ruby private and protected

ruby_private_and_protected.rb

class C1
  def method
    protected_method
    self.protected_method
    C1.new.protected_method

    private_method
    self.private_method rescue puts "ERROR self.private_method #{self.class.name}"
    C1.new.private_method rescue puts "ERROR C1.new.private_method #{self.class.name}"
  end

  protected
  def protected_method
    puts "#{self.class.name} protected_method"
  end

  private
  def private_method
    puts "#{self.class.name} private method"
  end
end

class C2 < C1
  def method
    protected_method
    self.protected_method
    C1.new.protected_method
    C2.new.protected_method

    private_method
    self.private_method rescue puts 'ERROR self.private_method'
    C1.new.private_method rescue puts 'ERROR C1.new.private_method'
    C2.new.private_method rescue puts 'ERROR C2.new.private_method'
  end
end

c1 = C1.new
puts '----- c1.method -----'
c1.method
puts '----- c1.protected_method -----'
c1.protected_method rescue puts 'ERROR c1.protected_method'
puts '----- c1.private_method -----'
c1.private_method rescue puts 'ERROR c1.private_method'

c2 = C2.new
puts '----- c2.method -----'
c2.method
puts '----- c2.protected_method -----'
c2.protected_method rescue puts 'ERROR c2.protected_method'
puts '----- c2.private_method -----'
c2.private_method rescue puts 'ERROR c2.private_method'

----- c1.method -----
C1 protected_method
C1 protected_method
C1 protected_method
C1 private method
ERROR self.private_method C1
ERROR C1.new.private_method C1
----- c1.protected_method -----
ERROR c1.protected_method
----- c1.private_method -----
ERROR c1.private_method
----- c2.method -----
C2 protected_method
C2 protected_method
C1 protected_method
C2 protected_method
C2 private method
ERROR self.private_method
ERROR C1.new.private_method
ERROR C2.new.private_method
----- c2.protected_method -----
ERROR c2.protected_method
----- c2.private_method -----
ERROR c2.private_method

Point: https://gist.github.com/2get/c081466ce225a419d0a1#file-ruby_private_and_protected-rb-L27-L28