C# sealed vs Java final

FROM：http://stackoverflow.com/questions/10170633/c-sharp-sealed-vs-java-final

回答的很精妙：

That's because final in Java means plenty of different things depending on where you use it whereas sealed in C# applies only to classes.
In Java final can be applied to:

• classes, which means that the class cannot be inherited. This is the equivalent of C#'s sealed.   


• methods, which means that the method cannot be overridden in a derived class. This is the default in C#, unless you declare a method as virtual and in a derived class this can be prevented for further derived classes with sealed again.


• fields and variables, which means that they can only be initialized once. For fields the equivalent in C# is readonly.