public class ListKeysV1 {
	private static String bucketName = "***bucket name***";

    public static void main(String[] args) throws IOException {
    	AmazonS3 s3client = new AmazonS3Client(new ProfileCredentialsProvider());        

        ListObjectsRequest listObjectsRequest = new ListObjectsRequest()
            .withBucketName(bucketName)
            .withPrefix("m");
        ObjectListing objectListing;

        do {
                objectListing = s3client.listObjects(listObjectsRequest);
                for (S3ObjectSummary objectSummary : 
                    objectListing.getObjectSummaries()) {
                    System.out.println( " - " + objectSummary.getKey() + "  " +
                            "(size = " + objectSummary.getSize() + 
                            ")");
                }
                listObjectsRequest.setMarker(objectListing.getNextMarker());
        } while (objectListing.isTruncated());
    }
}