Ruby中的Object :: private和Object :: public是什么？

class MyClass
  private
  def my_private_method
    puts "This is a private method."
  end
end

my_object = MyClass.new
my_object.private_methods.each do |method|
  puts method
end

my_private_method

class MyClass
  def my_public_method
    puts "This is a public method."
  end
end

my_object = MyClass.new
my_object.public_methods.each do |method|
  puts method
end

my_public_method