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Definition of a train - to be shared between all railway applications
this example from a Well House Consultants training course
Source code: trainclass4.rb Module: R102
# Definition of a train - to be shared between all railway applications
class Transport @@owmany = 0 def initialize (origin, length, stockType, time = nil) @origin = origin @mylength = length # @ => variable within the current (train) object @mystock = stockType @time = time @@owmany += 1 end def getstart return @origin end def strengthen (extra) @mylength = @mylength + extra end def gettime return @time end def Transport.getcount # Static method - let Ruby know! return @@owmany end # "Badgerline\t07:15\tBowerhill\t66" Sample data def Transport.factory(instring) pieces = instring.split("\t") makes = nil if ["Badgerline","Faresaver","Bodmans"].include?(pieces[0]) makes = Bus.new pieces[2],1,"unknown",pieces[1] elsif ["FGW","SWT"].include?(pieces[0]) makes = Train.new pieces[2] # etc - line to be completed else puts "Error Handling code goes here" end return makes end end class Train < Transport def getseats return @mylength * 73 # @ - so the variable within the current (train) object end def getdrivers return 1 end end class Bus < Transport def getseats return @mylength * 61 end def getdrivers return @mylength end def to_s return "It's a bus! ... leaves at #{@time}" end end if $0 == __FILE__ # If I am being run as a standalone program ... puts "This is the Train class, and it's my copyright ;-)" puts "This is a file of classes to be loaded by other program and not run alone" # Could put test and demonstration code here! end #* Sample Output #* #* WomanWithCat:r102 grahamellis$ ruby trainclass4.rb #* This is the Train class, and it's my copyright ;-) #* This is a file of classes to be loaded by other program and not run alone #* WomanWithCat:r102 grahamellis$ Learn about this subject
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