A User Class in Java

Drawer Data Matrix in Java A User Class
445 A User Class
Data Matrix 2d Barcode Printer In Java
Using Barcode generation for Java Control to generate, create Data Matrix ECC200 image in Java applications.
We end our tour of Ruby with a complete class of our own, a User class that anticipates the User model coming up in 6 So far we ve entered class definitions at the console, but this quickly becomes tiresome; instead, create the file example_userrb in your Rails root directory and fill it with the contents of Listing 48 (Recall from Section 113 that the Rails root is the root of your application directory; for example, the Rails root for my sample application is /Users/mhartl/rails_projects/sample_app)
Barcode Generator In Java
Using Barcode creation for Java Control to generate, create bar code image in Java applications.
Listing 48 Code for an example user
Scan Bar Code In Java
Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications.
example_userrb
Print Data Matrix ECC200 In Visual C#.NET
Using Barcode creation for .NET Control to generate, create Data Matrix ECC200 image in .NET framework applications.
class User attr_accessor :name, :email def initialize(attributes = {}) @name = attributes[:name] @email = attributes[:email] end def formatted_email "#{@name} <#{@email}>" end end
DataMatrix Encoder In Visual Studio .NET
Using Barcode generation for ASP.NET Control to generate, create ECC200 image in ASP.NET applications.
There s quite a bit going on here, so let s take it step by step The first line,
Painting ECC200 In .NET Framework
Using Barcode drawer for .NET framework Control to generate, create Data Matrix image in .NET framework applications.
attr_accessor :name, :email
Encoding ECC200 In Visual Basic .NET
Using Barcode printer for Visual Studio .NET Control to generate, create ECC200 image in .NET framework applications.
creates attribute accessors corresponding to a user s name and email address This creates getter and setter methods that allow us to retrieve (get) and assign (set) @name and @email instance variables
Generate EAN / UCC - 13 In Java
Using Barcode generation for Java Control to generate, create GTIN - 13 image in Java applications.
Ruby Classes
Print Barcode In Java
Using Barcode generator for Java Control to generate, create bar code image in Java applications.
The first method, initialize, is special in Ruby: it s the method called when we execute Usernew This particular initialize takes one argument, attributes:
USS Code 39 Drawer In Java
Using Barcode generation for Java Control to generate, create Code-39 image in Java applications.
def initialize(attributes = {}) @name = attributes[:name] @email = attributes[:email] end
ECC200 Generation In Java
Using Barcode generation for Java Control to generate, create Data Matrix image in Java applications.
Here the attributes variable has a default value equal to the empty hash, so that we can define a user with no name or email address (recall from Section 433 that hashes return nil for nonexistent keys, so attributes[:name] will be nil if there is no :name key, and similarly for attributes[:email]) Finally, our class defines a method called formatted_email that uses the values of the assigned @name and @email variables to build up a nicely formatted version of the user s email address using string interpolation (Section 422):
Encoding Barcode In Java
Using Barcode generator for Java Control to generate, create barcode image in Java applications.
def formatted_email "#{@name} <#{@email}>" end
Ames Code Generator In Java
Using Barcode drawer for Java Control to generate, create Uniform Symbology Specification Codabar image in Java applications.
Let s fire up the console, require the example user code, and take our User class out for a spin:
Drawing Data Matrix In VB.NET
Using Barcode generator for .NET Control to generate, create Data Matrix 2d barcode image in .NET framework applications.
>> => >> => >> => >> => >> => >> =>
Making Barcode In VS .NET
Using Barcode drawer for ASP.NET Control to generate, create barcode image in ASP.NET applications.
require '/example_user' # This is how you load the example_user code ["User"] example = Usernew #<User:0x224ceec @email=nil, @name=nil> examplename # nil since attributes[:name] is nil nil examplename = "Example User" # Assign a non-nil name "Example User" exampleemail = "user@examplecom" # and a non-nil email address "user@examplecom" exampleformatted_email "Example User <user@examplecom>"
Print Barcode In Visual Studio .NET
Using Barcode printer for .NET Control to generate, create barcode image in .NET framework applications.
Here the is Unix for current directory , and /example_userrb tells Ruby to look for an example user file relative to that location The subsequent code creates an
Making Barcode In Visual Studio .NET
Using Barcode creation for ASP.NET Control to generate, create barcode image in ASP.NET applications.
4: Rails-Flavored Ruby
ANSI/AIM Code 39 Printer In .NET
Using Barcode generator for .NET Control to generate, create USS Code 39 image in VS .NET applications.
empty example user and then fills in the name and email address by assigning directly to the corresponding attributes (assignments made possible by the attr_accessor line in Listing 48) When we write
ANSI/AIM Code 128 Creator In Visual C#.NET
Using Barcode encoder for VS .NET Control to generate, create Code 128C image in VS .NET applications.
examplename = "Example User"
Barcode Printer In .NET Framework
Using Barcode creator for ASP.NET Control to generate, create barcode image in ASP.NET applications.
Ruby is setting the @name variable to "Example User" (and similarly for the email attribute), which we then use in the formatted_email method Recalling from Section 434 we can omit the curly braces for final hash arguments, we can create another user by passing a hash to the initialize method to create a user with pre-defined attributes:
>> => >> =>
user = Usernew(:name => "Michael Hartl", :email => "mhartl@examplecom") #<User:0x225167c @email="mhartl@examplecom", @name="Michael Hartl"> userformatted_email "Michael Hartl <mhartl@examplecom>"
We will see starting in 8 that initializing objects using a hash argument is common in Rails applications
45 Exercises
1 Using Listing 49 as a guide, combine the split, shuffle, and join methods to write a function that shuffles the letters in a given string 2 Using Listing 410 as a guide, add a shuffle method to the String class 3 Create three hashes called person1, person2, and person3, with first and last names under the keys :first and :last Then create a params hash so that params[:father] is person1, params[:mother] is person2, and params[:child] is person3 Verify that, for example, params[:father] [:first] has the right value 4 Find an online version of the Ruby API and read about the Hash method merge