公共财产VS带吸气剂的私人财产？ [英] Public property VS Private property with getter?
问题描述
这个问题困扰了我一段时间。可以直接进入的公共财产还是带有吸气剂的私人财产？哪一个更好/更正，为什么？
This question has puzzled me for a while. A public property that can be accessed directly or a private property with getter? Which one is better/correct and why?
推荐答案
直接暴露字段被认为是一种不好的做法。
Exposing fields directly is considered a bad practice.
最好保持字段为私有，只显示getter和setter。一个优点是您可以为getter和setter选择不同的访问级别，而一个字段只有一个访问级别。使用getter的另一个好处是它允许你在不改变类接口的情况下改变实现。
It is better to keep the field private and only expose the getter and setter. One advantage is that you can choose different access levels for the getter and setter, whereas a field has only a single access level. Another advantage of using getters is that it allows you to change the implementation without changing the class interface.
更好的方法是尽可能避免使用getter和setter。而是使用封装更高级别行为的方法。这是因为对象不应该篡改其他对象的内部状态（通过直接访问字段，或间接通过getter和setter）。
Even better is to avoid getters and setters where possible. Instead use methods that encapsulate a higher-level behaviour. This is because objects shouldn't be tampering with other objects' internal state (either via directly accessing fields, or indirectly via getters and setters).
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