ToIntFunction<? super T> countFunction) {
    return CollectCollectors.toImmutableMultiset(elementFunction, countFunction);
  }

  /**
   * Returns the empty immutable multiset.
   *
   * <p><b>Performance note:</b> the instance returned is a singleton.
   */
  @SuppressWarnings("unchecked") // all supported methods are covariant
  public static <E> ImmutableMultiset<E> of() {

     */
    protected String algorithm = BLOWFISH;

    /**
     * The transformation to use for the cipher when using Key objects.
     * Default is Blowfish to match the algorithm default.
     * <p>
     * Note: For better security, consider using "AES/GCM/NoPadding" with proper IV handling.
     * </p>
     */
    protected String transformation = BLOWFISH;

    /**
     * The key to use for encryption/decryption.

    /**
     * Test isSortField with empty array - should return false, not throw exception.
     * This test addresses the Copilot AI concern about empty arrays.
     */
    @Test
    public void test_isSortField_withEmptyArray_returnsFalse() {
        String[] emptyFields = {};
        queryFieldConfig.setSortFields(emptyFields);

        // Set should be empty but not null
        assertNotNull(queryFieldConfig.sortFieldSet);

          override fun encode(
            writer: DerWriter,
            value: String,
          ) = writer.writeUtf8(value)
        },
    )

  /**
   * Based on International Alphabet No. 5. Note that there are bytes that IA5 and US-ASCII
   * disagree on interpretation.
   *
   * TODO(jwilson): constrain to IA5 characters.
   */
  val IA5_STRING =
    BasicDerAdapter(
      name = "IA5 STRING",

   * @param radix the radix to use while parsing {@code string}
   * @throws NumberFormatException if the string does not contain a valid unsigned {@code long} with
   *     the given radix, or if {@code radix} is not between {@link Character#MIN_RADIX} and {@link
   *     Character#MAX_RADIX}.
   * @throws NullPointerException if {@code string} is null (in contrast to {@link

```

这表示 `item` 可以是 `int` 或 `str`。

#### 可能为 `None` { #possibly-none }

你可以声明一个值的类型是某种类型（比如 `str`），但它也可能是 `None`。

//// tab | Python 3.10+

```Python hl_lines="1"
{!> ../../docs_src/python_types/tutorial009_py310.py!}
```

////

使用 `str | None` 而不是仅仅 `str`，可以让编辑器帮助你发现把值当成总是 `str` 的错误（实际上它也可能是 `None`）。

### 类作为类型 { #classes-as-types }

你也可以把类声明为变量的类型。

	g := errgroup.WithNErrs(len(sys.peerClients))
	peerChannels := make([]<-chan madmin.ReplicationMRF, len(sys.peerClients))
	for index, client := range sys.peerClients {
		if client == nil {
			continue
		}
		host := client.host.String()
		if host != node && node != "all" {
			continue
		}
		index := index

        }
    }

    @Test
    public void test_validate_noError() {
        // Test validate when no error is set
        // This should not throw exception
        try {
            WebApiUtil.validate();
        } catch (WebApiException e) {
            fail("validate should not throw exception when no error is set");
        }
    }

    @Test
    public void test_constructor_isPrivate() {

        // Set buffer length for two entries
        SMBUtil.writeInt4(208, buffer, bufferIndex + 4);

        response = spy(response);
        when(response.getHeaderStart()).thenReturn(0);

        // Note: Due to bug in line 96 (commented out bufferIndex = bufferOffset),
        // the decode starts at bufferIndex=8 instead of dataOffset=80
        // So we need to write data at bufferIndex=8

* `Field(primary_key=True)` tells SQLModel that the `id` is the **primary key** in the SQL database (you can learn more about SQL primary keys in the SQLModel docs).