**FastAPI** is helemaal gebaseerd op deze type hints, ze geven veel voordelen.

Maar zelfs als je **FastAPI** nooit gebruikt, heb je er baat bij om er iets over te leren.

/// note

Als je een Python expert bent en alles al weet over type hints, sla dan dit hoofdstuk over.

///

## Motivatie

Laten we beginnen met een eenvoudig voorbeeld:

 *
 * @author Kevin Bourrillion
 * @since 1.0
 */
@GwtCompatible
public final class Ints extends IntsMethodsForWeb {
  private Ints() {}

  /**
   * The number of bytes required to represent a primitive {@code int} value.
   *
   * <p>Prefer {@link Integer#BYTES} instead.
   */
  // The constants value gets inlined here.
  @SuppressWarnings("AndroidJdkLibsChecker")
  public static final int BYTES = Integer.BYTES;

// StorageInfo - combines output of StorageInfo across all erasure coded object sets.
func (s *erasureSets) StorageInfo(ctx context.Context) StorageInfo {
	var storageInfo madmin.StorageInfo

	storageInfos := make([]madmin.StorageInfo, len(s.sets))

	g := errgroup.WithNErrs(len(s.sets))
	for index := range s.sets {
		g.Go(func() error {
			storageInfos[index] = s.sets[index].StorageInfo(ctx)
			return nil
		}, index)
	}

   *
   * [rfc_7468]: https://tools.ietf.org/html/rfc7468
   */
  fun certificatePem(): String = certificate.certificatePem()

  /**
   * Returns the private key encoded in [PKCS #8][rfc_5208] [PEM format][rfc_7468].
   *
   * [rfc_5208]: https://tools.ietf.org/html/rfc5208
   * [rfc_7468]: https://tools.ietf.org/html/rfc7468
   */
  fun privateKeyPkcs8Pem(): String =

 * on what responses can be stored, and which requests can be satisfied by those stored responses.
 *
 * See [RFC 7234, 5.2](https://tools.ietf.org/html/rfc7234#section-5.2).
 */
class CacheControl internal constructor(
  /**
   * In a response, this field's name "no-cache" is misleading. It doesn't prevent us from caching

    }

    /**
     * Sets the context handle for the async notify request.
     *
     * @param contextHandle the context handle from registration
     */
    public void setContextHandle(byte[] contextHandle) {
        this.contextHandle = contextHandle != null ? contextHandle.clone() : null;
    }

    /**
     * Gets the context handle.
     *
     * @return the context handle
     */

        // Default constructor
    }

    /**
     * Sets the list of search result documents.
     *
     * @param documentItems The list of search result documents
     */
    public void setDocumentItems(final List<Map<String, Object>> documentItems) {
        this.documentItems = documentItems;
    }

    /**
     * Sets the facet response containing aggregated search facets.
     *

        }

        propertyMap.put(key, value);
    }

    /**
     * Gets the map of parser features.
     *
     * @return the feature map
     */
    public Map<String, String> getFeatureMap() {
        return featureMap;
    }

    /**
     * Sets the map of parser features.
     *
     * @param featureMap the feature map to set
     */

    public <T> T[] toArray(final T[] a) {
        return parent.toArray(a);
    }

    /**
     * Gets the starting position of the current page in the overall result set.
     *
     * @return the start position (0-based)
     */
    public int getStart() {
        return start;
    }

    /**
     * Gets the offset value used for pagination calculations.
     *
     * @return the offset value
     */

            }
        });
    }

    /**
     * Gets the username of the current user.
     *
     * @return The username, or "guest" if not logged in.
     */
    public String getUsername() {
        return getRequestManager().findUserBean(FessUserBean.class).map(FessUserBean::getUserId).orElse(Constants.GUEST_USER);
    }

    /**
     * Gets the request manager.
     *
     * @return The request manager.