javap - The Java Class File Disassembler
Usage
javap -verbose YourClass
Output
...SourceFile: "YourClass.java"
minor version: 0
major version: 50
flags: ACC_PUBLIC, ACC_SUPER
...
Major version
J2SE 7 = 51,J2SE 6.0 = 50,
J2SE 5.0 = 49,
JDK 1.4 = 48,
JDK 1.3 = 47,
JDK 1.2 = 46,
JDK 1.1 = 45
Ref:
http://reverseengineering.stackexchange.com/questions/1328/find-out-a-java-class-files-compiler-version
http://docs.oracle.com/javase/7/docs/technotes/tools/windows/javap.html
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