42对象、类及从属关系

## Animal is-a object look at the extra credit
class Animal

	def is_what()
		puts "#{@name} is an animal."
	end
end

## is-a
class Dog < Animal

	def initialize(name)
		## has-a
		@name = name
	end
	
	def is_what()
		puts "#{@name} is a dog."
	end
end

## is-a
class Cat < Animal

	def initialize(name)
		## has-a
		@name = name
	end
end

## is-a
class Person

	def initialize(name)
		## has-a
		@name = name
		
		##Person has-a pet of some kind
		@pet = nil
	end
	
	attr_accessor :pet
end

## is-a
class Employee < Person

	def initialize(name, salary)
		## has-a
		super(name)
		## has-a
		@salary = salary
	end
	
end

## is-a
class Fish
end

## is-a
class Salmon < Fish
end

## is-a
class Halibut < Fish
end


## rover is-a Dog
rover = Dog.new("Rover")

## is-a
satan = Cat.new("Satan")

## is-a
mary = Person.new("Mary")

## has-many
mary.pet = [satan, rover]

rover.is_what
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42对象、类及从属关系

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