/**
   * Verify thread safety by using a collection whose size() may be inconsistent with the actual
   * number of elements and whose elements may change over time.
   *
   * <p>This test might fail in GWT because the GWT emulations might count on the input collection
   * not to change during the copy. It is safe to do so in GWT because javascript is
   * single-threaded.
   */
  @GwtIncompatible // GWT is single threaded

    assertThat(Comparators.max(1, 2, reverse)).isEqualTo(1);
    assertThat(Comparators.max(2, 1, reverse)).isEqualTo(1);
  }

  /**
   * Fails compilation if the signature of min and max is changed to take {@code Comparator<T>}
   * instead of {@code Comparator<? super T>}.
   */
  public void testMinMaxWithSupertypeComparator() {
    Comparator<Number> numberComparator =

        if (collection.size() == entry.getValue().size()) {
          entryIterator.remove();
        } else {
          collection.clear();
        }
        changed = true;
      }
    }
    return changed;
  }

  @WeakOuter
  class AsMap extends ViewCachingAbstractMap<K, Collection<V>> {
    @Override
    public boolean containsKey(@CheckForNull Object key) {

      List<E> list, int index, Iterable<? extends E> elements) {
    boolean changed = false;
    ListIterator<E> listIterator = list.listIterator(index);
    for (E e : elements) {
      listIterator.add(e);
      changed = true;
    }
    return changed;
  }

  /** An implementation of {@link List#indexOf(Object)}. */

package com.google.common.graph;

import com.google.common.annotations.Beta;
import java.util.Set;

/**
 * Supertype for {@link Graphs}, containing the old signatures of methods whose signatures we've
 * changed. This provides binary compatibility for users who compiled against the old signatures.
 */
@Beta
@ElementTypesAreNonnullByDefault
abstract class GraphsBridgeMethods {

  @SuppressWarnings("PreferredInterfaceType")

      (a) You must give any other recipients of the Work or
          Derivative Works a copy of this License; and

      (b) You must cause any modified files to carry prominent notices
          stating that You changed the files; and

      (c) You must retain, in the Source form of any Derivative Works
          that You distribute, all copyright, patent, trademark, and
          attribution notices from the Source form of the Work,

   * of the chars.
   *
   * <p>Additionally, for mutable sources such as {@code StringBuilder}s, a subsequent read may
   * return a different number of chars if the contents are changed.
   *
   * @since 19.0
   */
  public Optional<Long> lengthIfKnown() {
    return Optional.absent();
  }

  /**

    return true;
  }

  // Bulk Operations

  /**
   * {@inheritDoc}
   *
   * <p>If any entries for the specified {@code key} already exist in the multimap, their values are
   * changed in-place without affecting the iteration order.
   *
   * <p>The returned list is immutable and implements {@link java.util.RandomAccess}.
   */
  @CanIgnoreReturnValue
  @Override

   * each given element has increased by one since the test collection was created, and the number
   * of occurrences of all other elements has not changed.
   *
   * <p>Note: This means that a test like the following will fail if {@code collection} is a {@code
   * Set}:
   *
   * <pre>
   * collection.add(existingElement);

public class AbstractSetTester<E> extends AbstractCollectionTester<E> {
  /*
   * Previously we had a field named set that was initialized to the value of
   * collection in setUp(), but that caused problems when a tester changed the
   * value of set or collection but not both.
   */
  protected final Set<E> getSet() {
    return (Set<E>) collection;
  }