Why does ListObjects return a prefix as a separate object in an array?

Question

I uploaded 4 objects to S3. The keys of the object are as follows:

4eec12eb0a588620cccad16f/MumDad70s.jpg
4eec12eb0a588620cccad16f/NathanI-1.jpg
4eec12eb0a588620cccad16f/ProfilePic.png
4eec12eb0a588620cccad16f/nathan-orange.jpg

My code for requesting objects:

var req = new ListObjectsRequest()
    .WithBucketName(BucketName)
    .WithPrefix(jobid + "/")
    .WithDelimiter("/");
var objs = _s3Client.ListObjects(req);

In the answer, although the prefix is ​​not really its own object, but rather a string preceding the key of the actual objects, I get the following 5 returned objects:

4eec12eb0a588620cccad16f/
4eec12eb0a588620cccad16f/MumDad70s.jpg
4eec12eb0a588620cccad16f/NathanI-1.jpg
4eec12eb0a588620cccad16f/ProfilePic.png
4eec12eb0a588620cccad16f/nathan-orange.jpg

Why does the prefix return as if it were a unique object? How can I simply return files with the specified prefix without sending a filter after filtering to get rid of the prefix object?

Answer 1

(, , , , Java): http://docs.amazonwebservices.com/AWSJavaSDK/latest/javadoc/com/amazonaws/services/s3/AmazonS3.html#listObjects%28com.amazonaws.services.s3.model.ListObjectsRequest%29

:

listObjects "foo/" "/" , ObjectListing, ( "foo/boo" ) ( "Foo//" ). , listObjects, .

. , - , .