What Java Release Corresponds to Each Major Version Number in the Class File Format?

Major Version Number Correspondences in Java Class File Format

The Java class file format undergoes revisions with each release of the Java platform, resulting in updates to its major version numbers. Here is a list of the major version numbers that correspond to each Java release:

Java Version	Major Version
23	67
22	66
21	65
20	64
19	63
18	62
17	61
16	60
15	59
14	58
13	57
12	56
11	55
10	54
9	53
8	52
7	51
6	50
5	49
1.4	48
1.3	47
1.2	46
1.1	45
1.0.2	45

This list is derived from the class version specification found in the Java class file format. Minor versions are not included as they have not been a major factor in the compatibility of class files.

You can find more detailed information about the meaning and significance of these major versions in the following resources:

• https://docs.oracle.com/javase/8/docs/technotes/guides/classfile/ (Byte Offset 7 link)
• https://www.giltene.com/blog/2017/12/28/java-classfile-format.html (Additional Info link)

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