Compilation of same Java Files

Question

是否可以从不同的系统编译2个相同的Java文件，但是它们都具有相同的操作系统（Windows 7），它们会生成不同的.class文件（大小）？

Answer 1

Yes, you can check if there are different versions of the JDK (Java Development Kit) used to compile your code and the .class file version (differs from java versions)

You can check differences using the javap utility:

javap -verbose path/to/ClassFile.class

and compare output of each class