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本篇的內容主要描述Access Control的實(shí)現：

1）方式一

class MyClass

  def method1                                               # default is ‘public‘

    #...

  end

  protected                                                   # subsequent methods will be ‘protected‘

  def method2                                              # will be ‘protected‘

    #...

  end

  private                                                       # subsequent methods will be ‘private‘

  def method3                                              # will be ‘private‘

    #...

  end

  public                                                         # subsequent methods will be ‘public‘

  def method4                                              # and this will be ‘public‘

    #...

  end

end

2）方式二

class MyClass

  def method1

  end

  # ... and so on

  public            :method1, :method4

  protected      :method2

  private          :method3

end

*在public 等后面加上Symbol literals