Here’s a [sample event listener](https://github.com/square/okhttp/blob/master/samples/guide/src/main/java/okhttp3/recipes/PrintEventsNonConcurrent.java) that prints each event with a timestamp.

```java
class PrintingEventListener extends EventListener {
  private long callStartNanos;

  private void printEvent(String name) {
    long nowNanos = System.nanoTime();
    if (name.equals("callStart")) {
      callStartNanos = nowNanos;
    }

 * of the public API. In particular, this class can be changed or deleted without prior notice.
 *
 */
@Deprecated
public final class MetadataBridge extends AbstractMetadata implements MergeableMetadata {

    private ArtifactMetadata metadata;

    private boolean merged;

    public MetadataBridge(ArtifactMetadata metadata) {
        this.metadata = metadata;
    }

          K0 extends @Nullable Object, V0 extends @Nullable Object>
      extends MultimapBuilder<K0, V0> {
    ListMultimapBuilder() {}

    @Override
    public abstract <K extends K0, V extends V0> ListMultimap<K, V> build();

    @Override
    public <K extends K0, V extends V0> ListMultimap<K, V> build(
        Multimap<? extends K, ? extends V> multimap) {

          K0 extends @Nullable Object, V0 extends @Nullable Object>
      extends MultimapBuilder<K0, V0> {
    ListMultimapBuilder() {}

    @Override
    public abstract <K extends K0, V extends V0> ListMultimap<K, V> build();

    @Override
    public <K extends K0, V extends V0> ListMultimap<K, V> build(
        Multimap<? extends K, ? extends V> multimap) {

 * This class handles the response from a TRANS2_QUERY_FS_INFORMATION request,
 * returning various file system information levels such as volume size and attributes.
 */
public class Trans2QueryFSInformationResponse extends SmbComTransactionResponse {

    private final int informationLevel;
    private FileSystemInformation info;

    /**

abstract class AbstractTransformFuture<
        I extends @Nullable Object, O extends @Nullable Object, F, T extends @Nullable Object>
    extends FluentFuture.TrustedFuture<O> implements Runnable {
  static <I extends @Nullable Object, O extends @Nullable Object> ListenableFuture<O> createAsync(
      ListenableFuture<I> input,
      AsyncFunction<? super I, ? extends O> function,
      Executor executor) {

     */
    @CanIgnoreReturnValue
    public <T extends B> Builder<B> putAll(Map<? extends Class<? extends T>, ? extends T> map) {
      for (Entry<? extends Class<? extends T>, ? extends T> entry : map.entrySet()) {
        Class<? extends T> type = entry.getKey();
        T value = entry.getValue();
        mapBuilder.put(type, cast(type, value));
      }

    // ? extends Number
    assertAssignable(new TypeToken<List<N1>>() {}, new TypeToken<List<? extends Number>>() {});
    assertAssignable(new TypeToken<ArrayList<N1>>() {}, new TypeToken<List<? extends Number>>() {});
    assertAssignable(
        new TypeToken<List<? extends N11>>() {}, new TypeToken<List<? extends Number>>() {});
  }

  public <N1 extends Number, N2 extends Number, N11 extends N1>

public final class CollectorTester<
    T extends @Nullable Object, A extends @Nullable Object, R extends @Nullable Object> {
  /**
   * Creates a {@code CollectorTester} for the specified {@code Collector}. The result of the {@code
   * Collector} will be compared to the expected value using {@link Object#equals}.
   */
  public static <T extends @Nullable Object, A extends @Nullable Object, R extends @Nullable Object>

    abstract class Retailer<ProductT> extends Shop<ProductT>
        implements Comparator<ProductT>, ConsumerFacing<ProductT> {}
  }

  private static class Outlet<T> extends Mall<T> {}

  private interface UseIterable<T extends Iterable<?>> {}

  private interface UseSerializableIterable<T extends Serializable & Iterable<?>> {}

  private interface UseList<T extends List<?>> {}

  private enum MyEnum {}