Suddenly inexplicable want to say static class this thing

Static class:

Still have a lot of classes are static class (this own Baidu), we can new a static class try, will find that static class can not be instantiated, good magic!

This time I would think that static classes are also abstract classes? With the anti-compiler found, I go, really ah, static class is really abstract class, and so on ... What I found is that static classes are not just abstract classes, but sealed!!! sealed!!! sealed!!! Important thing to say three times , so we come to the conclusion that static classes are abstract sealed class (sealed class is what: can not be inherited )--for example, we all know: String class, this is sealed class, you can F12 yourself to see, note that: Sealed classes can also be instantiated!      

Suddenly inexplicable want to say static class this thing