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This declaration corresponds to the Java class declaration:
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public class Foo { }
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If the constructor or method takes zero parameters, you can omit the parameter list. To create an instance of Foo, you can type the following:
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new Foo
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But, this works just as well:
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new Foo()
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To define the Bar class that takes a single constructor parameter, name, which is a String:
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class Bar(name: String)
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To create an instance of Bar:
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new Bar("Working...")
4. The declaration of Scala classes is syntactically more lightweight than Java s declarations. Classes with constructors, properties, and so on can be declared in a single line of code. Classes in Scala are often used to enforce type safety. For example, you might return an instance of Name rather than String. As we explore more about Scala, you ll see why Scala programs often group many class definitions into a single source file.
CHAPTER 2 SCALA SYNTAX, SCRIPTS, AND YOUR FIRST SCALA PROGRAMS
To define Baz with a constructor that tests name and throws an exception if name is null:
class Baz(name: String) { // constructor code is inline if (name == null) throw new Exception("Name is null") }
The Java interface defines a set of methods that must be implemented on all classes that implement the interface. Scala supports interfaces but calls them traits. Traits can do everything that interfaces can do, but they can also include method implementations. This comes in very handy because you don t have to create complex class hierarchies in order to avoid duplicating code. You just write the code in the trait, and every class that implements the trait gets those methods. Scala s traits correspond to Ruby s mixins. Let s define the trait Dog:
trait Dog
To add the Dog trait to the Fizz2 class:
class Fizz2(name: String) extends Bar(name) with Dog
To define the Cat trait, which requires that any extending classes implement the meow method:
trait Cat { def meow(): String }
To define the FuzzyCat trait that extends Cat and implements the meow method:
trait FuzzyCat extends Cat { override def meow(): String = "Meeeeeeow" }
To define the OtherThing trait with the hello method:
trait OtherThing { def hello() = 4 }
And to define the Yep class that extends FuzzyCat and OtherThing:
class Yep extends FuzzyCat with OtherThing
CHAPTER 2 SCALA SYNTAX, SCRIPTS, AND YOUR FIRST SCALA PROGRAMS
Using the REPL, let s see what happens when we call the meow and hello methods on a Yep instance:
scala> (new Yep).meow()
res36: String = Meeeeeeow
scala> (new Yep).hello()
res79: Int = 4
Scala does not allow you to declare static methods or variables, but it does support an alternative model for singletons called objects. If you declare something as an object, only one instance of it exists in the scope in which it was declared. An object will be instantiated the first time it is accessed. A Scala object can exist at the package scope, and it replaces Java s static methods and variables. The advantage of Scala s object over Java s static mechanism is that a Scala object is an instance of a class and can be passed as a parameter to methods. You declare a singleton object with the object keyword instead of the class or trait keyword:
object Simple
You can include methods in an object:
object OneMethod { def myMethod() = "Only One" }
and extend classes and traits:
object Dude extends Yep
and override methods:
object Dude2 extends Yep { override def meow() = "Dude looks like a cat" }
CHAPTER 2 SCALA SYNTAX, SCRIPTS, AND YOUR FIRST SCALA PROGRAMS
and add new methods:
object OtherDude extends Yep { def twoMeows(otherparam: Yep) = meow + ", " + param.meow }
Let s access our objects and show how the Dude and Dude2 objects can be passed into a method that takes a Yep as a parameter:
scala> OtherDude.meow
res39: String = Meeeeeeow
scala> OtherDude.twoMeows(Dude)
res40: java.lang.String = Meeeeeeow, Meeeeeeow
scala> OtherDude.twoMeows(Dude2)
res80: java.lang.String = Meeeeeeow, Dude looks like a cat
The previous example demonstrates that the meow method is invoked on the Dude object and the Dude2 object. The objects were passed as a parameter into the twoMeows method just like any other instance. You can embed an object in a class, trait, or object. One instance of the object is created for each instance of the enclosing scope. Thus, each HasYep instance will have a single myYep that will be created when it is accessed:
class HasYep { object myYep extends Yep { override def meow = "Moof" } } scala> (new HasYep).myYep.meow
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