37. Switch 14+ in Java.md 38. Object Class in Java.md 39. Exception Handling in Java.md 40. String in Java.md 41. StringBuilder and StringBuffer in Java.md 42. Multithreading in Java.md 43.

Use the Tortoise and Hare (two-pointer) technique with a slow pointer and a fast pointer. Both pointers start at the head. The fast pointer moves two steps for every single step the slow pointer takes ...

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值得注意的是，该夹具在 skip.languages 中显式排除了 C：因为插件注册表接收的是宿主语言回调，C API 不暴露注册函数，也就没有与之配对的 clear/unregister 函数。这正是"每个插件类型（OcrBackend、EmbeddingBackend 等）都有各自类型安全注册表"这一设计的直接体现。