scala programming tutorial

actor receives cannot match the partial function in the message processing, causes the actor mailbox to be filled with some irrelevant messages, in general, will add a case _ option in the actor's Receive method, Enables the Receive method to process all messages received in the mailbox.Object Actorcaseobject {def main (args:array[string]): Unit = {Val lercy81=new person ("lercy81", "Chengdu")Actor_case.start//Send a Case class object pastActor_case! LERCY81//enable the main thread actor to rec

)), Binop ("+", Var ("x"), Number (1)))ValE2 = Binop ("+", Binop ("/", Var ("x"), Number (2)), Binop ("/", Number (1.5), Var ("x")))ValE3 = Binop ("/", E1, E2)defShow (e:expr) = println (F.format (E) +"\ n") for(e Final Print Effect:1 - * (x + 1)2 x 1.5- + ---2 x 1 - * (x + 1)2 ----------- x 1.5 - + --- 2 x reprint Please indicate the author Jason Ding and its provenanceGitcafe Blog Home page (http://jasonding1354.gitcafe.io/)GitHub Blog Hom

Demonstrates value functions, anonymous functions, closures ...Other specific applications, but also in the production of it.This is over. Other Sam,curry, higher-order functions, sets, generics, implicit classes: These, or find a special book to get a deeper understanding of ...C:\users\hengheng>scalawelcome to Scala version 2.11.6 (Java HotSpot (TM) 64-bit Server VM, Java 1.6.0_43). Type in expressions to has them evaluated. Type:help for more infor

Simplified implementation of bank account: scala> class bankaccount{ | Span style= "color: #0000ff;" >private var bal:int = 0 | def balance:int = bal | def deposit (amount:int) { | require (Amount > 0) | Bal += Amount | | | def withdraw (amount:int): Boolean = | if (Amount > Bal) false | else { | bal-= amount | true | | }defined class BankAccount The BankAccount class defines the private variable bal, and three public methods:

Scala's most attractive point is actor's concurrent programming. However, looking at Scala official documents, Baidu documents and IBM documents, all of them are passed through strings. If they are used as actor programming, there is certainly no problem. However, in the official opening process, the light transfer string is obviously weak. So how to transfer obj

1, react and receive differencesAll actors share a thread pool, the total number of threads can be configured, or depending on the number of CPUs; When an actor is started, Scala assigns a thread to use it, and if the receive model is used, the thread will always be the actor, if you use the REACT model , Scala throws an exception when it finishes executing the React method, and the thread can be used by ot

realaction with Tbeforeafter with TtwiceactionAct2.doactionVal act3 = new realaction with ttwiceaction with TbeforeafterAct3.doaction }}/entry before-action* * Real Action done!! **/exit after-actionThen define other aspects for him, and then add those aspects to the same object's methods. Then define an aspect that will execute the source method two times.　Trait Ttwiceaction extends Taction { abstract override def doAction {for (I println ("==>no." + i)}} Below, Tbeforeafter and

1. Arbitrary multi parameters funcs sum(1,2,3,4,5) = sum(1 to 5: _*)the equal ‘=‘ can be ignored if there is none return val 1 def sum(args: Int*) = {2 var result = 03 for(arg Scala Array Buffer to Java list: 1 import scala.collection.JavaConversions.bufferAsJavaList2 import scala.collection.mutable.ArrayBuffer3 val command = ArrayBuffer("ls","-al","/home/mike")4 val pb = new ProcessBuilder(command) Reverse operation 1 import scala.collection

Package Com.xing.listfile/** * Created by Dengni on 2017/2/12. * Scala type System programming Combat: * 1,scala classes and methods, functions can be generic, in the spark source code can be seen everywhere the generics of classes and methods, in the actual instantiation of the type of specific *, such as spark the most core, most basic, most important abstract

Annotations is structured information added to program source code. LikeComments, they can be sprinkled throughout a program and attached to anyVariable, method, expression, or other program element. Unlike comments,They has structure, thus making them easier to machine process.Annotations are structured information that is attached to the source code, like annotations, scattered across the program. Annotations can be attached to any variable, a method, an expression, or other program element. B

converting arrays using yield and functional programming//convert to array, get or AarryVal A = Array (1,2,3,4,5) Val A2= for(Ele Ele//convert to Arraybuffer, get or ArraybufferVal B =Arraybuffer[int] () b+ = (1,2,3,4,5) Val B2= for(ele Ele//Combine if guard, convert only required elementsVal a3= for(Ele ifEle% 2==0) yield ele*Ele//convert arrays using functional programming (usually the first way)A.filter

state at which the thread is eligible to run. In fact, this three-state combination is one, and its common denominator is that the thread is still alive, but there is no condition to run at the moment. In other words, it is operational, but if an event occurs, he may return to the operational state.5. Death state: When the thread's run () method finishes, it is considered dead. This thread object may be alive, but it is not a separate thread. Once a thread dies, it cannot be resurrected. If you

Video materials are checked one by one, clear high quality, and contains a variety of documents, software installation packages and source code! Perpetual FREE Updates!Technical teams are permanently free to answer technical questions: Hadoop, Redis, Memcached, MongoDB, Spark, Storm, cloud computing, R language, machine learning, Nginx, Linux, MySQL, Java EE,. NET, PHP, Save your time!Get video materials and technical support addresses-------------------------------------------------------------

Shell advanced programming video tutorial-follow the old boy step by step to learn Shell advanced programming practical video tutorial, advanced programming shell Shell advanced programming video

Link to the PHP object-oriented programming getting started tutorial, and the OOP Getting Started Tutorial. Link to the PHP object-oriented programming getting started tutorial, the OOP Getting Started Tutorial PHP official learni

Tutorial on interrupt and return in Ruby programming and tutorial on ruby programming usage The use of the return, break, and next keywords involves the issue of jumping out of the scope. Their difference lies in the different scopes of different keywords jumping out, because there are code blocks, you need to pay spec

reader wants to do when he or she intends to learn a new language, and, of course, to write a few small programs to familiarize themselves with the grammar. However, many of the tutorials are only one or two lines of miniature code examples, just enough to demonstrate a feature, but not a single, useful program. If the language also has a built-in shell (or interpreter), such as Ruby, Groovy, and Scala, then the trend is becoming more pronounced.For

Link to the PHP Object-Oriented Programming getting started tutorial and the OOP getting started tutorial PHP learning OOP: http://php.net/manual/zh/oop5.intro.php Source: http://blog.snsgou.com/post-41.html PHP object-oriented programming full Tutorial: 1. What is object

as the characteristics of the object-oriented programming, and is improving the template-characterized generic programming. C + + is a hybrid programming language, which can be programmed by program design method for various purposes. It does not abandon the practical characteristics of efficient operation, but also strives to improve the

PHP object-oriented programming (video tutorial ). Object-oriented programming (ObjectOrientedProgramming, OOP, object-oriented programming) is a computer programming architecture, one of the basic principles of OOP is that a computer program is a computer