J2SE 8 = 52, 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
http://en.wikipedia.org/wiki/Java_class_file
https://blogs.oracle.com/darcy/entry/bootclasspath_older_source
下次再报jvm的版本的时候就查一下是用哪个吧
J2SE 8 = 52, 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
http://en.wikipedia.org/wiki/Java_class_file
https://blogs.oracle.com/darcy/entry/bootclasspath_older_source
下次再报jvm的版本的时候就查一下是用哪个吧