How Do Java Major Version Numbers Determine JVM Compatibility?-javaTutorial-php.cn

How Do Java Major Version Numbers Determine JVM Compatibility?

Patricia Arquette

Release： 2024-12-27 03:45:13

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How Do Java Major Version Numbers Determine JVM Compatibility?

Java Class File Format Major Version Numbers Decoded

The Java Virtual Machine (JVM) maintains version numbers for class files to ensure compatibility during execution. These version numbers, referred to as major versions, play a crucial role in determining which JVM can run a particular class file.

Major Version Numbers

The following table provides a comprehensive list of Java major version numbers and their corresponding Java versions:

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

Source of the List

The provided list of major version numbers originated from the class version stored in the class file. This version resides in the eighth byte offset of the file and indicates which Java version the class file is intended for.

Reference Materials

For additional information on class file versions:

Oracle Java Documentation: [Java Virtual Machine Specification](https://docs.oracle.com/javase/specs/jvms/se11/html/jvms-4.html#jvms-4.1)
Wikipedia: [Java Class File](https://en.wikipedia.org/wiki/Java_class_file#Versions)

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