scala in action

The main contents of this section Scala class Hierarchy Overview How to implement the native type of Scala Nothing, NULL type resolution Traits Introduction Traits several different ways to use 1 Scala class hierarchiesThe class hierarchy chart in Scala is as follows:Source: Programming in

1.If statementsScala's If statement can complete the IF statement in other languages, at the same time, if/else usually has values that can be used to assign values, or instead of the ternary conditional operator (?:). However, it can be more powerful than the conditional operator because you can write very complex blocks in If-else.1.1. Common IF statements package com.tv189.foundation Span style= "color: #008000;" >/** * Created by Molyeo on 2015/7/30. */ object ifcondition {def main (ar

Install Scala and Scala IDE in Ubuntu 16.04 and Windows1. Download 1.1Scala Http://www.scala-lang.org/download/ for Windows Http://www.scala-lang.org/download/2.11.8.html (Linux) Below: Download 1.2ScalaIDE : Http://scala-ide.org/download/sdk.html 2. Install Scala in Windows Environment: Windows10 + JDK1.7 + Scala2.11

[TOC] Array fixed-length arraysIf you need an array of the same length, you can use the arrays in Scala. For example:val numsArray = new Array[Int] (30) //长度为30的整数数组，所有元素初始化为0val stringArrays = new Array [String] (30) //长度为30的字符串数组，所有元素初始化为nullval sHello = Array("Hello", "World") //长度为2的Array[String]类型是推断出来的，已提供初始值就不需要newsHello(0) = "Hello Tom",使用()而不是[]来访问元素In the JVM, Scala's array is implemented as a Java array. The array in the example is of

SCALA Study Notes (1), SCALA Study Notes (Variable When obtaining the variable value is time-consuming, you can use lazy var.Lazy val forLater = someTimeConsumingOperation () Scala> val first: rest = List (1, 2, 3)First: Int = 1Rest: List [Int] = List (2, 3)Function Definition "=" Is not just used to separate the function signature and function body. It also ser

In the previous article we described how to install Scala and how to configure environment variables Next we'll explain how to use the interpreter to write simple Scala code Open the console and enter Scala development mode: bokee@debian70:~$ Scala Welcome to Scala version

Welcome to visit This journey contains a few streamlined introductions: the most common features of Scala are presented. It is designed to help beginners learn the language. This is just a brief introduction, not a complete language tutorial. If you can, consider buying a book or reviewing other resources. What is Scala? Scala is a modern, multi-paradigm programm

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--"

Build a scala environment in linux and write a simple scala Program (Code tutorial), linuxscala Installing the scala environment in linux is very simple. If it is a ubuntu environment, it will be simpler. You can directly use apt-get to solve the problem. I just use ubuntu. java/scala systems must be based on jdk, so

Scala Development Environment BuildingLet's start with some of the reasons why I study Scala: The JVM's dominance in the enterprise, Scala is also the language on the JVM, and it is likely that the future will be too much from Java to Scala. Advanced functional programming and object-oriented integration.

Scala details --------- installation and configuration problems, scala ---------Install Scala 2.11 In Win7 1. Download Scala 2.11Http://download.csdn.net/download/u014393736/7107595 The Scala Installation File I downloaded is actually a compressed package. You only need to d

I haven't been to Scala official website for a long time. I accidentally opened the browser bookmarks tonight and found the article "Scala-Teaching O-O" on the home page, and the Updated is just Updated yesterday: 2010-10-18 ,), And the title is quite attractive. Yann, Assistant Professor in Paris, chose Scala and Simply

First, Scala is the combination of functional programming and object-oriented programming language, what are the characteristics of these two programming? A: Functional programming excels at numerical calculations, and object-oriented programming is particularly well suited for large engineering or project organizations, and for team collaboration.Second, Scala the characteristicsScala elegant structure, so

with the main () method, which is the mandatory entry section of each Scala program. Scala modifier: All Scala components require a name. Using objects, classes, variables, and method names is called an identifier. Keywords cannot be used as identifiers and identities to be case-sensitive. Scala supports the following

Why do you write this blog?First of all, for the Spark project, it is highly recommended to build, with IntelliJ idea (Ultimate version), if you have another hobby to try Scala ideas for Eclipse, have time to play for yourself. But it's best to follow the crowd.For Hadoop projects, Eclipse is strongly recommended.Second, out of a Bo friends to give me the need to leave a message, in order to more efficient and high-quality help everyone, comb write do

Class level for 1.ScalaThe top of the class in Scala is any class that inherits any classes, and any includes the following common methods:Final def == =(That:any): Boolean def equals (That:any): Boolean def hashcode:int def tostring:string2 operator overloads, one Equals method, one Hashcode method and one tostring method.Root class any has two sub-classes: Anyval and AnyrefAnyval is the parent of a value type, and Anyref is the parent class of the r

On this page, we'll cover the basics of Scala. Try Scala in the browser You can run Scala from the Scalafiddle in the browser. Open Https://scalafiddle.io In the left pane, pasteprintln("Hello, world!") Click the "Run" button. The output is displayed in the right pane. This is a simple, 0-setting way to test