What happens to existing behavior if older version object still exists

open_class_overwrite_when_old_object_case.rb

# What happens to existing behavior if older version object still exists
class MyClass
  def print
    puts 'This is still old behavior'
  end
end

old_class = MyClass.new

# Modifying the original blue print or prototype
class MyClass
  def print
    puts 'Modified behavior'
  end
end

new_class = MyClass.new

old_class.print
# => Modified behavior
new_class.print
# => Modified behavior