*/
  @Override
  public abstract boolean equals(@CheckForNull Object object);

  /**
   * Returns a hash code for this instance.
   *
   * <p><b>Comparison to {@code java.util.Optional}:</b> this class leaves the specific choice of
   * hash code unspecified, unlike the Java 8+ equivalent.
   */
  @Override
  public abstract int hashCode();

  /**

      return new SampleElements<>(114, 37, 42, 19, 82);
    }
  }

  abstract static class FilteredSetMultimapGenerator
      extends TestFilteredMultimapGenerator<SetMultimap<String, Integer>>
      implements TestSetMultimapGenerator<String, Integer> {

    abstract SetMultimap<String, Integer> filter(SetMultimap<String, Integer> multimap);

    @Override

            return 1;
        } finally {
            if (classWorldManaged) {
                classWorld.close();
            }
        }
    }

    protected abstract Invoker<R> createInvoker();

    protected abstract R parseArguments(String[] args) throws ParserException, IOException;

import org.codehaus.plexus.logging.AbstractLogEnabled;

/**
 * Describes a version transformation during artifact resolution.
 *
 * TODO try and refactor to remove abstract methods - not particular happy about current design
 */
@Deprecated
public abstract class AbstractVersionTransformation extends AbstractLogEnabled implements ArtifactTransformation {
    @Inject
    protected RepositoryMetadataManager repositoryMetadataManager;

    return emptySet();
  }

  @Retention(RetentionPolicy.RUNTIME)
  @Inherited
  @TesterAnnotation
  public @interface Require {
    public abstract MultisetFeature[] value() default {};

    public abstract MultisetFeature[] absent() default {};
  }

import org.apache.maven.model.Profile;

/**
 * DetectedProfileActivator
 */
@Deprecated
public abstract class DetectedProfileActivator implements ProfileActivator {
    public boolean canDetermineActivation(Profile profile) {
        return canDetectActivation(profile);
    }

    protected abstract boolean canDetectActivation(Profile profile);

 *
 * @author Gregory Kick
 */
@GwtCompatible
@ElementTypesAreNonnullByDefault
abstract class RegularImmutableTable<R, C, V> extends ImmutableTable<R, C, V> {
  RegularImmutableTable() {}

  abstract Cell<R, C, V> getCell(int iterationIndex);

  @Override
  final ImmutableSet<Cell<R, C, V>> createCellSet() {

 *
 * @author Chris Povirk
 * @author Jared Levy
 */
@GwtCompatible
@ElementTypesAreNonnullByDefault
public abstract class TestIntegerSortedSetGenerator extends TestIntegerSetGenerator {
  @Override
  protected abstract SortedSet<Integer> create(Integer[] elements);

  /** Sorts the elements by their natural ordering. */
  @Override

import com.google.common.collect.testing.SampleElements.Enums;
import java.util.List;
import java.util.Set;

/**
 * An abstract TestSetGenerator for generating sets containing enum values.
 *
 * @author Kevin Bourrillion
 */
@GwtCompatible
@ElementTypesAreNonnullByDefault
public abstract class TestEnumSetGenerator implements TestSetGenerator<AnEnum> {
  @Override
  public SampleElements<AnEnum> samples() {

    return implied;
  }

  @Retention(RetentionPolicy.RUNTIME)
  @Inherited
  @TesterAnnotation
  public @interface Require {
    public abstract MultimapFeature[] value() default {};

    public abstract MultimapFeature[] absent() default {};
  }