Ruby入門 オブジェクト指向

class Human
 def initialize
  @name = "Masa"
 end
 def talk
  print "My name is ", @name, "\n"
 end
end

masa = Human.new
masa.talk

#メソッドだけ
def talk(name)
 print "My name is ", name, "\n"
end

talk "Masa"
talk "Konno"

class Human
 def initialize(item)
  @name=item
 end
 def talk
  print "My name is ", @name, "\n"
 end
end

masa  = Human.new("Masa")
konno = Human.new("Konno");

masa.talk
konno.talk

class Human
 def initialize(item)
  @name=item
 end
 def talk
  print "My name is ", @name, "\n"
 end
 def rename(val)
  @name=val
 end
end

masa = Human.new("Masa")
konno = Human.new("Konno")

masa.talk
konno.talk

masa.rename("Takeshi")
masa.talk

class Human
 def initialize(item)
  @name=item
 end
 def talk
  print "My name is ", @name, "\n"
 end

 attr_accessor: name

end

masa = Human.new("Masa")
konno = Human.new("Konno")

masa.talk
konno.talk

masa.name="Takeshi"

masa.talk

print masa.name

class Human
 def initialize(item)
  @age
  @name=item
 end
 def talk
  print "My name is ", @name, "\n"
  print "I am ", @age," years old\n"
 end
 attr_accessor:name
 :age
end

masa = Human.new("Masa")
masa.age = 20
masa.talk

class Human
 def initialize(item)
  @name=item
 end
 def talk
  print "My name is ", @name, "\n"
 end
end


class Japanese < Human
 def hello
  print "私の名前は ", @name, " です\n"
 end
end

masa = Japanese.new("Masa")
masa.talk
masa.hello

class Human
 def initialize(item)
  @name=item
 end
 def talk
  print "My name is ", @name, "\n"
 end
end

class Japanese < Human
 def talk
  print "私の名前は ", @name, " です\n"
 end
end

masa = Japanese.new("Masa")
masa.talk

class NewArray < Array
	def sum		# 合計値の計算
		self.inject(0.0){|result, item| result + item}
	end
	def ave		# 平均値の計算
		self.length/sum
	end
end

a = NewArray.new
a << 1 << 2 << 3 << 4 << 5
p a
p a.sum
p a.ave

class Human 
 def initialize(item)
  @name=item
 end
 def talk
  print "My name is ", @name, "\n"
 end
end

class Japanese < Human
 def talk
  print "私の名前は ", @name," です\n"
  live
 end
end

def whoareyou(who)
 who.talk
end

nancy = Human.new("Nancy")
masa = Japanese.new("Masa")

whoareyou nancy
whoareyou masa

class Human 
 def initialize(item)
  @name=item
 end
 def talk
  print "My name is ", @name,"\n"
 end
end

class Japanese < Human
 def talk
  print "私の名前は ", @name, " です\n"
end


member = []
member << Human.new("Nancy")
member << Japanese.new("Masa")
member << Japanese.new("Konno")

member.each do |who|
 who.talk
end

class Human
 def initialize(name, nationality)
  @name=name
  @nationality=nationality
 end
 attr_reader :nationality

 def talk_english
  print "My name is ", @name, "\n"
 end
 def talk_japanese
  print "私の名前は ", @name, " です\n"
 end
end


member = []
member << Human.new("Nancy", "American")
member << Human.new("Masa", "Japanese")
member << Human.new("Konno", "Japanese")

member.each do |who|
 if who.nationality == "American"
  who.talk_english
 elsif who.nationality == "Japanese"
  who.talk_japanese
 end
end