来自Scala的Java通配符泛型类型互操作

我正在用scala编写，我正在处理一个Java API，它返回一个

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List问题不在于互操作。这绝对不应该编译，等价的Java代码也不应该编译

list谢谢你的评论帮助我认识到了我的问题，那就是我不理解存在类型/java的通配符。
val patient = new Patient()
patient.setId(ID)
val patientASResource: IResource = patient
entry.getResource.getContained.getContainedResources.add(patient)

type mismatch;
  found   : patientASResource.type (with underlying type ca.uhn.fhir.model.api.IResource)
  required: ?0 where type ?0 <: ca.uhn.fhir.model.api.IResource
         entry.getResource.getContained.getContainedResources.add(patientASResource)
                                                                  ^
 one error found

//From what I understand of "Java wildcards" per here: http://stackoverflow.com/a/21805492/2741287
type Col = java.util.Collection[_ <: IResource]
val resList: Col = entry.getResource.getContained.getContainedResources
val lst: Col = asJavaCollection(List(patient))
resList.addAll(lst)

type mismatch
found : java.util.Collection[_$1(in method transformUserBGs)] where type _$1(in method transformUserBGs) <: ca.uhn.fhir.model.api.IResource 
 required: java.util.Collection[_ <: _$1(in type Col)]
 resList.addAll(lst)
 ^

entry.getResource.getContained.
  getContainedResources.asInstanceOf[java.util.List[IResource]].add(patient)