Latest revision as of 19:14, 12 June 2021

Internal

A valid class file starts with 0xcafebabe, followed by the minor version as unsigned short, followed by the major version, as unsigned short.

The following project produces a bytecode-version.jar that reads the bytecode version from a Java class:

https://github.com/ovidiuf/playground/tree/master/java/bytecode/bytecode-version/README.md

@@ Line 1: / Line 1: @@
 =Internal=
-* [[Java_Bytecode#Determine_Bytecode_Version_in_a_Class|Java Bytecode]]
+* [[Java_Bytecode#Java_Bytecode_Version|Java Bytecode]]
+* [[Gradle_Java_Plugin#Use_a_Specific_Java_Version|Specifying a bytecode version in Gradle]]
 =Overview=
+A valid class file starts with <code>0xcafebabe</code>, followed by the minor version as unsigned short, followed by the major version, as unsigned short.
+{|class="wikitable" style="text-align: left;"
+! 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:
+{{External|https://github.com/ovidiuf/playground/tree/master/java/bytecode/bytecode-version/README.md}}