Java naming convention with acronyms [duplicate]

This question already has answers here: 开发者_开发百科 Closed 11 years ago.

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Java Naming Convention with Acronyms

Is it getXml() or getXML()? Is there any official Sun/Oracle document on this?

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You'll find both in the Java Standard API, so if there is a convention, it's not being widely followed.

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Both are correct. Use your preferred way, and be consistent with it throughout your code.

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Not specified

Except for variables, all instance, class, and class constants are in mixed case with a lowercase first letter. Internal words start with capital letters. Variable names should not start with underscore _ or dollar sign $ characters, even though both are allowed.