@GwtCompatible
final class CollectPreconditions {

  static void checkEntryNotNull(Object key, Object value) {
    if (key == null) {
      throw new NullPointerException("null key in entry: null=" + value);
    } else if (value == null) {
      throw new NullPointerException("null value in entry: " + key + "=null");
    }
  }

  @CanIgnoreReturnValue
  static int checkNonnegative(int value, String name) {
    if (value < 0) {

    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }

        if (obj instanceof OrArtifactFilter other) {
            return filters.equals(other.filters);
        } else {
            return false;
        }
    }

    assertEqualInOrder(values, multimap().get(key));

    if (!values.isEmpty()) {
      assertEqualInOrder(values, multimap().asMap().get(key));
      assertFalse(multimap().isEmpty());
    } else {
      assertNull(multimap().asMap().get(key));
    }

    assertEquals(values.size(), multimap().get(key).size());
    assertEquals(values.size() > 0, multimap().containsKey(key));

# Handbuch für fortgeschrittene Benutzer

## Zusatzfunktionen

Das Haupt-[Tutorial – Benutzerhandbuch](../tutorial/index.md){.internal-link target=_blank} sollte ausreichen, um Ihnen einen Überblick über alle Hauptfunktionen von **FastAPI** zu geben.

In den nächsten Abschnitten sehen Sie weitere Optionen, Konfigurationen und zusätzliche Funktionen.

/// tip | Tipp

Die nächsten Abschnitte sind **nicht unbedingt „fortgeschritten“**.

          .add("mean", mean)
          .add("populationStandardDeviation", populationStandardDeviation())
          .add("min", min)
          .add("max", max)
          .toString();
    } else {
      return MoreObjects.toStringHelper(this).add("count", count).toString();
    }
  }

  double sumOfSquaresOfDeltas() {
    return sumOfSquaresOfDeltas;
  }

  /**

          Object instance = tester.instantiate(classToTest);
          if (instance != null) {
            if (isEqualsDefined(classToTest)) {
              SerializableTester.reserializeAndAssert(instance);
            } else {
              SerializableTester.reserialize(instance);
            }
          }
        } catch (Throwable e) {
          throw sanityError(classToTest, SERIALIZABLE_TEST_METHOD_NAMES, "serializable test", e);

			t.Errorf("Test %d: Decryption returned wrong error code: got %d , want %d", i, err, test.expErr)
		} else if _, enc := crypto.IsEncrypted(test.info.UserDefined); encrypted && enc != encrypted {
			t.Errorf("Test %d: Decryption thinks object is encrypted but it is not", i)
		} else if !encrypted && enc != encrypted {
			t.Errorf("Test %d: Decryption thinks object is not encrypted but it is", i)
		}
	}
}

	var zb0004 uint32
	zb0004, err = dc.ReadMapHeader()
	if err != nil {
		err = msgp.WrapError(err)
		return
	}
	if (*z) == nil {
		(*z) = make(DailyAllTierStats, zb0004)
	} else if len((*z)) > 0 {
		for key := range *z {
			delete((*z), key)
		}
	}
	var field []byte
	_ = field
	for zb0004 > 0 {
		zb0004--
		var zb0001 string
		var zb0002 lastDayTierStats

            final ZonedDateTime zdt = ZonedDateTime.of(ldt, ZoneId.systemDefault());
            super.addFieldToSource(sourceMap, field, DateTimeFormatter.ISO_INSTANT.format(zdt));
        } else {
            super.addFieldToSource(sourceMap, field, value);
        }
    }

    @Override
    public String toString() {

        final WebApiManager webApiManager = webApiManagerFactory.get((HttpServletRequest) request);
        if (webApiManager == null) {
            chain.doFilter(request, response);
        } else {
            webApiManager.process((HttpServletRequest) request, (HttpServletResponse) response, chain);
        }
    }