Java Bytecode Version
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Internal
Overview
A valid class file starts with 0xcafebabe, followed by the minor version as unsigned short, followed by the major version, as unsigned short.
| Java Version | Bytecode Version |
|---|---|
| 1.0 | 45.0 |
| 1.1 | 45.3 |
| 1.2 | 46.0 |
| 1.3 | 47.0 |
| 1.4 | 48.0 |
| 5 | 49.0 |
| 6 | 50.0 |
| 7 | 51.0 |
| 8 | 52.0 |
| 9 | 53.0 |
| 10 | 54.0 |
| 11 | 55.0 |
| 12 | 56.0 |
| 13 | 57.0 |
| 14 | 58.0 |
| 15 | 59.0 |
| 16 | 60.0 |
| 17 | 61.0 |
Playground
The following project produces a bytecode-version.jar that reads the bytecode version from a Java class: