我已经检查了如何覆盖泛型。考虑CrudRepository
我可以覆盖:
<S extends T> S save(S var1);
在我的存储库中:
public interface ChannelDetailsRepository extends IgniteRepository<ChannelDetails, Long> {
@Override
default ChannelDetails save(ChannelDetails entity) {
throw new UnsupportedOperationException();
}
...
}
但有些情况尚不清楚:
<S extends T> Iterable<S> save(Iterable<S> var1);
我尝试过使用(在ChannelDetailsRepository
界面中)
@Override
default Iterable<ChannelDetails> save(Iterable<ChannelDetails> entities) {
throw new UnsupportedOperationException();
}
我的尝试因编译错误而失败:
Error:(28, 38) java: name clash: save(java.lang.Iterable<com.nextiva.calendar.entity.ChannelDetails>) in com.nextiva.calendar.dao.ignite.ChannelDetailsRepository and <S>save(java.lang.Iterable<S>) in org.springframework.data.repository.CrudRepository have the same erasure, yet neither overrides the other
Error:(26, 5) java: method does not override or implement a method from a supertype
并且我不知道如何修复此通用覆盖。
答案 0 :(得分:3)
您需要保留其他类型参数S
,以便该方法接受并分别返回T
ChannelDetails
的子类型。
@Override
default <S extends ChannelDetails> Iterable<S> save(Iterable<S> entities) {
throw new UnsupportedOperationException();
}