我遇到問題讓這種類型轉換正常工作。我的猜測是有界的通用通配符<? super SomeType >不適用於接口實現。類型與有界通配符不匹配?超類型
// 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>>
你是對的,謝謝。幾分鐘後,我會刪除我的答案。 – 2012-01-07 19:49:05