从Java中的方法返回状态标志和消息的最佳方式 [英] Best way to return status flag and message from a method in Java

问题描述

我有一个简单的欺骗性场景，我想要一个简单的解决方案，但是最正确或大多数Java是不明显的。

我在一些类中有一个小的验证（客户端客户端）方法。验证可能会由于多种原因而失败，我想为控制流返回一个简单的布尔值，但也为用户返回一个String消息。这些是我可以想到的可能性：

• 返回一个布尔值，并传递一个StringBuilder来收集消息。这是最接近于C风格的方式。


• 抛出异常，而不是返回false，并包含消息。我不喜欢这个，因为失败不是例外。


• 使用布尔值和String创建一个名为AuthenticationStatus的新类。对于一个小的方法来说，这似乎是过分的。


• 将消息存储在成员变量中。这将引入一个潜在的竞争条件，我不喜欢这意味着一些状态不是真的存在。

任何其他建议？

修改关闭此选项

• 返回null成功 - 这是不安全的吗？

修改解决方案：

我去了最OO的解决方案，并创建了一个小的AuthenticationResult类。我不会用任何其他语言，但我喜欢它在Java。我也喜欢返回String []的建议
，因为它像null返回但更安全。 Result类的一个优点是，如果需要，您可以获得更多详细信息的成功消息。

解决方案

返回一个小对象布尔标志和String里面都可能是最像OO的方式，尽管我同意这样一个简单的例子似乎是过度的。

另一个替代方法是始终返回一个String，并且具有null（或一个空String - 你选择哪个）表示成功。只要返回值在javadoc中清楚地解释，就不应该有任何混淆。

I have a deceptively simple scenario, and I want a simple solution, but it's not obvious which is "most correct" or "most Java".

Let's say I have a small authenticate(Client client) method in some class. The authentication could fail for a number of reasons, and I want to return a simple boolean for control flow, but also return a String message for the user. These are the possibilities I can think of:

• Return a boolean, and pass in a StringBuilder to collect the message. This is the closest to a C-style way of doing it.
• Throw an exception instead of returning false, and include the message. I don't like this since failure is not exceptional.
• Create a new class called AuthenticationStatus with the boolean and the String. This seems like overkill for one small method.
• Store the message in a member variable. This would introduce a potential race condition, and I don't like that it implies some state that isn't really there.

Any other suggestions?

Edit Missed this option off

• Return null for success - Is this unsafe?

Edit Solution:

I went for the most OO solution and created a small AuthenticationResult class. I wouldn't do this in any other language, but I like it in Java. I also liked the suggestion of returning an String[] since it's like the null return but safer. One advantage of the Result class is that you can have a success message with further details if required.

解决方案

Returning a small object with both the boolean flag and the String inside is probably the most OO-like way of doing it, although I agree that it seems overkill for a simple case like this.

Another alternative is to always return a String, and have null (or an empty String - you choose which) indicate success. As long as the return values are clearly explained in the javadocs there shouldn't be any confusion.

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