return (ImmutableSet<E>) RegularImmutableSet.EMPTY;
  }

  /**
   * Returns an immutable set containing the given element. Preferred over {@link
   * Collections#singleton} for code consistency, {@code null} rejection, and because the return
   * type conveys the immutability guarantee.
   */
  public static <E> ImmutableSet<E> of(E e1) {
    return new SingletonImmutableSet<>(e1);
  }

  /**

      // already started execution. Because each task on a TaskNonReentrantExecutor can only produce
      // one execute() call to another instance from the same ExecutionSequencer, we know by
      // induction that the task that launched this one must not have added any other runnables to
      // that thread's queue, and thus we cannot be replacing a TaskAndThread object that would

 * average, in the marking phase, not {@code 5.0} as in {@code java.util.HashSet}.
 *
 * <p>If there are no removals, then {@link #iterator iteration} order is the same as insertion
 * order. Any removal invalidates any ordering guarantees.
 *
 * <p>This class should not be assumed to be universally superior to {@code java.util.HashSet}.

 * but given that any public suffix may become a host without warning, it is better to err on the
 * side of permissiveness and thus avoid spurious rejection of valid sites. Of course, to actually
 * determine addressability of any host, clients of this class will need to perform their own DNS
 * lookups.
 *
 * <p>During construction, names are normalized in two ways:
 *

 * terms</a>):
 *
 * <ul>
 *   <li>directed graphs
 *   <li>undirected graphs
 *   <li>graphs that do/don't allow parallel edges
 *   <li>graphs that do/don't allow self-loops
 *   <li>graphs whose nodes/edges are insertion-ordered, sorted, or unordered
 *   <li>graphs whose edges are <a
 *       href="https://github.com/google/guava/wiki/GraphsExplained#uniqueness">unique</a> objects
 * </ul>
 *
 * <h3>Building a {@code Network}</h3>
 *

* Cómo establecer **restricciones de validación** como `maximum_length` o `regex`.
* Un sistema de **<dfn title="también conocido como: componentes, recursos, proveedores, servicios, inyectables">Inyección de Dependencias</dfn>** muy poderoso y fácil de usar.
* Seguridad y autenticación, incluyendo soporte para **OAuth2** con **tokens JWT** y autenticación **HTTP Basic**.

import org.apache.maven.cling.logging.Slf4jConfiguration;
import org.apache.maven.cling.logging.Slf4jConfigurationFactory;
import org.apache.maven.cling.logging.Slf4jLoggerManager;
import org.apache.maven.di.Injector;
import org.apache.maven.eventspy.internal.EventSpyDispatcher;
import org.apache.maven.exception.DefaultExceptionHandler;
import org.apache.maven.exception.ExceptionHandler;
import org.apache.maven.exception.ExceptionSummary;

* Comment définir des **contraintes de validation** comme `maximum_length` ou `regex`.
* Un système **<dfn title="également connu sous le nom de : composants, ressources, fournisseurs, services, injectables">d'injection de dépendances</dfn>** très puissant et facile à utiliser.
* Sécurité et authentification, y compris la prise en charge de **OAuth2** avec des **JWT tokens** et l'authentification **HTTP Basic**.

    }

    // Explicitly call `equals`; `assertEquals` might return fast
    assertTrue(map.equals(map));
    assertTrue(makePopulatedMap().equals(map));
    assertFalse(map.equals(emptyMap()));
    // no-inspection ObjectEqualsNull
    assertFalse(map.equals(null));
  }

  public void testEqualsForLargerMap() {
    if (!supportsPut) {
      return;
    }

    Map<K, V> map;
    Map<K, V> largerMap;

 * collector by only using a constant number of internal objects.
 *
 * <p>If there are no removals, then iteration order for the {@link #entrySet}, {@link #keySet}, and
 * {@link #values} views is the same as insertion order. Any removal invalidates any ordering
 * guarantees.
 *
 * <p>This class should not be assumed to be universally superior to {@code java.util.HashMap}.