public String designFileName;

    /**
     * Default constructor for UploadForm.
     * Creates a new instance with default values.
     */
    public UploadForm() {
        // Default constructor
    }

     */
    @Required
    public MultipartFormFile protwordsFile;

    /**
     * Default constructor for UploadForm.
     * Creates a new instance with default values.
     */
    public UploadForm() {
        // Default constructor
    }

    URLStreamHandler getUrlHandler();

    /**
     * Check if default credentials are configured
     *
     * @return whether default credentials are available
     */
    boolean hasDefaultCredentials();

    /**
     * Create a child context with default credentials
     *
     * @return a child context using the configured default credentials
     */
    CIFSContext withDefaultCredentials();

    /**
     * Dictionary ID for identifying the stemmer override dictionary to download.
     */
    @Required
    public String dictId;

    /**
     * Default constructor.
     */
    public DownloadForm() {
        // Use of default constructor
    }

    /**
     * Dictionary ID for identifying the stop words dictionary to download.
     */
    @Required
    public String dictId;

    /**
     * Default constructor.
     */
    public DownloadForm() {
        // Use of default constructor
    }

package org.codelibs.fess.util;

import org.dbflute.optional.OptionalEntity;

/**
 * Utility class for Optional operations.
 */
public class OptionalUtil {

    /**
     * Default constructor.
     */
    private OptionalUtil() {
        // Default constructor
    }

    /**
     * Creates an OptionalEntity from a nullable entity.
     *
     * @param <T> the type of the entity

    @BeforeAll
    static void setUpClass() {
        // Save original property
        originalLmCompatibility = System.getProperty("jcifs.smb1.smb.lmCompatibility");
        // Set default for tests
        jcifs.smb1.Config.setProperty("jcifs.smb1.smb.lmCompatibility", "3");
    }

    @AfterAll
    static void tearDownClass() {
        // Restore original property

{* ../../docs_src/query_params_str_validations/tutorial002.py hl[9] *}

Note que substituímos o valor padrão de `None` para `Query(default=None)`, o primeiro parâmetro de `Query` serve para o mesmo propósito: definir o valor padrão do parâmetro.

Então:

```Python
q: Union[str, None] = Query(default=None)
```

...Torna o parâmetro opcional, da mesma maneira que:

```Python
q: Union[str, None] = None
```

        assertEquals("present", presentOptional.orElse("default"));

        // Test with null value
        String nullValue = null;
        OptionalEntity<String> emptyOptional = OptionalUtil.ofNullable(nullValue);

        assertFalse(emptyOptional.isPresent());
        assertEquals("default", emptyOptional.orElse("default"));

        // Test that empty optional returns null instead of throwing

/**
 * A builder for constructing instances of {@link MutableNetwork} or {@link ImmutableNetwork} with
 * user-defined properties.
 *
 * <p>A {@code Network} built by this class has the following default properties:
 *
 * <ul>
 *   <li>does not allow parallel edges
 *   <li>does not allow self-loops
 *   <li>orders {@link Network#nodes()} and {@link Network#edges()} in the order in which the