Getting started with Maven Useful command line options

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Git Cheat Sheet, Create a Repository Working with Branches Make a change Synchronize. From scratch Create a new local List all local branches Stages the file ready for commit Get the latest changes from origin. repository git branch git add file no merge,git init project name git fetch. List all branches local and remote Stage all changed files ready for commit. Download from an existing repository git branch av git add Fetch the latest changes from origin. git clone my url and merge, Switch to a branch my branch Commit all staged files to versioned history git pull. and update working directory git commit m commit message. Observe your Repository git checkout my branch Fetch the latest changes from origin. List new or modified files not yet Commit all your tracked files to and rebase. committed Create a new branch called new branch versioned history git pull rebase. git status git branch new branch git commit am commit message. Push local changes to the origin, Show the changes to files not yet staged Delete the branch called my branch Unstages file keeping the file changes git push. git diff git branch d my branch git reset file, Show the changes to staged files Merge branch a into branch b.
Revert everything to the last commit, git diff cached git checkout branch b When in doubt use git help. git reset hard,git merge branch a git command help. Show all staged and unstaged,file changes, Tag the current commit Or visit https training github com. git diff HEAD,git tag my tag for official GitHub training. Show the changes between two,commit ids,git diff commit1 commit2.
List the change dates and authors,for a file,git blame file. Show the file changes for a commit,id and or file,git show commit file. Show full change history,Show change history for file directory. including diffs,git log p file directory,Java Collections Cheat Sheet. What can your collection do for you,Notable Java collections.
libraries Your data Operations on your collections. Collection class Thread safe alternative Duplicate Order of iteration Performant Random access. Individual Key value Primitive,element contains,elements pairs support. support FIFO Sorted LIFO check By key By value By index. HashMap ConcurrentHashMap,http fastutil di unimi it. Fast compact type specific collections for Java Maps synchronizedBiMap. HashBiMap Guava,new HashBiMap,Great default choice for collections of primitive. ArrayListMultimap Maps synchronizedMultiMap,types like int or long Also handles big. Guava new ArrayListMultimap,collections with more than 231 elements well.
Collections synchronizedMap,LinkedHashMap,new LinkedHashMap. TreeMap ConcurrentSkipListMap,https github com google guava Int2IntMap Fastutil. Google Core Libraries for Java 6,ArrayList CopyOnWriteArrayList. Perhaps the default collection library for Java, projects Contains a magnitude of convenient Collections newSetFromMap. new ConcurrentHashMap,methods for creating collection like fluent.
builders as well as advanced collection types IntArrayList Fastutil. PriorityQueue PriorityBlockingQueue,Eclipse Collections ArrayDeque ArrayBlockingQueue. https www eclipse org collections, O log n complexity while all others are O 1 constant time when using Queue interface methods offer poll. Features you want with the collections you need,Previously known as gs collections this library. includes almost any collection you might How fast are your collections. need primitive type collections multimaps,bidirectional maps and so on Random access Search. Collection class Insert Remember not all operations are equally fast Here s a reminder. by index key Contains,of how to treat the Big O complexity notation.
ArrayList O 1 O n O n O 1 constant time really fast doesn t depend on the. JCTools size of your collection, https github com JCTools JCTools HashSet O 1 O 1 O 1. Java Concurrency Tools for the JVM O log n pretty fast your collection size has to be. If you work on high throughput concurrent extreme to notice a performance impact. HashMap O 1 O 1 O 1,applications and need a way to increase your. O n linear to your collection size the larger your. performance check out JCTools, TreeMap O log n O log n O log n collection is the slower your operations will be. Java Generics cheat sheet vis it rebe e cheat s heets. ll abs org, Basics Producer Extends Consumer Super PECS Method Overloading. Generics don t exist at runtime Collections copy List super T dest List extends T src String f Object s. return object, class Pair T1 T2 src contains elements of type T or its subtypes.
the type parameter section in angle String f String s. dest accepts elements so defined to use T or its supertypes return string. brackets specifies type variables, Type parameters are substituted when T String generic T t. Consumers are contravariant use super Producers are covariant use extends. objects are instantiated return f t,Pair String Long p1 new. Pair String Long RL 43L If called generic string returns object. Avoid verbosity with the diamond operator,Pair String Long p1. Recursive generics, new Pair RL 43L Recursive generics add constraints to. your type variables This helps the compiler,to better understand your types and API.
interface Cloneable T extends,Collection Object heterogenous. Cloneable T,any object goes in,Collection homogenous collection. of arbitrary type,Now cloneable clone clone, Avoid using wildcards in return types will compile. Intersection types Covariance,T extends Object List Number ArrayList Integer. Comparable super T T,max Collection extends T coll Collections are.
not covariant,The return type here is Object,Compiler generates the bytecode. for the most general method only,Stream examples, Get the unique surnames in uppercase of the first 15 book. authors that are 50 years old or over,library stream. map book book getAuthor,filter author author getAge 50. map Author getSurname,map String toUpperCase,collect toList.
Compute the sum of ages of all female authors younger than 25. library stream,Intermediate operations map Book getAuthor. Always return streams Lazily executed filter a a getGender Gender FEMALE. map Author getAge,filter age age 25,reduce 0 Integer sum. Common examples include,Preserves Preserves Preserves. count type order Terminal operations,Return concrete types or produce a side effect. map Eagerly executed,Common examples include,Function Output When to use.
reduce concrete type to cumulate elements,sorted collect list map or set to group elements. to perform a side effect,peek forEach side effect,on elements. BROUGHT TO YOU BY, JVM Options cheat sheet vis it rebe e cheat s heets. ll abs org, Standard Options Non Standard Options Advanced Options. java java X BEHAVIOR PERFORMANCE, List all standard options List all non standard options.
XX UseConcMarkSweepGC XX MaxPermSize 128m Java 7 or earlier. Dblog RebelLabs Xint Enables CMS garbage collection Sets the max perm space size in bytes. Sets a blog system property to RebelLabs Runs the application in interpreted only. Retrieve set it during runtime like this mode XX UseParallelGC XX ThreadStackSize 256k. Enables parallel garbage collection Sets Thread Stack Size in bytes. System getProperty blog Xbootclasspath path Same as Xss256k. RebelLabs Path and archive list of boot class files XX UseSerialGC. Enables serial garbage collection XX UseStringCache. System setProperty blog RL Xloggc filename Enables caching of commonly. Log verbose GC events to filename XX UseG1GC allocated strings. javaagent path to agent jar Enables G1GC garbage collection. Loads the java agent in agent jar Xms1g XX G1HeapRegionSize 4m. Set the initial size in bytes of the heap XX FlightRecorder requires Sets the sub division size of G1 heap. agentpath pathname XX UnlockCommercialFeatures in bytes. Loads the native agent library specified by Xmx8g Enables the use of the Java Flight Recorder. the absolute path name Specifies the max size in bytes of the heap XX MaxGCPauseMillis n. Sets a target for the maximum GC, verbose class gc jni Xnoclassgc DEBUGGING pause time. Displays information about each loaded Disables class garbage collection XX ErrorFile file log. class gc event JNI activity XX MaxNewSize 256m,Save the error data to file log. Xprof Max size of new generation in bytes, Profiles the running program XX HeapDumpOnOutOfMemory. XX AggressiveOpts,Enables heap dump when,Enables the use of aggressive performance. OutOfMemoryError is thrown,optimization features,XX PrintGC.
XX OnError cmd args,Enables printing messages during. Run user defined commands,garbage collection,on fatal error. XX TraceClassLoading,Enables Trace loading of classes. XX PrintClassHistogram,Enables printing of a class instance histogram. after a Control C event SIGTERM,Regex cheat sheet vis it rebe e cheat s heets.
ll abs org, Character classes Useful Java classes methods Quantifiers. abc matches a or b or c PATTERN, abc negation matches everything except a b or c A pattern is a compiler representation of a regular expression Greedy Reluctant Possessive Description. a c range matches a or b or c,Pattern compile String regex. a c f h union matches a b c f g h X X X X once or not at all. Compiles the given regular expression into a pattern. a c b c intersection matches b or c, a c b c subtraction matches a X X X X zero or more times. Pattern compile String regex int flags, Compiles the given regular expression into a pattern.
X X X X one or more times,Predefined character classes with the given flags. Any character boolean matches String regex X n X n X n X exactly n times. d A digit 0 9 Tells whether or not this string matches the given. D A non digit 0 9 regular expression, s A whitespace character t n x0B f r X n X n X n X at least n times. S A non whitespace character s String split CharSequence input. w A word character a zA Z 0 9 Splits the given input sequence around matches of X at least n but. X n m X n m X n m, W A non word character w this pattern not more than m times. String quote String s Greedy matches the longest matching group. Boundary matches Returns a literal pattern String for the specified String Reluctant matches the shortest group. The beginning of a line Possessive longest match or bust no backoff. The end of a line Predicate String asPredicate, b A word boundary Creates a predicate which can be used to match a string. B A non word boundary Groups backreferences,A The beginning of the input MATCHER.
G The end of the previous match An engine that performs match operations on a character A group is a captured subsequence of characters which may. Z The end of the input but for the final terminator if any sequence by interpreting a Pattern be used later in the expression with a backreference. z The end of the input boolean matches,defines a group. Attempts to match the entire region against the pattern. N refers to a matched group,Pattern flags boolean find. d d a group of two digits, Pattern CASE INSENSITIVE enables case insensitive Attempts to find the next subsequence of the input. d d 1 two digits repeated twice,matching sequence that matches the pattern. 1 refers to the matched group,Pattern COMMENTS whitespace and comments starting.
with are ignored until the end of a line int start. Pattern MULTILINE one expression can match,multiple lines. Returns the start index of the previous match,Logical operations. Pattern UNIX LINES only the n line terminator int end XY X then Y. is recognized in the behavior of and Returns the offset after the last character matched X Y X or Y. CHEAT SHEETS WEB PAGE 1,Markdown Cheat Sheet,Ralph Mason Author Paragraphs Core Markdown. Paragraphs don t require markup but make sure,Headings Core Markdown. There s a line break before and after it, This is an H1 There are no spaces or tabs at the start of it.
This is an H2,This is an H3,This is an H6 Unordered Lists Core Markdown. or Top level item,Top level item,Nested item,This is an H1. This is an H2 Optionally use or instead of,Indent nested items by 2 spaces. Lists must have a line break before and after,List items can be indented by max three spaces. or one tab,Ordered Lists Core Markdown,Hanging indents for wrapped lines are supported.
1 Top level item,This is nicer to read,2 Top level item. in plain text,3 Top level item,1 Nested item,2 Nested item. Paragraphs in List Items Core Markdown,You must include a after each number. Markdown will output items in order 1 2 3 Adding line breaks between list items will wrap the. even if you write unorderly 1 3 2 list item content in p tags. Text Formatting Core Markdown,This is em text and so is this. This is strong text and so is this For multiple paragraphs in a list item indent each. This is strong text inside em text one by four spaces or a tab rst item optional. This is em text inside strong text,This is strong and em combined.
Paragraph 1,Paragraph 2,CHEAT SHEETS WEB PAGE 2,Markdown Cheat Sheet. Blockquotes Core Markdown,Ralph Mason Author,One paragraph in. Getting started with Maven s rg Useful command line options DskipTests true compiles the tests but skips running them Dmaven test skip true skips compiling the tests and does not run them T number of threads T 4 is a decent default T 2C 2 threads per CPU rf resume from resume build from the specified project pl projects makes Maven build only specified modules and not the whole

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