Wildcards play an important role in the type system; they provide a useful typebound for the family of types specified by a generic class.
通配符在类型系统中具有重要的意义,它们为一个泛型类所指定的类型集合提供了一个有用的类型范围。
2
It would end up extending the bound of the type parameter!
该类会最终继承类型参数的界限!
3
A WSDL service is a collection of related ports, each of which consists of a port typebound to a particular protocol and available at a particular endpoint address.