我遇到问题让这种类型转换正常工作。我的猜测是有界的通用通配符<? super SomeType >不适用于接口实现。类型与有界通配符不匹配?超类型
// sample class definitions
public interface IFace<T> { ... }
public class MyClass<T1, T2> { ... }
public class UtilityClass<T> {
public List<MyClass<T, ? super IFace<T>>> getList() { ... }
}
public class Actor extends SomeObj implements IFace<TypeA> { ... }
// use...
UtilityClass<TypeA> utility = new UtilityClass<TypeA>();
List<MyClass<TypeA, Actor>> list = utility.getList();
Type mismatch: cannot convert from List<MyClass<TypeA, ? super IFace<TypeA>> to List<MyClass<TypeA, Actor>>
你是对的,谢谢。几分钟后,我会删除我的答案。 – 2012-01-07 19:49:05