<T extends String>

[Heba Mahmoud]

    

public class Test <T extends String > {

}

how this don't cause complair error although the String class is final and can't be exteneded.
as what happens when when say

 
public class Test  extends String {

}   

[Deepak Bala]

You are not extending string there. The construct simply means the generic type can be anything that extends String. Of course String is final and nothing can extend it.

[Henry Wong]

Also, T can also be String -- and so since String is a final class, it can only be String.

Henry