*
 * <p>As an example, imagine that we have a list of tasks to execute, but we don't want to submit
 * more than 2 per second:
 *
 * {@snippet :
 * final RateLimiter rateLimiter = RateLimiter.create(2.0); // rate is "2 permits per second"
 * void submitTasks(List<Runnable> tasks, Executor executor) {
 *   for (Runnable task : tasks) {
 *     rateLimiter.acquire(); // may wait

   * Support class for {@link MoreObjects#toStringHelper}.
   *
   * @author Jason Lee
   * @since 18.0 (since 2.0 as {@code Objects.ToStringHelper}).
   */
  public static final class ToStringHelper {
    private final String className;
    private final ValueHolder holderHead = new ValueHolder();
    private ValueHolder holderTail = holderHead;
    private boolean omitNullValues = false;
    private boolean omitEmptyValues = false;

 *
 * @author Jared Levy
 * @since 2.0
 */
@GwtCompatible
public final class HashMultimap<K extends @Nullable Object, V extends @Nullable Object>
    extends AbstractSetMultimap<K, V> {
  private static final int DEFAULT_VALUES_PER_KEY = 2;

  @VisibleForTesting transient int expectedValuesPerKey = DEFAULT_VALUES_PER_KEY;

  /**

import org.apache.maven.plugin.MojoExecution;
import org.apache.maven.project.MavenProject;

public class BuildPlan {

    private final Map<MavenProject, Map<String, BuildStep>> plan = new LinkedHashMap<>();
    private final Map<MavenProject, List<MavenProject>> projects;
    private final Map<String, String> aliases = new HashMap<>();
    private volatile Set<String> duplicateIds;
    private volatile List<BuildStep> sortedNodes;

    //                                                                          Definition
    //                                                                          ==========
    private static final long serialVersionUID = 1L;
    protected static final Class<?> suppressUnusedImportLocalDateTime = LocalDateTime.class;

    // ===================================================================================

 *
 * @author Robert Konigsberg
 * @author Hayward Chan
 * @author Louis Wasserman
 */
@NullUnmarked
public class ForwardingCollectionTest extends TestCase {
  static final class StandardImplForwardingCollection<T> extends ForwardingCollection<T> {
    private final Collection<T> backingCollection;

    StandardImplForwardingCollection(Collection<T> backingCollection) {
      this.backingCollection = backingCollection;
    }

 *
 * @author Robert Konigsberg
 * @author Louis Wasserman
 */
@NullUnmarked
public class ForwardingQueueTest extends TestCase {

  static final class StandardImplForwardingQueue<T> extends ForwardingQueue<T> {
    private final Queue<T> backingQueue;

    StandardImplForwardingQueue(Queue<T> backingQueue) {
      this.backingQueue = backingQueue;
    }

    @Override

 *
 * @author Alan Green
 * @author Sebastian Kanthak
 * @since 1.0
 */
@J2ktIncompatible
@GwtIncompatible
final class AppendableWriter extends Writer {
  private final Appendable target;
  private boolean closed;

  /**
   * Creates a new writer that appends everything it writes to {@code target}.
   *
   * @param target target to which to append output

        }

        private static class DefaultVersionResolverRequest extends BaseRequest<Session>
                implements VersionResolverRequest {
            private final ArtifactCoordinates artifactCoordinates;
            private final List<RemoteRepository> repositories;

            @SuppressWarnings("checkstyle:ParameterNumber")
            DefaultVersionResolverRequest(
                    @Nonnull Session session,

@GwtCompatible
@NullMarked
public abstract class TestMapEntrySetGenerator<
        K extends @Nullable Object, V extends @Nullable Object>
    implements TestSetGenerator<Map.Entry<K, V>> {
  private final SampleElements<K> keys;
  private final SampleElements<V> values;

  protected TestMapEntrySetGenerator(SampleElements<K> keys, SampleElements<V> values) {
    this.keys = keys;
    this.values = values;
  }

  @Override