What does it mean for a non generic class to extend a generic class

Question

public class B extends C  {

}

What does this mean? That C needs to extend A? What extra restriction am I putting instead of just saying B ext

Answer 1

C does not mean that C is extending A, it means it can have A as the type parameter.

This is very similar to Comparable and Comparator interfaces in java.

Consider following example

public class NameSort implements Comparator {
   public int compare(Employee one, Employee another){
       return (int)(one.getName() - another.getName());
   }
}

means that Comparator is using Employee objects for sorting them using its name.

You can also take another example

   List list = new ArrayList();

This line means that List is using String objects as parameters