code: public Bucket getDefaultEventBasedHold(String bucketName) throws StorageException {
      // [START storage_get_default_event_based_hold]
      // Instantiate a Google Cloud Storage client
      Storage storage = StorageOptions.getDefaultInstance().getService();
  
      // The name of a bucket, e.g. "my-bucket"
      // String bucketName = "my-bucket";
  
      Bucket bucket =
          storage.get(bucketName, BucketGetOption.fields(BucketField.DEFAULT_EVENT_BASED_HOLD));
  
      if (bucket.getDefaultEventBasedHold() != null && bucket.getDefaultEventBasedHold()) {
        System.out.println("Default event-based hold is enabled for " + bucketName);
      } else {
        System.out.println("Default event-based hold is not enabled for " + bucketName);
      }
      // [END storage_get_default_event_based_hold]
      return bucket;
    }
docs: Example of how to get default event-based hold for a bucket