*
     * <pre>
     * ObjectUtil.equals(null, null)                  = true
     * ObjectUtil.equals(null, "")                    = false
     * ObjectUtil.equals("", null)                    = false
     * ObjectUtil.equals("", "")                      = true
     * ObjectUtil.equals(Boolean.TRUE, null)          = false
     * ObjectUtil.equals(Boolean.TRUE, "true")        = false
     * ObjectUtil.equals(Boolean.TRUE, Boolean.TRUE)  = true

      this.backingSet = backingSet;
    }

    @Override
    protected NavigableSet<T> delegate() {
      return backingSet;
    }

    @Override
    public boolean equals(@Nullable Object object) {
      return standardEquals(object);
    }

    @Override
    public int hashCode() {
      return standardHashCode();
    }

    @Override

   *
   * <p>This implementation returns {@code true} if {@code object} is a multiset of the same size
   * and if, for each element, the two multisets have the same count.
   */
  @Override
  public final boolean equals(@CheckForNull Object object) {
    return Multisets.equalsImpl(this, object);
  }

  /**
   * {@inheritDoc}
   *
   * <p>This implementation returns the hash code of {@link Multiset#entrySet()}.
   */

  @Override
  public boolean equals(@CheckForNull Object object) {
    if (object == this) {
      return true;
    }
    if (object instanceof BloomFilter) {
      BloomFilter<?> that = (BloomFilter<?>) object;
      return this.numHashFunctions == that.numHashFunctions
          && this.funnel.equals(that.funnel)
          && this.bits.equals(that.bits)
          && this.strategy.equals(that.strategy);
    }

            if (URL_ELEMENT.equals(qName)) {
                sitemapUrl = new SitemapUrl();
            } else if (LOC_ELEMENT.equals(qName) || LASTMOD_ELEMENT.equals(qName) || CHANGEFREQ_ELEMENT.equals(qName)
                    || PRIORITY_ELEMENT.equals(qName)) {
                buf = new StringBuilder();
            }
        }

        @Override

        assertTrue(stemmerOverrideItem1.equals(stemmerOverrideItem1));
        assertTrue(stemmerOverrideItem1.equals(new StemmerOverrideItem(1, "aaa", "a")));
        assertTrue(stemmerOverrideItem1.equals(new StemmerOverrideItem(2, "aaa", "a")));
        assertFalse(stemmerOverrideItem1.equals(new StemmerOverrideItem(1, "aaa", "b")));
        assertFalse(stemmerOverrideItem1.equals(new StemmerOverrideItem(2, "bbb", "a")));

      monitor.leave();
    }
  }

  /**
   * Removes a single instance of the specified element from this queue, if it is present. More
   * formally, removes an element {@code e} such that {@code o.equals(e)}, if this queue contains
   * one or more such elements. Returns {@code true} if this queue contained the specified element
   * (or equivalently, if this queue changed as a result of the call).
   *

    @Override
    Set<E> delegate() {
      return (Set<E>) super.delegate();
    }

    @Override
    public boolean equals(@CheckForNull Object o) {
      if (o == this) {
        return true;
      }
      synchronized (mutex) {
        return delegate().equals(o);
      }
    }

    @Override
    public int hashCode() {
      synchronized (mutex) {
        return delegate().hashCode();

    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }

        UpgradedProperty that = (UpgradedProperty) o;

    assertEquals(Sets.newTreeSet(asList("a", "b", "c")), set);
    assertFalse(set.equals(Sets.newTreeSet(asList("a", "b", "d"))));
    assertFalse(Sets.newTreeSet(asList("a", "b", "d")).equals(set));
    assertFalse(set.equals(newHashSet(4, 5, 6)));
    assertFalse(newHashSet(4, 5, 6).equals(set));
  }

  public void testEquals_bothExplicitOrdering() {
    SortedSet<String> set = of("in", "the", "a");