[英]java method retrieves
I need to send collection to this method: 我需要将集合发送到此方法:
public boolean[] save(T... entities) {
return _saveOrUpdateIsNew(entities);
}
and I tried to pass the collection: 我试图通过收藏:
List<Client> clientsToUpdate = new ArrayList<Client>();
save(clientsToUpdate );
but I get a compilation error that the method type is not applicable for List<Client>
但是我收到编译错误,指出方法类型不适用于
List<Client>
EDITED: 编辑:
After I added the line: 添加行之后:
clientsToUpdate.toArray(new Client[0]);
I have this compilation error: 我有这个编译错误:
The method save(Client...) in the type BaseDAO<Client,Integer> is not applicable for the arguments (Client[])
The method you mentioned is using varargs, it means it accepts a single Client
instance or an array of Client
objects. 您提到的方法使用的是varargs,这意味着它接受单个
Client
实例或Client
对象的数组。 You should convert your List
to array like this: 您应该像这样将
List
转换为数组:
List<Client> clientsToUpdate = new ArrayList<Client>();
Client[] clients = clientsToUpdate.toArray(new Client[0]);
save(clients);
This should work unless you have multiple Client
classes in your project. 除非您的项目中有多个
Client
类,否则这应该起作用。
T.. is not a collection, it's an array. T ..不是集合,而是一个数组。 So, you have to convert it.
因此,您必须对其进行转换。 Perhaps with something like this:
也许是这样的:
for(Object o: T)
myCollection.add(o);
EDIT: 编辑:
Oh sorry, I think you want the different way. 哦,对不起,我想您希望使用其他方式。 If you want to pass a Collection to your method, convert it to an array:
如果要将Collection传递给方法,请将其转换为数组:
Object[] array = myCollection.toArray();
You can't pass any Collection to vararg method (unless method signature is (Collection...), but that's almost certainly not what you want here) . 您不能将任何Collection传递给vararg方法(除非方法签名是(Collection ...),但这几乎肯定不是您想要的)。 Try with Array.
尝试使用数组。
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