.class
1 claimant
1 primary
0 secondary
unambiguous primary
SWH popularity
From the SWH-MSR-ARV dataset (Desmazières, Di Cosmo, Lorentz, MSR 2025; file nb_extensions_alphanum.csv) — one row per (ext, year) in the full SWH archive. Case-aggregated. citation.
179.6M
total occurrences
53.0M
since 2019 (29.5%)
1970–2023
years active
Case variants in archive: .class (179.6M), .CLASS (823), .Class (451), .CLAss (1), .claSS (1) — aggregated above.
Attribution status
This extension is attributed to java as primary by 1 authoritative claim.
Authoritative sources: ✗ Linguist · no claim ✗ Pygments · no claim ✓ Wikidata · Q251 ✗ Wikipedia · no claim
Disagree or have a correction? Open a labelling issue.
Prior manual labels (1)
| Label | Annotator | Status | Evidence (excerpt) | |
|---|---|---|---|---|
| binary:executable class file — ref | @acherm | new | JVM byte code... Not only Java is using it, Scala and Groovy as well for instance | discuss |
Claimants (1)
Languages that list
.class among their extensions. Strength reflects whether the upstream source treated it as their primary extension.| Language | Source | Strength |
|---|---|---|
| java | wikidata | primary |
Wikidata says… (2)
File formats, image formats, audio codecs and other non-PL
entities that claim
.class on Wikidata
(property P1195) or in the Wikipedia infobox.
Source: data/derived/external_extension_index.csv.
Click Use as new PL on any row to open the
Add-PL form pre-filled with that entry's name, Wikipedia/Wikidata
URL, and this extension — one submission creates the PL + claim.
| Format | Class (Wikidata P31) | Suggested label | MIME | Notes | Action |
|---|---|---|---|---|---|
| Java bytecode Q137496 instruction set of the Java virtual machine | file format; bytecode | — | — | — | Use as new PL ↗ |
| Java class file Q2193155 file format | file format | — | application/java; application/java-byte-code; application/java-vm; application/x-httpd-java; application/x-java; application/x-java-class; application/x-java-vm | — | Use as new PL ↗ |
SWH-mined examples (0)
No archived examples for .class in our local mirror yet.