探讨javax.xml.validation.Validator类validate方法的命名合理性与设计优化

Great question—let's unpack this from both the method's core responsibility and Java's standard library design conventions.

Is validate() a reasonable name? #

Absolutely. The primary purpose of this method is to perform XML validation against a schema. Populating the Result parameter is a secondary, output-focused behavior tied directly to the validation process—it's not a separate "build result" operation.

This aligns with how many Java XML APIs are structured: for example, javax.xml.transform.Transformer.transform() also takes a Source and Result, where the core action is transformation, and writing to Result is the natural output of that action. The name stays focused on the core intent, not the side effect of producing output.

Should it return Result instead of accepting it as a parameter? #

The current design (accepting a Result parameter) is actually more flexible and aligned with Java's XML ecosystem patterns. Here's why:

• Caller control over Result type: By passing a Result instance, you can choose exactly what type of result you want—DOMResult, StreamResult, SAXResult, etc. If the method returned a Result, you'd either be stuck with a fixed implementation or forced to cast, which reduces flexibility.
• Reusability: You can reuse the same Result instance across multiple validation calls, which is helpful for performance-sensitive workflows (avoiding repeated object creation and garbage collection).
• Clear side-effect visibility: Explicitly passing a Result makes it obvious that the method will modify that object. A return-based design might hide that the result is a new instance, or require extra checks if you were expecting reuse.

That said, if your own validator implementation has simpler needs (e.g., always returns a specific Result type), you could wrap the standard validate() method in a helper that creates and returns a Result for convenience—but the standard API's design is well-justified for general-purpose use.

内容的提问来源于stack exchange，提问作者maxomax