getter / setter在Java中有什么用处？ [英] What are the uses of getter/setters in Java?

问题描述

我已经看到成员变量赋予一个私有修饰符，然后使用getter / setter方法来设置和获取变量的值（以标准化名称）。

I have seen member variables given a private modifier and then using getter/setter methods just to set and get the values of the variable (in the name of standardization).

为什么不使变量公开本身（除了像spring框架这样取决于getter / setters为IOC等）。它服务于目的。

Why not then make the variable public itself (Other than cases like spring framework which depends on getter/setters for IOC etc). It serves the purpose.

在C＃中，我已经看到getter / setter与成员变量的大小写。为什么不让变量公开？

In C# I have seen getter/setter with Capitalization of the member variable. Why not make the variable public itself?

推荐答案

为了从第一个获得稳定的API 射击。 Java gurus认为，如果以后，在设置/获取实例成员时可能需要一些额外的逻辑，则不希望通过将公共字段替换为公共方法来打破现有API 。这是Java中的主要原因。

In order to get a stable API from the first shot. The Java gurus thought that if later on, you might want to have some extra logic when setting/getting an instance member, you don't want to break existing API by replacing public fields with public methods. This is the main reason in Java.

在C＃的情况下，由于二进制接口兼容性，使用公共属性而不是公共字段。有人在这里请SO 一个类似问题。

In the case of C#, public properties are used instead of public fields because of binary interface compatibility. Someone asked a similar question right here, on SO.

所以，这是所有关于封装一些逻辑，同时仍然保留接口为未来打样。

So, it's all about encapsulating some logic while still preserving interface for... future proofing.

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