scala akka

Package Com.leegh.actorImport Scala.actors.Actor/*** @author Guohui Li*/Object First_actor extends Actor {Def Act () {for (I println ("Step:" + i)println (Thread.CurrentThread (). GetName)Thread.Sleep (2000)}}}Object Second_actor extends Actor {Def Act () {for (I println ("Step further:" + i)println (Thread.CurrentThread (). GetName)Thread.Sleep (2000)}}}Object Hello_actor {def main (args:array[string]): Unit = {First_actor.start ()Second_actor.start ()}}Report:This blog description:1. Organize

Package Com.leegh.parameterization/*** @author Guohui Li*/Class PersonClass Student extends PersonClass C[+t] (Val args:t)Trait Friend[-t] {def makefriend (Somebody:t)}Object Variance {def makefriendwithyou (S:student, f:friend[student]) {f.makefriend (s)}def main (args:array[string]): Unit = {Val Value:c[person] = new C[student] (new Student)}}Report:This blog description:1. Organize your ideas and improve yourself.2. Be educated in Liaoliang teacher, what to gain, so recommend.3. Blog focus on

In the first two sections, we learned about Scala's objects and associated objects, both of which are used to mean the static members of Java. There are no static fields and static methods in Scala. A static member destroys the complete object-oriented model that Scala supports. However, it is possible to implement class-level operations on Scala through the asso

Package Com.leegh.parameterization/*** @author Guohui Li*/Class Pair[t def bigger = if (First.compareto (second) > 0) First Else second}Class Pair_lower_bound[t] (Val first:t, Val second:t) {def Replacefirst[r;: T] (newfirst:r) = new Pair_lower_bound[r] (Newfirst, second)}Object Type_variables_bounds {def main (args:array[string]): Unit = {Val pair = new pair ("Spark", "Hadoop")println (Pair.bigger)}}Report:This blog description:1. Organize your ideas and improve yourself.2. Be educated in Liaol

First, prefaceThe Scala program uses Unicode's BMP character set (Wiki:bmp character set), which is not currently supported by the Unicode supplement character set. This chapter defines Scala's syntactic analysis from Scala models and XML models. If not specifically mentioned, the default refers to the Scala model and specifies that the characters are ASCII \u000

Scala code in one day (7) and scala code in one dayScala code in one day (7)To better control spark, I recently studied scala language features, mainly reading "quick learning scala" and writing down some codes that I think are useful. Package examplesclass Angela {// package visibility This specifies that this method

Scala code in one day (9) and scala code in one dayScala code in one day (9)To better control spark, I recently studied scala language features, mainly reading "quick learning scala" and writing down some codes that I think are useful. Package examplesimport scala. io. sour

Package Com.leegh.parameterization/*** @author Guohui Li*/Import Scala.reflect.ClassTagClass Trible[f, S, T] (Val first:f, Val second:s, Val third:t)Object Hello_type_parameterization {def main (args:array[string]): Unit = {val triple = new Triple ("Spark", 3, 3.1415)Val bigdata = new triple[string, String, Char] ("Spark", "Hadoop", ' R ')def Getdata[t] (list:list[t]) = List (LIST.LENGTH/2)println (GetData (List ("Spark", "Hadoop", ' R '))Val F = getdata[int]_println (f (List (1,2,3,4,5,6,7,8)))

Github:https://github.com/nscala-time/nscala-timeMAVEN: (Pay attention to the Scala version)Dependency> groupId>Com.github.nscala-timegroupId> Artifactid>nscala-time_2.10Artifactid> version>2.6.0version>Dependency>code example:Remember import com.github.nscala_time.time.imports._ scala> DateTime.Parse ("20150101", DateTimeFormat forpattern ("YyyyMMdd"))Res11:org.joda.time.DateTime = 2015-01-01t00:0

1. Some additions to the previous tutorial on Scalaval files = array[string] ("A.txt", "B.txt", "C.txt")For (f Goal one: Familiarity with Scala actor concurrent programmingGoal two: Prepare for learning Akka　　　　Note: The Scala actor We are now learning is the Scala 2.10.x version and the previous version of the actor.S

1. Create a map 1) Create immutable mappings scala> val status = Map (1, "a", 2, "B") status:scala.collection.immutable.map[int,string] = map (1-A , 2-B) scala> val status = Map ((1, "a"), (2, "B")) status:scala.collection.immutable.map[int,string] = Map (1-A, 2-B) 2) Create a mutable mapping either by importing it into the scope or by specifying the full path to the Scala.collection.mutable.Map class w

Pyspark, Dpark Hadoop Spark Kunkernetes Machine learning Classes category Python Java Scala Go Svm Pyml Libsvm - - Liblinear Pyml - - - Machine Learning Toolkit Scikit-lean Flink, Mahout Mllib Bayesian, Gobrain, Golearn, LIBSVM Topic model Gensim - - - Natural language Processing

(LogFile, 2). Cache () Val numas = logdata.filter (line => line.contains ("a")). Count () Val numbs = logdata.filter (line => line.contains ("B")). Count () println ("Lines with a:%s, Lines with B:%s". Format (Numas, numbs)) } } 9, under project_home/edit SIMPLE.SBT Name: = "Simple Project" Version: = "1.0" Scalaversion: = "2.10.4" Librarydependencies + + "Org.apache.spark"% "Spark-core"% "1.0.2" resolvers + = "Akka Repository" at "http://repo.akka

Package Com.leegh.parameterization/*** @author Guohui Li*/Object Type_contraints {def main (args:array[string]): Unit = {def Rocky[t] (i:t) (implicit ev:t println ("Life is too short,you need spark!")}Rocky ("Spark")}}Report:This blog description:1. Organize your ideas and improve yourself.2. Be educated in Liaoliang teacher, what to gain, so recommend.3. Blog focus on practice, superfluous words are not much to say, are doing technology.4. Information from DT Big Data Dream Factory public accou

650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M01/6F/91/wKioL1WhEYHR0V55AAi8dfKDnAg782.jpg "title=" 002- Scala function definition, Process Control, exception handling get started in combat. png "alt=" wkiol1wheyhr0v55aai8dfkdnag782.jpg "/>002-scala function definition, Process Control, exception handling getting started combatScalafunction Definitionstatement end no semicolondefining an parameter

3, hands-on generics in Scalageneric generic classes and generic methods, that is, when we instantiate a class or invoke a method, you can specify its type, because Scala generics and Java generics are consistent and are not mentioned here. 4, hands on. Implicit conversions, implicit parameters, implicit classes in Scalaimplicit conversion is one of the key points that many people learn about Scala, which i

Scala code in one day (5) and scala code in one dayScala code in one day (5)To better control spark, I recently studied scala language features, mainly reading "quick learning scala" and writing down some codes that I think are useful. Package examplesclass Person {val publicVal = 1 // automatically generate getter var

Answer the previous article.1. Is there also a syntax for declaring upper bound and Lower Boud in Java? Some, such as:ListWhat is the difference between listListListPackage Tstge;import java.util.*;p ublic class Tst {public static void main (string[] args) {arraylistThe type of 3.Java can usually be translated directly into the Scala type. But like IteratorIterator[t] Forsome {type T} or Iterator[_]Iterator[t] Forsome {type T About Forsome,stack overf

1, Java Operation Test jar: Execute---java-classpath f:/testhello.jar Test2 Or JAVA-CP F:/testhello.jar Test2 Print Results: Hello World The Java classes are as follows: /** * Document: This kind of function----> Print Hello World * USER:YANGJF * date:2016/9/25 9:48 /Public Class Test2 {public static void Main (string[] args) { System.out.println (' Hello World '); } 2, Scala operation Test jar: Execute--"

NothingNothing is a subclass of all types, and is also a subclass of NULL. Nothing has objects, but can be used to define types. For example, if a method throws an exception, the return value type of the exception is nothing (although it is not returned).def get(index:Int):Int = { if0thrownew Exception(...) else ....}If the statement is an expression with a return value, there must be a return value type, if x NullNull is a subclass of all Anyref, in Scala's type system, Anyref is a subcla