为什么要声明getter和setter方法是私有的？ [英] Why would you declare getters and setters method private?

问题描述

我看到了一个代码，其中getter和setter方法被声明为private。我试图找出它背后的逻辑，我真的很难理解为什么你会将它们声明为私有？这与我们试图通过getter和setter实现的完全相反。

I saw a code where getters and setters methods are declared private. I am trying to figure out the logic behind it, and I am really having hard time to understand why would you declare them as private? That's exactly opposite of what we are trying to achieve through getters and setters.

推荐答案

我可以想到几个原因：

• 您希望阻止将来公开访问。

如果一个不同的程序员看到你的代码并希望访问一个变量，但是没有setter和getter，他可能会认为你只是忘记了它们，并自己添加它们。但是，如果您将它们声明为 private ，那么它是一个意图声明，说我不希望从外部更改或访问这些变量。

If a different programmer sees your code and wants access to a variable, but there are no setters and getters, he might think you just forgot about them, and add them themselves. However, if you declare them as private, it's a statement of intent, saying I don't want these variables to be changed or accessed from the outside.

• 您想要设置和获取其他操作

假设你不想要 public 访问者。但也许你想要计算私有变量被改变的次数。每次访问该变量时，使用setter更容易，而不是递增计数。

Say you don't want public accessors. But maybe you want a count of how many times a private variable is changed. It's easier to use a setter rather than incrementing the count every time you access that variable.

• 你想要一个中央访问点

同样，您不希望 public 访问，但在调试期间，您可能希望在每个地方放置一个断点， private 成员被更改。因此，不要在类中的任何地方设置断点，而只需在访问器中设置一个断点。

Again, you don't want public access, but during debugging, you might want to put a breakpoint in every place a private member is changed. So instead of setting breakpoints everywhere in the class, you just set one in the accessor.

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