code: public List<Acl> listDefaultBucketAcls(String bucketName) {
      // [START listDefaultBucketAcls]
      List<Acl> acls = storage.listDefaultAcls(bucketName);
      for (Acl acl : acls) {
        // do something with ACL entry
      }
      // [END listDefaultBucketAcls]
      return acls;
    }
docs: [VARIABLE "my_unique_bucket"]