下面的代码片段是一个简单的例子来定义所有上述集合类型: // Define List of integers.val x=List(1,2,3,4)// Define a set.varx=Set(1,3,5,7)// Define a map.val x=Map("one"->1,"two"->2,"three"->3)// Create a tuple of two elements.val x=(10,"Scala")// Define an optionv...
valscores:scala.collection.mutable.Map[String, Int]=newjava.util.TreeMap[String, Int] 除此之外,你还能够得到从java.util.Properties到Map[String。String]的转换: import scala.collection.JavaConversions.propertiesAsScalaMap valprops:Scala.collection.Map[String, String] = System.getProperties() Scala到Jav...
// Define a map.键/值对 val x = Map("one " -> 1, "two " -> 2, "three" -> 3) val colors = Map("red" -> "#FF0000", "azure" -> "#F0FFFF") // Create a tuple of two elements.元组可以容纳不同类型的对象 val x = (10, "Scala") val t = (1, "hello", Console) ...
By default the maps are immutable, to use the mutable maps you have to use scala.collection.mutable.Map class. Creating a Scala MapThere are different syntax to define mutable and immutable Scala maps,SyntaxSyntax for creating immutable maps:...
最灵活的变体是以一个Config对象为参数,你可以使用ConfigFactory中的任何方法加载。例如,你可以在代码中使用ConfigFactory.parseString()处理一个配置字符串,或者你可以使用ConfigFactory.parseMap()创建一个映射,或者也可以加载一个文件。 你也可以将自定义的配置与通常的配置组合起来,像这样: ...
▲图1. 法雷奥的激光雷达概览 从2010年奥迪A8开始，之后还有本田和奔驰的车型，两代规格在于：● 电云...
A collection in package scala.collection can be either mutable or immutable. For instance, collection.IndexedSeq[T] is a superclass of both collection.immutable.IndexedSeq[T] and collection.mutable.IndexedSeq[T] Generally, the root collections in package scala.collection define the same interface ...
// define the case classcaseclassRegister(user:User)// create a new case class messagevalmessage=Register(user) 发送消息 向actor发送消息需使用下列方法之一。 !意思是“fire-and-forget”,即异步发送一个消息并立即返回。也称为tell。 ?异步发送一条消息并返回一个Future代表一个可能的回应。也称为ask。
We define a context function simply by specifying its type and body, just as we’d do with a “regular” function. The Int ?=> Int notation is a shortcut for ContextFunction1[Int, Int], as much as Int => Int is syntactic sugar for Function1[Int, Int]. For context functions, howe...
First you need to import anorm.SqlParser._Getting a single resultFirst you need a RowParser, i.e. a parser able to parse one row to a Scala value. For example we can define a parser to transform a single column result set row, to a Scala Long:val rowParser = scalar[Long]Then...