public abstract boolean matches(char c);

  // Non-static factories

  /** Returns a matcher that matches any character not matched by this matcher. */
  // @Override under Java 8 but not under Java 7
  public CharMatcher negate() {
    return new Negated(this);
  }

  /**
   * Returns a matcher that matches any character matched by both this matcher and {@code other}.
   */

  public abstract boolean matches(char c);

  // Non-static factories

  /** Returns a matcher that matches any character not matched by this matcher. */
  // @Override under Java 8 but not under Java 7
  @Override
  public CharMatcher negate() {
    return new Negated(this);
  }

  /**
   * Returns a matcher that matches any character matched by both this matcher and {@code other}.

  }

  /**
   * Creates an empty {@code Set} that uses identity to determine equality. It compares object
   * references, instead of calling {@code equals}, to determine whether a provided object matches
   * an element in the set. For example, {@code contains} returns {@code false} when passed an
   * object that equals a set member, but isn't the same instance. This behavior is similar to the

   * exception, every unchecked exception as an unchecked exception, and every error as an error. In
   * addition, the cause of any {@code ExecutionException} is wrapped in order to ensure that the
   * new stack trace matches that of the current thread.
   *
   * <p>Instances of {@code exceptionClass} are created by choosing an arbitrary public constructor
   * that accepts zero or more arguments, all of type {@code String} or {@code Throwable}

   * possible that <i>no</i> element will match, use {@link #tryFind} or {@link #find(Iterator,
   * Predicate, Object)} instead.
   *
   * @throws NoSuchElementException if no element in {@code iterator} matches the given predicate
   */
  @ParametricNullness
  public static <T extends @Nullable Object> T find(
      Iterator<T> iterator, Predicate<? super T> predicate) {
    checkNotNull(iterator);

    // Every bound must match. On any false, result is false.
    return new Bounds(bounds, false);
  }

  private static Bounds any(Type[] bounds) {
    // Any bound matches. On any true, result is true.
    return new Bounds(bounds, true);
  }

  private static class Bounds {
    private final Type[] bounds;
    private final boolean target;

   * possible that <i>no</i> element will match, use {@link #tryFind} or {@link #find(Iterator,
   * Predicate, Object)} instead.
   *
   * @throws NoSuchElementException if no element in {@code iterator} matches the given predicate
   */
  @ParametricNullness
  public static <T extends @Nullable Object> T find(
      Iterator<T> iterator, Predicate<? super T> predicate) {
    checkNotNull(iterator);