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A concise course in Scala Directory Variable declaration Function Package Package Data String Control process Pattern matching Object-oriented Generic type Annotations Implicit Empty Object Nil,null,null,unit,nothing,none Scala is a multiple-paradigm (MULTI-PARADIGM) programming language. Scala source code is compiled into Java bytecode, so it can run on top
Class and constructors:The class is defined as follows: Class MyClass (A:int, b:int) { println (a.tostring) } In Scala, classes can also have class parameters, class parameters can be used directly in the body of the class, there is no need to define a field and then assign the constructor parameters to the field, but it should be noted that: the class parameter is just a parameter, not a field, if you need to use elsewhere, you must define the f
A method can appear as part of an expression (call a function and pass a parameter), but the method (with the parameter method) cannot be the final expression,But the function can appear as the final expression:Scala>//Define a methodScala> def m (x:int) = 2*xM: (x:int) IntScala>//define a functionScala> val f = (x:int) = 2*xF:int = Int = Scala>//method cannot appear as a final expressionScala> mFollow this method with ' _ ' If you want to treat it as
ObjectiveFirst of all, we want to emphasize one important thing at the outset: Scala's pattern matching occurs but is not limited to the match case statement block, which is one of the key factors that Scala pattern matching is important and useful! We will discuss this in detail in the latter part of the article.Types of pattern matchingThere are several types of pattern matching in Scala: Wildcar
Knowledge Points: 1. Simple class and no parameter method class Counter { private// must initialize field // method default is public def Current () = value}In Scala, a class does not declare that a Public,scala source file can contain multiple classes, all of which have common visibility. New // or New Counter () mycounter.increment () println (Mycounter.current ())Call the no parameter method, you c
1. Pattern matching is much more powerful than switch case in Java, in addition to matching values, types, collections, and so on, the most common case class matches, and Master.scala has a large number of pattern matches.Case "_" means an experience that does not satisfy all of the above scenarios, for example:def bigdata (data:string) {Data match{Case "Spack" =>PRINTLN ("WOW!!!")Case "Hadoop" =>println ("OK")Case _=>println ("sorry")}}Bigdata ("spack")//WOW!!!You can add conditional judgment t
1. Install JDK 2. Install Scala Download the scala program at http://scala-lang.org/ Wget http://scala-lang.org/files/archive/scala-2.10.4.tgz Tar-zxvf scala-2.10.4.tgz-C/OPT Ln-S/opt/sca
in Scala. Apply method has different meanings, and for a function This method means invoking the function itself, the following excerpt from programming in Scala, 3rd Edition Every function value is a instance of some class that extends one of the several functionn traits in the package Scala, such as F Unction0 for functions with no parameters, Function
Refer to Scala Installation: http://www.lupaworld.com/thread-970271-1-1.html The following command installs the default Scala version sudo apt-get install Scala If you want to install a specific version, follow these steps: 1) Download Scala compression packwget http://downloads.typesafe.com
All the operators in Scala are calls to methods, for example: 1+2, equivalent to (1). + (2)0 to 5, equivalent to (0). to (5), X (1) = "Scala", equivalent to (x). Update (1, "Scala"), X (1) is equivalent to (x). Apply (1) Scala separates static members by defining the associated object, similar to the static keyword
Java™ developers can use objects as a starting point for understanding Scala. This is the second phase of the Scala Guide series for Java developers, and the author Ted Neward follows the basic premise of evaluating a language: the power of a language can be measured directly by its ability to integrate new functionality, which in this article refers to support for complex numbers. Following this article, y
1.Intellij Idea Configuring the Scala development environment Fix plugin Scala is not installed:no route to hostPlugin Scala wasn't installed:connect timed outPlugin Scala is not installed:cannot download ' http://plugins.jetbrains.com/files/1347/27110/ Scala-intellij-bin-2
Label:Debugging Java code in the Linux/C + + code is required through GDB. Then you need to use the Jdb tool. The use of jdb on the internet can be found in the corresponding article, but the Scala debugging is relatively small. In fact, the general process of debugging is the same, just need to pay attention to some of the details of the place to be. Here's a quick explanation. Here are the questions about Scala
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
OverviewTo put it simply, implicit conversions are: When the Scala compiler does type matching, if no suitable candidate is found, implicit conversions provides another way to tell the compiler how to convert the current type to the expected type. This article source: http://blog.csdn.net/bluishglc/article/details/50866314 prohibited any form of reprint, or will entrust CSDN official maintenance rights!There are four common usage scenarios for implici
map4. Sorted MappingsAn immutable tree map is obtained as follows: Val scores4 = Scala.collection.immutable.SortedMap ("Alice", "Bob", 7, "Cindy", 9)For variable tree mappings, the closest option is to use Java's treemap.If all keys are accessed in the order in which they are inserted, Linkedhashmap is used. Val months = Scala.collection.mutable.LinkedHashMap ("January", 1, "February", "2", "March", 3, "April", 4, 5,...)5. Interoperability with JavaTranslating Java mappings into a
Scala as a functional programming language, to the students accustomed to the instruction programming language, will not be used to, here in addition to the way of thinking, there are grammatical aspects, such as underscore (underline) will appear in a variety of occasions, so that beginners are quite puzzled, today to summarize the next Scala The usage of the underline.1. Type of existence: Existentialtype
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