What version of JDK is the jar file compiled with?

Question

Java

Need to know what version of JDK this jar file is compiled with ? PS This is the usual Hello World - I compiled it as an example. OpenJDK or OracleJDK or some others?
How can I do that? I know that, for example, the command java -Xinternalversionwill say which compiler this particular version of the JDK was built with. Is it possible to do this on the current or on any other jar file?

Answer 1

If we ignore the license side of the issue and still want to know the version, then you can take one of the class files from the jar and run
Unix/Linux: Windows: Java 1.2: major version 46 Java 1.3: major version 47 Java 1.4: major version 48 Java 5 : major version 49 Java 6: major version 50 Java 7: major version 51 Java 8: major version 52 Java 9: ​​major version 53 Java 10: major version 54 Java 11: major version 55