说明：  Java源代码经过编译以后在JVM中执行。由于JVM界面是完全透明的，Java类文件能够很容易通过反编译器重新转换成源代码。因此，所有的算法、类文件等都可以以源代码的形式被公开，使得软件不能受到保护，为了保护产权
(Java source code through the compiler to perform after the JVM. JVM because the interface is completely transparent, Java class files can be easily re-adoption of the anti-compiler to convert the source code. Therefore, all the algorithms, types of documents can all be in source code form to be open, making the software should not be protected in order to protect the property rights)