scala table

This is a creation in Article, where the information may have evolved or changed. Format conversion Classes category Python Java Scala Go Excel XLWT/XLRD, Xlsxwriter Poi - - Pdf PyPDF2 Apache FOP - - Csv Csvkit, Tablib - - - XML parsing Beautifulsoup/bs4 - - - Json - Jackson Json4s, Spr

:array[int] = Array (1, 2, 3, 4, 5, 7, one) Scala> val buffer=a1.tobuffer Buffer:scala.collection.mutable.buffer[int] = Arraybuffer (1, 2, 3, 4, 5, 7, 11, 13, scala>) Note: + = To add elements at the end of the Arraybuffer, wrap them in parentheses when adding multiple elements ++= indicates that any collection toarray is appended to the Arraybuffer to array Toarraybuffer represents the conversion of ar

Table. Map[string,string] = Map (A3, a3a, A4-a4a) scala> val d = C-"A4" d:scala.collection.immutable.map[ String,string] = Map (A3-A3A) When an immutable variable is declared as Var, it is still an immutable map and cannot be re-assigned to the elements in the map. 5. Access to mapped values 1) accesses a separate value saved in the map, and throws an exception if the key does not exist. To avoid this

First, Scala overviewcan expand? Object Oriented? function-type programming compatible with Java Interop Syntax concise ? code line short ? ? abstract control statically typed can examine secure refactoring support concurrency control Customize other control structures Ii. installation of ScalaIdeEclipse (native support, use more complex)IntelliJ (expensive)NetBeans

Numeric type of 1.ScalaScala's numeric types are similar to Java's, and their scope is consistent with Java. Unlike Java, they are objects and are instances of the corresponding numeric classes. Scala provides powerful support for these numeric types through rich-Wrapper classes.1.1. Numeric typeScala's numeric type and range of values are shown in the table below. Boolean:true or False Byte:8

. The Scala compiler collects these two class parameters and createsMaster constructor:Primary Constructor. Balance between immutable objects Immutable objects provide several advantages over mutable objects and a potential disadvantage..FirstImmutable objects are often more logical than mutable objects because they do not have a complex state space that changes over time.Second, You can freely pass immutable objects, but you may need to build a c

Tags: nbsp idea Big Data development GTK Target 1.3 website startup technology sharingStep Two: Install IntelliJ idea　If 3 nodes such as Master, Slave1, Slave2, it is recommended to install it on the master nodeTo Https://www.jetbrains.com/idea download the corresponding version of the file,Because, I usually install the JDK myself, without the openjdk of CentOS, so I download the version as followsThen unzip it.The following is the directory where IntelliJ idea was installedThen proceed to the

Scala tutorial, scala Programming The following is a complete scala getting started tutorial I have collected from the Internet. I have followed other programming basics to get started. Compared with other languages such as Java, Scala is a complex language. It is a unity of object-oriented and function-oriented. It is

definition Package Scala uses the Package keyword to define packages, and in Scala there are two ways to define code into a package: The first method: Package Com.idoshare.scala The second method:Package com.idoshare{ class test{ } } 9. references Scala uses the Import keyword to refer to a package. For example: Import scala.io.Source import scal

Scala supports scripts 1) create a file hello. Scala under/opt/Scala-script and edit the file as follows: $ Hello, this is the first Scala script 2) run the script 　　　　 The command line parameters of the scala script are saved in the sc