guava/src/com/google/common/collect/ForwardingMultiset.java
@Beta
  protected int standardCount(@Nullable Object object) {
    for (Entry<?> entry : this.entrySet()) {
      if (Objects.equal(entry.getElement(), object)) {
        return entry.getCount();
      }
    }
    return 0;
  }
@Beta
  protected int standardCount(@Nullable Object object) {
    for (Entry<?> entry : this.entrySet()) {
      if (Objects.equal(entry.getElement(), object)) {
        return entry.getCount();
      }
    }
    return 0;
  }
A sensible, albeit inefficient, definition of {@link #count} in terms of {@link #entrySet}. If
you override {@link #entrySet}, you may wish to override {@link #count} to forward to this
implementation.

@since 7.0