final Date date = format.parse(str, pos);
        if (date == null) {
            return null;
        }
        final int index = pos.getIndex();
        if (index == 0) {
            return null;
        }
        if (index < str.length()) {
            return null;
        }
        return date;
    }

    /**

    protected void assertObjectNotNull(String variableName, Object value) {
        if (variableName == null) {
            String msg = "The value should not be null: variableName=null value=" + value;
            throw new IllegalArgumentException(msg);
        }
        if (value == null) {
            String msg = "The value should not be null: variableName=" + variableName;
            throw new IllegalArgumentException(msg);
        }

        } catch (final MissingResourceException ignore) {
            return null;
        }
    }

    /**
     * Returns the bundle. Returns <code>null</code> if not found.
     *
     * @param name the resource bundle name (must not be {@literal null} or empty)
     * @param locale the locale
     * @param classLoader the class loader (must not be {@literal null} or empty)
     * @return {@link ResourceBundle}

      int size = (keyList == null) ? 0 : keyList.count;
      checkPositionIndex(index, size);
      if (index >= (size / 2)) {
        previous = (keyList == null) ? null : keyList.tail;
        nextIndex = size;
        while (index++ < size) {
          previous();
        }
      } else {
        next = (keyList == null) ? null : keyList.head;
        while (index-- > 0) {
          next();

        if (methodDescs == null) {
            return null;
        }
        for (final MethodDesc methodDesc : methodDescs) {
            if (Arrays.equals(paramTypes, methodDesc.getParameterTypes())) {
                return methodDesc;
            }
        }
        return null;
    }

    @Override

            if (labelValueMap != null) {
                return labelValueMap.get(value);
            }
            return null;
        }).orElse(value);
    }

    /**
     * Converts a Long timestamp to a Date object.
     *
     * @param value the timestamp in milliseconds
     * @return Date object representing the timestamp, or null if value is null
     */

      return;
    }

    map.put(null, unmappedValue);
    assertEquals(unmappedValue, map.get(null));
    assertTrue(map.containsKey(null));
    Entry<@Nullable K, V> entry = mapEntry(null, unmappedValue);
    assertTrue(entrySet.remove(entry));
    assertNull(map.get(null));
    assertFalse(map.containsKey(null));
  }

  public void testEntrySetRemoveNullKeyMissing() {

            return null;
        }
        synchronized (this.addressCache) {
            CacheEntry entry = this.addressCache.get(hostName);
            if (entry != null && entry.expiration < System.currentTimeMillis() && entry.expiration >= 0) {
                entry = null;
            }
            return entry != null ? entry.address : null;
        }
    }

    int getNextNameTrnId() {

      Set<Object> keys = cache.asMap().keySet();
      assertThat(keys.remove(null)).isFalse();
      assertThat(keys.remove(6)).isFalse();
      assertThat(keys.remove(-6)).isFalse();
      assertThat(keys.removeAll(asList(null, 0, 15, 1500))).isFalse();
      assertThat(keys.retainAll(asList(null, 0, 15, 1500))).isFalse();
      checkEmpty(keys);
      checkEmpty(cache);
    }
  }

      Set<Object> keys = cache.asMap().keySet();
      assertThat(keys.remove(null)).isFalse();
      assertThat(keys.remove(6)).isFalse();
      assertThat(keys.remove(-6)).isFalse();
      assertThat(keys.removeAll(asList(null, 0, 15, 1500))).isFalse();
      assertThat(keys.retainAll(asList(null, 0, 15, 1500))).isFalse();
      checkEmpty(keys);
      checkEmpty(cache);
    }
  }