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c# barcode generator library open source class Foo in Font
class Foo Make Data Matrix In None Using Barcode creator for Font Control to generate, create DataMatrix image in Font applications. www.OnBarcode.comPrinting Quick Response Code In None Using Barcode printer for Font Control to generate, create QR Code 2d barcode image in Font applications. www.OnBarcode.comThis declaration corresponds to the Java class declaration: UCC.EAN - 128 Encoder In None Using Barcode creator for Font Control to generate, create GS1-128 image in Font applications. www.OnBarcode.comPainting UPC-A Supplement 2 In None Using Barcode generation for Font Control to generate, create GS1 - 12 image in Font applications. www.OnBarcode.compublic class Foo { } Code39 Printer In None Using Barcode creator for Font Control to generate, create Code 3/9 image in Font applications. www.OnBarcode.comMaking GS1 - 13 In None Using Barcode creator for Font Control to generate, create GS1 - 13 image in Font applications. www.OnBarcode.comIf the constructor or method takes zero parameters, you can omit the parameter list. To create an instance of Foo, you can type the following: Barcode Creator In None Using Barcode creator for Font Control to generate, create Barcode image in Font applications. www.OnBarcode.comPrinting Postnet 3 Of 5 In None Using Barcode creator for Font Control to generate, create Postnet 3 of 5 image in Font applications. www.OnBarcode.comnew Foo
DataMatrix Decoder In Visual C# Using Barcode recognizer for .NET Control to read, scan read, scan image in .NET applications. www.OnBarcode.comCreating Data Matrix 2d Barcode In Java Using Barcode maker for BIRT reports Control to generate, create Data Matrix ECC200 image in BIRT applications. www.OnBarcode.comBut, this works just as well: EAN-13 Supplement 5 Decoder In None Using Barcode reader for Software Control to read, scan read, scan image in Software applications. www.OnBarcode.comEuropean Article Number 13 Decoder In Visual C# Using Barcode scanner for VS .NET Control to read, scan read, scan image in .NET framework applications. www.OnBarcode.comnew Foo() Making EAN / UCC - 13 In None Using Barcode drawer for Software Control to generate, create EAN13 image in Software applications. www.OnBarcode.comANSI/AIM Code 128 Printer In Objective-C Using Barcode drawer for iPhone Control to generate, create Code 128A image in iPhone applications. www.OnBarcode.comTo define the Bar class that takes a single constructor parameter, name, which is a String: Recognizing Code 128 Code Set C In .NET Using Barcode decoder for VS .NET Control to read, scan read, scan image in .NET framework applications. www.OnBarcode.comQR Code Decoder In VB.NET Using Barcode scanner for VS .NET Control to read, scan read, scan image in .NET framework applications. www.OnBarcode.comclass Bar(name: String) Print ECC200 In None Using Barcode printer for Microsoft Excel Control to generate, create Data Matrix 2d barcode image in Excel applications. www.OnBarcode.comBarcode Creator In None Using Barcode generator for Software Control to generate, create Barcode image in Software applications. www.OnBarcode.comTo create an instance of Bar: Code 3/9 Drawer In Java Using Barcode creation for Eclipse BIRT Control to generate, create ANSI/AIM Code 39 image in Eclipse BIRT applications. www.OnBarcode.comPDF 417 Creator In None Using Barcode generator for Software Control to generate, create PDF 417 image in Software applications. www.OnBarcode.comnew 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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