scala in depth

Control structures and functions 1. Write a sample program to show whyPackage Com.horstmann.impatientdiffers fromPackage comPackage HorstmannPackage impatientDescription: The difference is that the upper layer of the latter package is also visible, while the string is only visible in the current package scopeProgram code: B.scala Package com{ Package horstmann{ Object a{ def hi=println ("I am A") } Package impatient{ Object B extends app{ def Hi=a.hi Hi } }

Scala is a strong static language that integrates object-oriented and functional features and can run on JVM. Because it can run on JVM and draw on a large number of Java language features during design, it can interact with Java and call Java-related class libraries, this makes great use of the intellectual investment of programmers who have mastered Java. It also draws on the elang function language and Ruby and other scripting languages to provide

Scala"", "Sans-serif" '> and groovy are both JVM-based languages, which have more concise syntax and rich expression capabilities than Java. Scala and groovy are good choices for developers who want to avoid tedious Java statements without leaving the JVM. But which one can take the lead in the future development process? Which one is the future development direction? These are problems that plague develope

In other words, ivony... wrote in Lao Zhao, "using Scala language (below) on the. NET platform: analysis," commented on the 18th floor of this article: I use scala. net in the Ubuntu operating system, and this should not be the case. So let's test it. Now, we add a DOTNET. CS file, as shown below: using System;using System.IO;using System.Web;using System.Collections.Generic;namespace Skyiv{ public class

Scala has a lot in common with Java, but it's a lot different. This is primarily a Java developer's perspective, summarizing some of the thinking changes that are faced in the process of using Scala. Here is just a summary of the two languages in the development process of the different, will be updated after some switching in the development process is worth noting. The following is a list of some of t

There is a big data project, you know the problem area (problem domain), you know what infrastructure to use, and maybe even decide which framework to use to process all of this data, but one decision has been delayed: which language should I choose? (or perhaps more specifically, the question is, what language should I force all my developers and data scientists to use?) This question will not be postponed for too long, but will be decided sooner or later.Of course, nothing prevents you from us

The name of the Scala language comes from the "extensible language", and Scala is a language that blends the function objects. It can run on the Java platform, and the Scala program is compiled into the JVM's byte code. Their performance is usually consistent with Java programs. Scala code can invoke Java methods, Acce

Array-related operations Summary:This article mainly learns how to manipulate arrays in Scala. Java and C + + programmers typically use arrays or approximate structures , such as array lists or vectors , to collect a set of elements. In Scala, we have more choices, but now let's assume that we don't care about other choices, but just want to start using arrays right away. The main points of this

This is a creation in Article, where the information may have evolved or changed. See the previous: Java, Scala, and go languages multi-threaded concurrency comparison test. Related code Download: http://qinhui99.itpub.net/resource/2570/31876Test results and conclusionsCount the number of prime numbers in a 1~n, and record the time spent. The same n, the less time performance the better. AMD Dual Core 2.8G, 4G memory winxp Java+conc java+akka1.3java+a

Scala is written specifically for the Java™ platform, so its syntax design makes Java code-coding people feel relaxed. At the same time, Scala provides the JVM with the inherent power of functional languages, and starts with these functional design concepts. In this issue of the Scala Guide series for Java developers, Ted Neward will introduce nuances between the

Let me start with Scala and get to know Scala in this chapter: 1, why I study Scala, the difference between her and Java 2, basic types in Scala and Operations 3, Scala classes and objects Why I study Scala, the difference betwee

1.Scala Implicit thorough explanationimplicit conversion implicit, which can be manually specified to convert an object of some type, or a class, into other types of classes or objectsForm: Implicit def functionImplicit functions, implicit arguments, implicit objects, implicit classesimplicit function : Refers to a function with implicit pre-modificationScala uses the implicit conversion function's signature primarily as the input type, depending on t

In the first two articles, to run the scala. Net program, we need to copy predef. DLL to the current directory. This is unpleasant. First, I thought of adding predef. DLL to the Global Assembly Cache (GAC, Global Assembly Cache), as shown below: ben@ben-m4000t:~$ sudo gacutil -i /opt/scala-2.7.7.final/lib/predef.dllFailure adding assembly /opt/scala-2.7.7.final

Learn Spark 2.0 (new features, real projects, pure Scala language development, CDH5.7)Share--https://pan.baidu.com/s/1jhvviai Password: SirkStarting from the basics, this course focuses on Spark 2.0, which is focused, concise and easy to understand, and is designed to be fast and flexible.The course is based on practical exercises, providing a complete and detailed source code for learners to learn or apply to the project.The course courseware is also

1, Scala and Java have 7 numeric types: int, short, long, byte, float, double, Boolean 7 kinds, but in Scala, these 7 types of values are classes, in Java, the basic type, Java, Data types are divided into basic types and reference types, which are not differentiated in Scala.2. The type of a variable or function in Scala