ruby学習メモ アクセス制御

class TestClass
  def defaultMethod # public
    return "default -> public"
  end
  protected
  def protectedMethod # protected
    return "protected"
  end

  private
  def privateMethod # private
    return "private"
  end

  public
  def publicMethod # public
    return "public"
  end

  def callOtherProtectedMethod(other)
    return other.protectedMethod
  end
  def callOtherPrivateMethod(other)
    return other.privateMethod
  end
  
end

irb(main):472:0* test1 = TestClass.new
=> #<TestClass:0x297aa20>
irb(main):473:0> test1.defaultMethod
=> "default -> public"
irb(main):474:0> test1.protectedMethod
NoMethodError: protected method `protectedMethod' called for #<TestClass:0x297aa20>
        from (irb):474
        from ^C:0
irb(main):475:0> test1.privateMethod
NoMethodError: private method `privateMethod' called for #<TestClass:0x297aa20>
        from (irb):475
        from ^C:0
irb(main):476:0> test1.publicMethod
=> "public"
irb(main):477:0>
irb(main):478:0* test1.callOtherProtectedMethod(test1)
=> "protected"
irb(main):479:0> test1.callOtherPrivateMethod(test1)
NoMethodError: private method `privateMethod' called for #<TestClass:0x297aa20>
        from (irb):450:in `callOtherPrivateMethod'
        from (irb):479
        from ^C:0

上記の callOtherPrivateMethod のように同一クラス、他インスタンスの private メソッドの呼び出しが許可されない。
java の場合は許可される。
java に対して同一クラスでのアクセス許可という点でアクセス制御の方法が若干違う模様