如何从Rails中的其他类获取值

class MyClass
  def initialize
    @value = "Hello"
  end

  def get_value
    @value
  end
end

class OtherClass
  def print_value
    my_class = MyClass.new
    puts my_class.get_value
  end
end

class MyClass
  def self.get_value
    "Hello"
  end
end

class OtherClass
  def print_value
    puts MyClass.get_value
  end
end

class MyClass
  def initialize(value)
    @value = value
  end

  def get_value
    @value
  end
end

class OtherClass
  def print_value(my_class)
    puts my_class.get_value
  end
end

my_class = MyClass.new("Hello")
other_class = OtherClass.new
other_class.print_value(my_class)