LightBackground}
public Object{[}{]} toArray() & toArray \tn 
% Row Count 21 (+ 1)
% Row 13
\SetRowColor{white}
public \textless{}T\textgreater{} T{[}{]}	toArray(T{[}{]} a) & toArray type \tn 
% Row Count 23 (+ 2)
% Row 14
\SetRowColor{LightBackground}
public boolean equals(Object element) & equals \tn 
% Row Count 25 (+ 2)
% Row 15
\SetRowColor{white}
public int hashCode() & hashcode \tn 
% Row Count 26 (+ 1)
% Row 16
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% Row 17
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\mymulticolumn{2}{x{5.377cm}}{default Stream\textless{}E\textgreater{} stream()} \tn 
% Row Count 28 (+ 1)
% Row 18
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\mymulticolumn{2}{x{5.377cm}}{default Spliterator\textless{}E\textgreater{} spliterator()} \tn 
% Row Count 29 (+ 1)
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\begin{tabularx}{5.377cm}{p{0.4977 cm} p{0.4977 cm} }
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% Row 0
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% Row Count 1 (+ 1)
% Row 1
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% Row Count 3 (+ 1)
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\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{enumeration hasMoreElement(), nextElement(), but no remove()}  \tn 
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\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}{Iterable interface}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{top of collection} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{Only one method:} \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
Iterator\textless{}T\textgreater{} iterator() & return the iterator over the items of type T \tn 
% Row Count 4 (+ 2)
% Row 3
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{{\bf{4 way to iterate}}} \tn 
% Row Count 5 (+ 1)
% Row 4
\SetRowColor{LightBackground}
1. iterator & hasNext(), next() \tn 
% Row Count 6 (+ 1)
% Row 5
\SetRowColor{white}
2. for loop & size() \tn 
% Row Count 7 (+ 1)
% Row 6
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{3. for each loop} \tn 
% Row Count 8 (+ 1)
% Row 7
\SetRowColor{white}
4.lambda expression forEach() & list.forEach(name-\textgreater{}name.charAt(0)='h') \tn 
% Row Count 10 (+ 2)
% Row 8
\SetRowColor{LightBackground}
\seqsplit{mapAscii.forEach((key}, value) & can be used to iterate map \tn 
% Row Count 12 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{0.9954 cm} x{3.9816 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{List Interface}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{Duplicable} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\seqsplit{ArrayList} & random access, add/remove expensive(shift),not ordered \tn 
% Row Count 3 (+ 2)
% Row 2
\SetRowColor{LightBackground}
\seqsplit{LinkedList} & sequence access,add/remove cheap(no shift), ordered \tn 
% Row Count 5 (+ 2)
% Row 3
\SetRowColor{white}
Vector & like ArrayList,but synchronized,more methods \tn 
% Row Count 7 (+ 2)
% Row 4
\SetRowColor{LightBackground}
Stack & extends Vector, LIFO, more methods \tn 
% Row Count 9 (+ 2)
% Row 5
\SetRowColor{white}
 & boolean push(),boolean peek(),boolean push(obj) \tn 
% Row Count 11 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{1.24425 cm} x{3.73275 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Queue interface}}  \tn
% Row 0
\SetRowColor{LightBackground}
FIFO & first in first out \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{Ordered list of item to be processed} \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
\seqsplit{PriorityQueue} & no null item, ordered by priority \tn 
% Row Count 4 (+ 2)
% Row 3
\SetRowColor{white}
Deque & interface, doubled ended queue \tn 
% Row Count 5 (+ 1)
% Row 4
\SetRowColor{LightBackground}
\seqsplit{ArrayDeque} & add/remove from both end, faster than ArrayList and Stack \tn 
% Row Count 7 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{1.59264 cm} x{3.38436 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Set}}  \tn
% Row 0
\SetRowColor{LightBackground}
unordered & no duplicate, at most one null \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{Hashset} \tn 
% Row Count 3 (+ 1)
% Row 2
\SetRowColor{LightBackground}
\seqsplit{LinkedListHashSet} & maintain insertion order, permit nulls \tn 
% Row Count 5 (+ 2)
% Row 3
\SetRowColor{white}
SortedSet interface & sorted \seqsplit{ascending/decending/natual} ordering \tn 
% Row Count 7 (+ 2)
% Row 4
\SetRowColor{LightBackground}
TreeSet & ascending order, faster access \tn 
% Row Count 9 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{2.33919 cm} x{2.63781 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Java Collections}}  \tn
% Row 0
\SetRowColor{LightBackground}
\seqsplit{java.util.Collections} & Static methods \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
max() & min() \tn 
% Row Count 3 (+ 1)
% Row 2
\SetRowColor{LightBackground}
sort() & shuffle() \tn 
% Row Count 4 (+ 1)
% Row 3
\SetRowColor{white}
binarySearch() & copy() \tn 
% Row Count 5 (+ 1)
% Row 4
\SetRowColor{LightBackground}
reverse() & \seqsplit{synchronizedCollection()} \tn 
% Row Count 7 (+ 2)
% Row 5
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{disjoin(): split into 3 collection w/o commons} \tn 
% Row Count 8 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{1.69218 cm} x{3.28482 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Comparable and Comparator interfaces}}  \tn
% Row 0
\SetRowColor{LightBackground}
Comparator & equals(), Compare() \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
Comparable & compareTo() \tn 
% Row Count 2 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{2.58804 cm} x{2.38896 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Java Map}}  \tn
% Row 0
\SetRowColor{LightBackground}
key value pairs & not iterable \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\seqsplit{NoSuchElementException} & ClassCastException \tn 
% Row Count 3 (+ 2)
% Row 2
\SetRowColor{LightBackground}
\seqsplit{NullPointerException} & \seqsplit{UnsupportedOperationException} \tn 
% Row Count 5 (+ 2)
% Row 3
\SetRowColor{white}
Object put(Object k, Object v) & add \tn 
% Row Count 7 (+ 2)
% Row 4
\SetRowColor{LightBackground}
void putAll(Map m) & addAll \tn 
% Row Count 8 (+ 1)
% Row 5
\SetRowColor{white}
Object remove(Object k) & remvoe \tn 
% Row Count 10 (+ 2)
% Row 6
\SetRowColor{LightBackground}
Object get(Object k) & get \tn 
% Row Count 11 (+ 1)
% Row 7
\SetRowColor{white}
boolean containsKey(Object k) & ContainsKey \tn 
% Row Count 13 (+ 2)
% Row 8
\SetRowColor{LightBackground}
boolean \seqsplit{containsValue(Object} v) & containsValue \tn 
% Row Count 15 (+ 2)
% Row 9
\SetRowColor{white}
Set entrySet( ) & value-\textgreater{}set \tn 
% Row Count 16 (+ 1)
% Row 10
\SetRowColor{LightBackground}
Set keySet( ) & key-\textgreater{}set \tn 
% Row Count 17 (+ 1)
% Row 11
\SetRowColor{white}
Collection values( ) & value-\textgreater{}collection \tn 
% Row Count 18 (+ 1)
% Row 12
\SetRowColor{LightBackground}
int size( ) & size \tn 
% Row Count 19 (+ 1)
% Row 13
\SetRowColor{white}
void clear( ) & clear \tn 
% Row Count 20 (+ 1)
% Row 14
\SetRowColor{LightBackground}
boolean isEmpty( ) & isEmpty \tn 
% Row Count 21 (+ 1)
% Row 15
\SetRowColor{white}
boolean equals(Object obj) & equals \tn 
% Row Count 23 (+ 2)
% Row 16
\SetRowColor{LightBackground}
int hashCode( ) & hashcode \tn 
% Row Count 24 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{1.54287 cm} x{3.43413 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{iterate on map}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{No iterator} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
1 for each loop & for ( Map.Entry\textless{}String,String\textgreater{} e:myMap.entrySet())\{\} \tn 
% Row Count 3 (+ 2)
% Row 2
\SetRowColor{LightBackground}
 & for (String k:myMap.keySet())\{\} \tn 
% Row Count 5 (+ 2)
% Row 3
\SetRowColor{white}
 & for (String v:myMap.value())\{\} \tn 
% Row Count 7 (+ 2)
% Row 4
\SetRowColor{LightBackground}
2 indrect iterator & Oterator\textless{}Map.Entry\textless{}String,String\textgreater{}\textgreater{} \seqsplit{itr=myMao.entrySet().iterator()} \tn 
% Row Count 10 (+ 3)
% Row 5
\SetRowColor{white}
3 stand for loop & size() \tn 
% Row Count 12 (+ 2)
% Row 6
\SetRowColor{LightBackground}
4 \seqsplit{forEach(lambdas)} & myMap.foreach((k,v)-\textgreater{}...) \tn 
% Row Count 14 (+ 2)
% Row 7
\SetRowColor{white}
5 iterator on key & set value myMap.get(key) \tn 
% Row Count 16 (+ 2)
% Row 8
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{not efficient, not practical} \tn 
% Row Count 17 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{0.89586 cm} x{4.08114 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{HashMap,Treemap and Hashable}}  \tn
% Row 0
\SetRowColor{LightBackground}
\seqsplit{HashMap:} & unique key, dup values;allow null values and null keys \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
\seqsplit{TreeMap} & ordered object \tn 
% Row Count 3 (+ 1)
% Row 2
\SetRowColor{LightBackground}
\seqsplit{HashTable} & synchonized, no nulls \tn 
% Row Count 5 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}


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

\end{document}