From: Robert Dober <robert.dober@...>
Date: 2007-07-29T16:35:24+09:00
Subject: Re: how can i use a ruby class in object way

On 7/29/07, Guo Yangguang <gyg22@163.com> wrote:
> thank you very much!Your answer make me understand more about object in
> ruby.I am very glad.But still ,i have another question.Please read an
> example following:
> class Test
> def initialize
> e="e"
> end
> def Test.say_hello
> puts "Hello from #{self.name}"
> puts "hello from #{self.class}"
> end
> say_hello
> end
>
It is not completely clear what you want to achieve but some remarks
might be helpful

class Test
   def initialize
      e="e" # this code is not realy useful, e is a scope local
variable that will be thrown away, you probably want to do this:
      @e = "e" # this is an instance variable
   end

   attr_accessor :e  # for some tests below

   def Test.say_hello
     ...
   end
   say_hello
end

Test.say_hello
aTest = Test.new
puts aTest.e
aTest.e = 42
puts aTest.e

>
>
>
> FireAphis wrote:
> > On Jul 26, 6:43 am, Guo Yangguang <gy...@163.com> wrote:
> >> --
> >> Posted viahttp://www.ruby-forum.com/.
> >
> > I hope I understand your question correctly.
> >
> > Ruby is in its essence an interpreter. When you type in your command
> > prompt
> >
> >>ruby my_script.rb
> >
> > the interpreter (that by itself is just another application) reads
> > your file line by line and executes every line. Think of every line in
> > Ruby as a command to the interpreter and that the interpreter executes
> > every single line. That means you can use your classes anywhere you
> > like as long as they were defined before. For example, this is
> > absolutely correct in Ruby:
> >
> > a = "I assign even before any declaration"
> > puts "Moreover I can output its value #{a}"
> >
> > (1..10).each {|x| puts "#{x} I can do anything I wish"}
> >
> > class C1
> >    puts "When interpreter will read this he will print. Not very
> > useful but possible"
> >    def a()
> >    end
> > end
> >
> > c = C1.new # now we can use our class
> > puts "We can do something in between..."
> >
> > class C2
> >    puts "We can define another class"
> >    def b
> >    end
> > end
> >
> > puts "And so on..."
> >
> >
> > As you can see it's quite different from Java. If you want to feel
> > more comfortable think of your Ruby code written entirely inside one
> > big 'main' Java function. Just remember - every line is executed!
> >
> > FireAphis
>
> --
> Posted via http://www.ruby-forum.com/.
>
>


-- 
[...] as simple as possible, but no simpler.
-- Attributed to Albert Einstein