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For JDK 18 and later, use the {@snippet ...} tag when you need more than a plain code display: it supports highlighting, replacement text, links to API elements, and selected source regions. For a simple example in a Markdown documentation comment, a Markdown code span or block may be enough. Check which JDK runs javadoc before choosing a format.
Choose the right way to show code
| Format | Best for | Trade-off |
|---|---|---|
Inline {@snippet : ...} |
Short examples kept beside the explanation, especially when you want snippet markup | The content is inside a documentation comment, so Java comment parsing rules apply. |
External class=... or file=... |
Longer, reusable, or testable examples; examples with comment text that cannot safely go inline | You need the snippet file in the expected location or must configure --snippet-path. |
| Hybrid inline and external snippet | A stable example whose source and displayed documentation should remain aligned | You maintain two representations; the Standard Doclet checks that they produce the same result. |
| Markdown code span or block | Simple code in a Markdown documentation comment | It does not provide snippet-specific features such as markup transformations and links to program elements. |
The Oracle JavaDoc Guide, Release 26, dated March 16, 2026, describes {@snippet ...} as a replacement for older {@code ...} and <pre>{@code ...}</pre> techniques when you need greater convenience and flexibility. Snippets were added in JDK 18, so projects using earlier JDKs to generate documentation cannot rely on this tag.
Write a short inline snippet
Place a colon after the snippet attributes, then put the code on following lines. For example:
/**
* Prints a greeting.
* {@snippet :
* System.out.println("Hello, World!");
* }
*/The Standard Doclet removes incidental indentation from an inline snippet in a way similar to String.stripIndent. The closing brace’s indentation can affect how much indentation remains in the output. Generate the Javadoc and inspect the result rather than assuming the source comment’s whitespace will appear unchanged.
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Use an external file for longer or reusable examples
An external snippet keeps the example in a source file instead of embedding it in a comment. Use class= to select Java source or file= for another file type. Snippet files can be placed in a snippet-files directory alongside the documented package, or in a separate hierarchy supplied to javadoc with --snippet-path.
For example, a documentation comment can refer to a named region in a Java class:
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/**
* {@snippet class=Example region=main}
*/Mark the excerpt in the external file:
// @start region=main
System.out.println("Hello, World!");
// @end region=mainThe named region lets the comment show a focused part of a larger example. Multiple regions can be referenced separately.
Set the language and an optional identifier
Snippet attributes are written as name=value pairs. Simple identifiers and numbers can be unquoted; values may also use single or double quotes. Attribute values do not support escape sequences. The Standard Doclet recognizes java and properties as language names. An id is passed through to generated HTML for tools that analyze snippets; the Standard Doclet does not use it to render the snippet.
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{@snippet lang="java" id="greeting" :
System.out.println("Hello, World!");
}Highlight, replace, or link selected code
Snippet markup goes in comments using the conventions of the declared snippet language. For Java, you can add a markup comment to a line:
{@snippet :
System.out.println("Hello, World!"); // @highlight substring="Hello"
}@highlightcan target a literalsubstring, aregex, or the entire line when neither selector is supplied.@replacechanges the text shown in the rendered snippet while leaving the source form suitable for compilation. It is useful, for example, to display an ellipsis instead of a legal placeholder.@linklinks selected snippet text to a program element.
For a transformation that spans multiple lines, use a region in the markup and close it with @end. Named regions make the start and end explicit, and regions may nest. If regions overlap, Oracle’s guide says to use named regions to establish their relationship.
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Avoid inline parsing traps
An inline snippet is still part of a Java documentation comment, so the Java source parser can affect what you write inside it. Do not put */ in the inline body: it ends the enclosing comment. Unicode escapes are interpreted when the source is parsed, and braces in an inline body must balance so the parser can find the tag’s closing brace. Use an external snippet when the example needs a literal */ or a block comment.
Markup comments can also be awkward in Java text blocks or formats without end-of-line comments. Oracle documents using a region to scope markup in such cases; a markup comment ending in a colon applies to the following line.
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Verify the generated Javadoc
Run the Standard Doclet with the same JDK version your project uses to publish its documentation, then check the generated page for indentation, highlighting, links, and region selection. Oracle specifically recommends inspecting generated output when using regular expressions, to confirm that the intended text matched.
If the example must compile or run as part of your test process, an external source file is easier to compile and execute than code embedded only in the documentation comment. A hybrid snippet can pair inline presentation with an external file and optional region; the Standard Doclet checks that both forms process to the same result. Oracle recommends converting to hybrid after the example has stabilized, since keeping both forms creates duplication.
Quick Recap
References
- Oracle JavaDoc Guide, Release 26
- Oracle Snippets guide, Release 25
- Oracle Markdown in Documentation Comments guide, Release 25
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