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The following defines the input variable:
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val input = Source.fromInputStream(System.in)
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Its type is Source, a source of input, which wraps the JVM s System.in InputStream. In this case, we didn t have to do anything fancy to access a Java class. We used it just as we might have from a Java program. This illustrates the awesome interoperability between Scala and Java. The next line gets the lines from our source and collects them into a Seq[String]:
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val lines = input.getLines.collect
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CHAPTER 2 SCALA SYNTAX, SCRIPTS, AND YOUR FIRST SCALA PROGRAMS
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Finally, we print a message on the console with the sum of the lines with parsible integers on them:
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println("Sum "+sum(lines))
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To run the program, type
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> scala Sum.scala
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When you re prompted, enter some lines with numbers. When you re done, press Ctrl-D (Unix/Linux/Mac OS X) or Ctrl-C (Windows), and the program will display the sum of the numbers. Great, you ve written a Scala program that makes use of many of Scala s features including function passing, immutable data structures, and type inference. Now, let s look more deeply into Scala s syntax.
Basic Scala Syntax
Scala, like Java, is a C-derivative language, and many familiar C syntactic constructs are visible in Scala. The biggest syntactic difference between Scala and Java is that the ; line end character is optional. There are other differences, but they should be pretty understandable and self-explanatory. In this section, I ll review the parts of Scala s syntax that you ll need for the rest of the book. The complete Scala syntax and language definition can be found in the Scala Language Specification (http://www.scala-lang.org/sites/default/files/linuxsoft_archives/docu/ files/ScalaReference.pdf).
Number, String, and XML Constants
Scala has all the same constants as Java, with the same memory footprint and precision. Integer: 1, 882, -1 Boolean: true, false Double: 1.0, 1d, 1e3 Long: 42L Float: 78.9f Characters: '4', ' ', 'z' Strings: "Hello World"
CHAPTER 2 SCALA SYNTAX, SCRIPTS, AND YOUR FIRST SCALA PROGRAMS
Scala also supports multilined Strings that start and end with triple quotes:
"""Hello Multiline World"""
Scala supports XML constants, including embedded Scala code. We ll explore this more in 3.
<b>Foo</b> <ul>{(1 to 3).map(i => <li>{i}</li>)}</ul>
package
A package is a named module of code. Java and Scala convention dictates that package names are the reversed domain name of the code owner. For example, the packages in the Lift Web Framework (http://liftweb.net) begin with net.liftweb. Typically, the package also contains a descriptive name for the module. For example, the Lift utility package is net.liftweb.util. The package declaration is the first non-comment line in the source file:
package com.liftcode.stuff
import
Scala packages can be imported so that they can be referenced in the current compilation scope. The following statement imports the contents of the scala.xml package:
import scala.xml._
Import statements are made in the scope of prior imports. The following statement imports the scala.xml.transform package:
import transform._
You can import a single class and object (more on objects very soon), for example,
HashMap from the scala.collection.mutable package: import scala.collection.mutable.HashMap
You can import more than one class or object from a single package, for example,
TreeMap and TreeSet from the scala.collection.immutable package: import scala.collection.immutable.{TreeMap, TreeSet}
CHAPTER 2 SCALA SYNTAX, SCRIPTS, AND YOUR FIRST SCALA PROGRAMS
Finally, you can import a class or object and rename it. For example, you can import the JSON class/object from the scala.util.parsing.json package and rename it to JsonParser:
import scala.util.parsing.json.{JSON => JsonParser}
Class, Trait, and Object Definition
Scala s object model allows you to model any Java class. Everything you can do with a Java class you can do with a Scala class. Scala s class declaration syntax and rules are different from and, in my opinion, more flexible than Java s. It s common to declare far more classes in a Scala program than in a Java program. Scala removes Java s constraint of one public class per file. You can put as many classes in a file as you want, and you can name the file whatever you want. Your IDE will help you navigate from class to file.4 In Scala, everything has public access level unless otherwise declared. You can define the public Foo class that has no methods:
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