scala in depth

1. To install the JDK first:Http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.htmlAfter the installation is successful, you can see the version information in the terminal input java–version for the installation to succeed:? ~ Java-versionjava Version "1.8.0_65" Java (tm) SE Runtime Environment (build 1.8.0_65-b17) Java HotSpot (tm) 64-bit Ser Ver VM (build 25.65-b01, Mixed mode)2. Install ScalaTo the Scala website, down

Label:PerformThe previous article described how to use the built-in DSL support provided by Scala to implement a parser that can parse SQL, how to get the parsing results-ast, how to operate on the data, and get the results we want. Previously, the reason for choosing Scala as an implementation of this engine is that Scala provides convenient DSL implementation s

from:http://mkaz.com/solog/scala/using-scala-with-jdbc-to-connect-to-mysql.html Using Scala with JDBC to connect to MySQL Date:may 27, 2011 A howto on connecting Scala to a MySQL database using JDBC. There is a number of database libraries for Scala, but I-ran into a probl

In a keynote speech with Martin Fowler, he provided a keen observation report: The legacy of Java is the platform , not the language . The original Java technical engineer had made a great decision to separate the language from the runtime, eventually enabling more than 200 languages to run on the Java platform . This infrastructure is critical to the long-term viability of the platform because the life of the computer programming language is usually very short. Since 2008

Java 8 vs. Scala Lambda expressions, scalalamloud Hussachai Puripunpinyo considers Java as a static strong-type language. Therefore, although Java 8 has become a first-class citizen, it can be passed as a function parameter or return value, but it must have a type, that is, the interface, and the Lambda expression is the object that implements the Functional interface. Although developers do not need to worry about creating function objects, the compi

Slick is the Scala database access library launched by TypeSafe. Developers can use the Scala language to write data queries, rather than SQL. Example code: packagecom. testimportscala. slick. driver. MySQLDriver. simple. _ importcom. mysql. jdbc. jdbc2.optional. MysqlDataSourceimportscala Slick is the Scala database access library launched by TypeSafe. Developer

What is Scala?　　S-Cala is a language designed to achieve scaleable language. Officially, it is called the mixed language of object-oriented language and functional language.Scala can be seamlessly spliced with Java programs, because Scala files are compiled as. class files and run on the JVM.Spark was developed by Scala.Scala installation?　　Here's the process of installing

variable, advanced and post - ImportScala.collection.mutable.Stack Val Stack=NewStack[int] Stack.push (1) Stack.push (2) Stack.push (3) println (stack.top) println (Stack) println (stack.pop) println (Stack)Set, Map, TreeSet, TREEMAP related operations1.Set, Map related operations: Set and map elements are mutable variable is also unordered2.TreeSet, TreeMap related operations: TreeMap and TreeSet can be used to sort theImportscala.collection.mutableImportScala.collection.mutable.TreeSetImpo

First, install the JDKNote: Scala runs on top of the JVM, requires installation of the JDK as a prerequisite, and chooses version 1.7.*, which is better compatible with Scala 2.10.* version1. Download: Download the JDK installation documentation from http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html Jdk-7u72-linux-x64.tar.gz2. Unzip: Unzip the installation document to the s

Label: Scala Io stream Scala Read File Scala Write File Scala copy file Scala network IoLifecycle lifecycle 6. Io6.1. File I/O6.1.1. Read files Scala is unique to Scala. Io. source, for

Install jdk1.7.0_60 and scala2.10.4 on the development machine and configure the relevant environment variables. Many online data, installation process ignored. In addition, Eclipse uses Luna4.4.1,idea to use the 14.0.2 version.1. Eclipse Development Environment Building1.1. Install the Scala pluginInstalling the Eclipse-scala-plugin plug-in, http://scala-ide.org

Getting Started with Scala eclipse environment and the first getting Started classic program HelloWorldIDE Select and download:Scala for eclipse Download:Http://scala-ide.org/download/sdk.htmlSelect the appropriate IDE according to your machine configuration:Here I select the for scala2.11 version of the Windows-a-bit IDE, click Download.Scala Installation:installation package, enter the official website: h

SBT Introduction SBT is a code compilation tool, is the Scala world mvn, can compile Scala,java, etc., need java1.6 above. SBT Project Environment Establishment SBT compilation requires a fixed directory format, and requires networking, SBT will download the dependent jar package to the user's home. Ivy2 below, the directory structure is as follows: |--build.sbt |--lib |--project |--src | |--main | | |--

Reference from "Programming in Scala" first, access control modifier Package members, classes, or objects can be decorated with access control modifiers, such as private and protected, which control the access of other parts to these classes, objects. Scala and access control are generally similar to Java, but there are some important differences, which are described in this article. Private Members Scala's

In fact, the use of macros is not difficult, the API has helped us do everything, we just focus on how to use the Get macro parameters and the return value of the macro An example: Import scala.reflect.macros.Context Import scala.collection.mutable.{ Listbuffer, Stack} object Qstringimpl { def qmap (P:char = int,elem:string): INT = Macro Qstringimpl.map_impl def Map_impl (c:context) (P:c.expr[char = int],elem:c.expr[string]): c.expr[int] = { import c.universe._ Import Scala.langua

Similar to Java,scala, there is also the concept of classes and objects. I. Classes, properties, and methods 1. ClassA class is an abstraction of a kind of thing, and when a class is defined, it can be defined as a template that defines a series of objects of that class. For example, you have one of the following templates Human: Having a name, having a brain, having limbs, having sex, being able to think, having a language ability; The a

IntroducedScala is a functional object- oriented language that incorporates many unprecedented features while running on top of the JVM . As developers become more interested in Scala , and more and more tools are available, the Scala language will undoubtedly be an essential tool in your hands .MongoDB is a product between a relational database and a non-relational database, the most versatile of the non-r

Collection Basics See the previous blog post Scala quick Learning (ii).This article is primarily acombinator, because it is useful to find in practice. Main reference: http://www.importnew.com/3673.htmlList(1,2,3) map squaredThe function is applied separately on each element of the list, squared and a new list is returned, possibly List(1,4,9) . We refer to map operations like this as a combination . Features: The parameters of the assembly are all fu

Spark Scala Enumeration* The set of enumerations in Java cannot be used directly in Scala* Enumerations in Scala are implemented using lightweight enumeration* The enumeration in Scala is actually a companion object* Enumerations in Scala do not have a method override funct

The constructor in Scala is more special than that in Java. It can be divided into two types: Master constructor, slave constructor. The main constructor is mixed with the definitions of fields and methods in the class. In Scala, you do not need to define a method with the same class name in the class as Java to act as a constructor. The parameter list of the main constructor is written after the class name