scala in action

actor{var counter = 0Def Act () {while (true) {Receive {Case content:string = println ("Message:" + content)Case Hello (name, content,sender) + = {println ("Helloactor:" + "Name:" + name + "Content:" + content + counter)Counter + = 1Thread.Sleep (3000)Sender! Helloback (name, Content+counter, this)}}}}}Class Hellobackactor (Val helloactor:actor) extends actor{var counter = 0Def Act () {Helloactor! Hello ("Spark", "Love Was Here", this)while (true) {Receive {Case content:string = println ("Messa

Build Akka development on IntelliJ idea.Reason for using idea: there is no need to spend time learning to configure; using idea will make it more natural and more intelligent.Support is better on MAVEN,SBT.Some of Maven's features are described, and Maven is much more used.Sample word Count code for a simple explanation.DT Big Data Dream Factory public account: Dt_spark.DT Big Data Dream Factory's public number is Dt_spark, every day will have big data actual combat video release, please continu

Masteractor the way to initialize Mapactor,reduceactor,aggregateactor.DT Big Data Dream Factory public account: Dt_spark.DT Big Data Dream Factory's public number is Dt_spark, every day will have big data actual combat video release, please continue to study.Liaoliang DT Big Data dream factory Scala all videos, PPT and code in Baidu Cloud disk link:http://pan.baidu.com/share/home?uk=4013289088#category/type=0 Qq-pf-to=pcqq.groupQQ Group:DT Big Data Dr

Actorsystem Jian Masteractor.Akka's actor is a tree-shaped structure that can be used to find actors that are distributed across multiple machines, as well as to inherit some of the configuration to sub-actors.The Masteractor is the receiving and forwarding side of the message.Actorsystem run out to shutdown.650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M00/73/0C/wKioL1Xy6jLg3na0AAHWtddXN6k639.jpg "title=" Akka_ Practice.png "alt=" Wkiol1xy6jlg3na0aahwtddxn6k639.jpg "/>DT Big Data Dream

Get a quick look at the Scala technology stackI was hopelessly a huge fan of Scala. After I used the Scala development project and wrote the framework, it seemed to condense into a huge black hole, and the attraction made me fly to it so that I started to deviate from Java. Although Java 8 for the Java camp added a glimmer of light, but it is wistfully, awaited b

, "B"), (3, "C"), (4, "D")) status:scala.collection.immutable.map[int,string] = Map (1-A, 2-B, 3-C, 4-D) scala> status.foreach (x = println (S "Key: ${x._1},value: ${x._2 } ")) key:1,value:a key:2,value:b key:3,value:c key:4,value:d 4) If you want all the keys in the map, the keys method returns iterable. scala> val status = Map ((1, "a"), (2, "B"), (3, "C"), (4, "D")) status:scala.collection.immutable.m

* denom, Denom * That. denom ) } Code 6.2 rational with slave Constructor Scala's constructor starts with Def this (...). The main body of the rational sub-constructor is almost completely calling the main constructor, directly passing its unique parameter, N, as the numerator and 1 as the denominator. Enter the following code to the interpreter to see the effect of the constructor: Scala> Val y = New Rational (3) Y: Rational = 3/1 Th

First, Scala overviewcan expand? Object Oriented? function-type programming compatible with Java Interop Syntax concise ? code line short ? ? abstract control statically typed can examine secure refactoring support concurrency control Customize other control structures Ii. installation of ScalaIdeEclipse (native support, use more complex)IntelliJ (expensive)NetBeans

more object-oriented than languages such as Java and C #.Please noteNumeric types are defined as abstract and final, which means that an instance of a value type cannot be obtained by new. You can create instances of them only through text (Literal).1.2. Packing (Boxing) and unpacking (unboxing)Readers familiar with languages such as Java or C # will know that boxing refers to converting the original type to a reference type (object) for an action th

more operator characters. Action characters are printable ASCII characters, such as +,:,?, ~ or #. The following are the legal operator identities: + + +::: The Scala compiler will make them a valid Java identifier and embed the $ character in the internal "rolling" operator identifier. For example, the identifier:-> represents an internal representation of $colon$minus$greater. Mixed identifiers A mixed

Tags: nbsp idea Big Data development GTK Target 1.3 website startup technology sharingStep Two: Install IntelliJ idea　If 3 nodes such as Master, Slave1, Slave2, it is recommended to install it on the master nodeTo Https://www.jetbrains.com/idea download the corresponding version of the file,Because, I usually install the JDK myself, without the openjdk of CentOS, so I download the version as followsThen unzip it.The following is the directory where IntelliJ idea was installedThen proceed to the

Scala tutorial, scala Programming The following is a complete scala getting started tutorial I have collected from the Internet. I have followed other programming basics to get started. Compared with other languages such as Java, Scala is a complex language. It is a unity of object-oriented and function-oriented. It is

Implicit references (implicit Import)Scala automatically adds several implicit references to each program, just as the Java program automatically adds a Java.lang package. In Scala, the contents of the following three packages are implicitly referenced to each program. The difference is that Scala also implicitly adds a reference to the Predef, which greatly faci

This course focuses onSpark, the hottest, most popular and promising technology in the big Data world today. In this course, from shallow to deep, based on a large number of case studies, in-depth analysis and explanation of Spark, and will contain completely from the enterprise real complex business needs to extract the actual case. The course will cover Scala programming, spark core programming, spark SQL and spark streaming, spark kernel and source

Scala supports scripts 1) create a file hello. Scala under/opt/Scala-script and edit the file as follows: $ Hello, this is the first Scala script 2) run the script 　　　　 The command line parameters of the scala script are saved in the sc