output

public
protected
NoMethodError: private method `pri_bar' called for #<Foo:0x007f8376ae2d28>
from (pry):10:in `other_bar'

privacy.rb

class Foo
  public
  def pub_bar
    puts "public"
  end
  
  def other_bar other
    other.pub_bar
    other.pro_bar
    other.pri_bar
  end
  
  protected
  def pro_bar
    puts "protected"
  end
  
  private
  def pri_bar
    puts "private"
  end
end

f1 = Foo.new
f2 = Foo.new

f2.other_bar f1