ruby 新建对象_Ruby中的冻结对象

╰半橙微兮° 2023-03-05 09:46 39阅读 0赞

ruby 新建对象

## Ruby| 冻结物体 **(**Ruby | Frozen objects**)** ##

**Freezing objects or instances in Ruby** means that we are *disallowing them to get modified in the future.* You can understand this in a way that you can’t change their instance variables, you can’t provide singleton methods to it as well as if we are freezing a class or a module, and you can’t add, remove and bring some changes in its methods.

**在Ruby中冻结对象或实例**意味着我们*不允许将来对其进行修改。* 您可以这样一种方式来理解它：您不能更改其实例变量，不能向其提供单例方法，也不能冻结我们的类或模块，也不能添加，删除和带入某些变量。方法的变化。

**How to freeze objects in Ruby?**

**如何在Ruby中冻结对象？**

You can freeze objects in Ruby by in invoking freeze method which is a method defined in Object Class in Ruby's library. There is *no method to unfreeze* the object which is once frozen.

您可以通过调用Frozen方法冻结Ruby中的对象，该方法是Ruby库中Object Class中定义的方法。 *没有方法可以解冻*一旦冻结的对象。

**Syntax:**

**句法：**

Object_name.freeze

**How to check whether the object is frozen or not?**

**如何检查物体是否冻结？**

There is a very simple way to check whether the object is frozen or not. You only have to *invoke frozen? method of Object class*. If the method returns true then the object is frozen otherwise not.

有一种非常简单的方法来检查对象是否冻结。 您只需要*调用冻结？* *Object类的方法* 。 如果该方法返回true，则将冻结对象，否则不会冻结。

**Syntax:**

**句法：**

Object_name.frozen?

**Program:**

**程序：**

=begin
      Ruby program to demonstrate frozen objects
    =end	
    
    class Multiply
    	def initialize(num1,num2)
    		@f_no = num1
    		@s_no = num2
    	end
    	def getnum1
    		@f_no
    	end
    	def getnum1
    		@s_no
    	end
    	def setnum1=(value)
    		@f_no = value
    	end
    	def setnum2=(value)
    		@s_no = value
    	end
    end
    
    mul = Multiply.new(23,34)
    mul.freeze
    
    if(mul.frozen?)
    	puts "mul is frozen object"
    else
    	puts "mul is not frozen object"
    end
    
    mul.setnum2=12
    mul.setnum1=13
    
    puts "Y is #{mul.getnum1()}"
    puts "Z is #{mul.getnum2()}"

**Output**

**输出量**

mul is frozen object
    can't modify frozen Multiply
    (repl):20:in `setnum2='
    (repl):33:in `<main>'

**Explanation:**

**说明：**

In the above code, you can observe that we have frozen the object mul with the help of Object.freeze method. We are getting an error known as FrozenError because we are trying to bring changes in the variables of the frozen object with the help of some other methods. We know that we can’t bring any change in the variables of the object which is frozen.

在上面的代码中，您可以观察到我们已经借助Object.freeze方法冻结了对象mul 。 我们收到一个称为FrozenError的错误，因为我们试图借助其他一些方法来更改冻结对象的变量。 我们知道，冻结的对象的变量无法带来任何变化。

> 翻译自: [https://www.includehelp.com/ruby/frozen-objects-in-ruby.aspx][https_www.includehelp.com_ruby_frozen-objects-in-ruby.aspx]

ruby 新建对象

[https_www.includehelp.com_ruby_frozen-objects-in-ruby.aspx]: https://www.includehelp.com/ruby/frozen-objects-in-ruby.aspx