@GwtCompatible
final class Absent<T> extends Optional<T> {
  static final Absent<Object> INSTANCE = new Absent<>();

  @SuppressWarnings("unchecked") // implementation is "fully variant"
  static <T> Optional<T> withType() {
    return (Optional<T>) INSTANCE;
  }

  private Absent() {}

  @Override
  public boolean isPresent() {
    return false;
  }

  @Override

<div class="termy">

```console
$ pip install "fastapi[standard]"

---> 100%
```

</div>

////

//// tab | `uv`

Si vous avez [`uv`](https://github.com/astral-sh/uv) :

<div class="termy">

```console
$ uv pip install "fastapi[standard]"
---> 100%
```

</div>

////

### Installer depuis `requirements.txt` { #install-from-requirements-txt }

                assertFalse(iterator2.hasNext(), "Second instance should have no elements");
                assertFalse(iterator3.hasNext(), "Third instance should have no elements");

                assertNull(iterator1.next(), "First instance next() should return null");
                assertNull(iterator2.next(), "Second instance next() should return null");

        // nothing
    }

    /**
     * Creates a {@link StreamOf} instance from the provided values.
     * If the input array is {@code null}, an empty stream is returned.
     *
     * @param <T> The type of elements in the stream.
     * @param values The elements to be included in the stream. Can be {@code null}.
     * @return A {@link StreamOf} instance containing the provided values, or an empty stream if {@code values} is {@code null}.

    }

    @Test
    @DisplayName("getConfig should return the provided configuration")
    void testGetConfig() {
        // When
        Configuration config = context.getConfig();

        // Then
        assertSame(mockConfig, config, "Should return the same configuration instance");
    }

    @Test

          distribution: 'temurin'

      - name: Install Graphviz (MacOS)
        if: runner.os == 'macOS'
        run: brew install graphviz

      - name: Install Graphviz (Ubuntu)
        if: runner.os == 'Linux'
        run: sudo apt-get install graphviz

      - name: Install Graphviz (Windows)
        if: runner.os == 'Windows'
        run: choco install graphviz

      - name: Checkout maven

  }

  private static GetCheckedTypeValidator nonCachingWithoutConstructorCheckValidator() {
    return NonCachingWithoutConstructorCheckValidator.INSTANCE;
  }

  private enum NonCachingWithoutConstructorCheckValidator implements GetCheckedTypeValidator {
    INSTANCE;

    @Override
    public void validateClass(Class<? extends Exception> exceptionClass) {
      checkArgument(

        // Act & Assert
        // unwrap to interface itself should return same instance
        CredentialsInternal unwrapped = creds.unwrap(CredentialsInternal.class);
        assertNotNull(unwrapped, "unwrap to CredentialsInternal returns instance");
        assertSame(creds, unwrapped, "unwrap returns the same object instance");

        // unwrap to unrelated type should return null (use another Credentials implementation)

      uses: actions/checkout@v4
      with:
        repository: codelibs/fess-parent
        ref: ${{ env.PARENT_BRANCH }}
        path: fess-parent
    - name: Install fess-parent
      run: |
        cd fess-parent
        mvn install -Dgpg.skip=true
    - name: Build with Maven

    @Override
    protected void tearDown(TestInfo testInfo) throws Exception {
        super.tearDown(testInfo);
    }

    @Test
    public void test_constructor() {
        // Test that constructor creates instance without error
        PurgeDocJob job = new PurgeDocJob();
        assertNotNull(job);
    }

    @Test
    public void test_execute_success() {
        // Execute the job