向我解释什么是二传手和吸气剂 [英] Explain to me what is a setter and getter

问题描述

什么是二传手和吸气剂?我为什么需要它们?有效地使用它们的一个好例子是什么? setter和getter的意义是什么?

What are setters and getters? Why do I need them? What is a good example of them in use in an effective way? What is the point of a setter and getter?

更新: 我可以得到一些编码示例吗?

Update: Can I get some coding examples please?

推荐答案

getter是一种获取属性值的方法.设置器是一种设置属性值的方法.关于它们的功效存在一些争论，但要点通常是:

A getter is a method that gets the value of a property. A setter is a method that sets the value of a property. There is some contention about their efficacy, but the points are generally:

• 确保封装的完整性

• for completeness of encapsulation

以在内部细节发生变化时保持一致的界面

to maintain a consistent interface in case internal details change

当您需要在获取或设置周围添加一些逻辑(例如在编写值之前对其进行验证)时，更有用.

More useful is when you need to add some logic around getting or setting, like validating a value before you write it.

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