}

  // Inner Classes

  /**
   * Segments are specialized versions of hash tables. This subclass inherits from ReentrantLock
   * opportunistically, just to simplify some locking and avoid separate construction.
   */
  @SuppressWarnings("serial") // This class is never serialized.
  static final class Segment<K, V> extends ReentrantLock {

    /*

* [AppArmor] Hold bad AppArmor pods in pending rather than rejecting ([#35342](https://github.com/kubernetes/kubernetes/pull/35342), [@timstclair](https://github.com/timstclair))
* Federation: separate notion of zone-name & dns-suffix ([#35372](https://github.com/kubernetes/kubernetes/pull/35372), [@justinsb](https://github.com/justinsb))

  }

  /**
   * Returns a string containing the supplied {@code boolean} values separated by {@code separator}.
   * For example, {@code join("-", false, true, false)} returns the string {@code
   * "false-true-false"}.
   *
   * @param separator the text that should appear between consecutive values in the resulting string
   *     (but not at the start or end)

  }

  /**
   * Returns a string containing the supplied {@code boolean} values separated by {@code separator}.
   * For example, {@code join("-", false, true, false)} returns the string {@code
   * "false-true-false"}.
   *
   * @param separator the text that should appear between consecutive values in the resulting string
   *     (but not at the start or end)

* Laid the groundwork for OIDC distributed claims handling in the apiserver authentication token checker. A distributed claim allows the OIDC provider to delegate a claim to a separate URL. ([ref](http://openid.net/specs/openid-connect-core-1_0.html#AggregatedDistributedClaims)). ([#63213](https://github.com/kubernetes/kubernetes/pull/63213), [@filmil](https://github.com/filmil))

   */
  public static String join(String separator, char... array) {
    checkNotNull(separator);
    int len = array.length;
    if (len == 0) {
      return "";
    }

    StringBuilder builder = new StringBuilder(len + separator.length() * (len - 1));
    builder.append(array[0]);
    for (int i = 1; i < len; i++) {
      builder.append(separator).append(array[i]);
    }
    return builder.toString();

    }

    @Test
    @DisplayName("Should handle special characters in delimiter")
    void testJoinWithSpecialCharDelimiter() {
        String result = StringUtil.join("\\t", "tab", "separated", "values");
        assertEquals("tab\\tseparated\\tvalues", result);
    }

    @Test
    @DisplayName("Should handle Unicode characters in delimiter")
    void testJoinWithUnicodeDelimiter() {

  }

  /**
   * Returns a string containing the supplied {@code short} values separated by {@code separator}.
   * For example, {@code join("-", (short) 1, (short) 2, (short) 3)} returns the string {@code
   * "1-2-3"}.
   *
   * @param separator the text that should appear between consecutive values in the resulting string
   *     (but not at the start or end)

  }

  /**
   * Returns a string containing the supplied {@code short} values separated by {@code separator}.
   * For example, {@code join("-", (short) 1, (short) 2, (short) 3)} returns the string {@code
   * "1-2-3"}.
   *
   * @param separator the text that should appear between consecutive values in the resulting string
   *     (but not at the start or end)

* kube-up: install new Docker pre-requisite (libltdl7) when not in image ([#28745](https://github.com/kubernetes/kubernetes/pull/28745), [@justinsb](https://github.com/justinsb))
* Separate rate limiters for Pod evictions for different zones in NodeController ([#28843](https://github.com/kubernetes/kubernetes/pull/28843), [@gmarek](https://github.com/gmarek))