* behavior of {@link #offer} which can lead to unexpected behavior. In this case, you should
 * override {@code offer} as well.
 *
 * <p><b>{@code default} method warning:</b> This class does <i>not</i> forward calls to {@code
 * default} methods. Instead, it inherits their default implementations. When those implementations
 * invoke methods, they invoke methods on the {@code ForwardingDeque}.
 *
 * @author Kurt Alfred Kluever
 * @since 12.0

        return System.getProperty(key);
    }

    /**
     * Returns the system property value for the specified key, or the default value if not found.
     *
     * @param key the property key
     * @param defaultValue the default value
     * @return the property value, or the default value if not found
     */
    public static String getProperty(String key, String defaultValue) {

        TestLocking t = new TestLocking();

        // Check default field values
        assertEquals(1, t.numThreads, "Default numThreads should be 1");
        assertEquals(1, t.numIter, "Default numIter should be 1");
        assertEquals(100L, t.delay, "Default delay should be 100");
        assertNull(t.url, "URL should be null by default");
        assertEquals(0, t.numComplete, "numComplete should start at 0");

sftp>
```

## Advanced options

### Change default FTP port

Default port '8021' can be changed via

```
--ftp="address=:3021"
```

### Change FTP passive port range

By default FTP requests OS to give a free port automatically, however you may want to restrict
this to specific ports in certain restricted environments via

/**
 * A builder for constructing instances of {@link MutableValueGraph} or {@link ImmutableValueGraph}
 * with user-defined properties.
 *
 * <p>A {@code ValueGraph} built by this class has the following default properties:
 *
 * <ul>
 *   <li>does not allow self-loops
 *   <li>orders {@link ValueGraph#nodes()} in the order in which the elements were added (insertion
 *       order)
 * </ul>
 *

     */
    @Nonnull
    default String prompt(@Nullable String message) throws PrompterException {
        return prompt(message, null, null);
    }

    /**
     * Prompts the user for a string using a default value.
     *
     * @param message the message to display
     * @param defaultReply the default reply value
     * @return the string entered by the user

...then because `description` has a default value, if you **don't return anything** for that field, it will still have that **default value**.

### Model for Output Response Data { #model-for-output-response-data }

If you interact with the docs and check the response, even though the code didn't add anything in one of the `description` fields, the JSON response contains the default value (`null`):

<div class="screenshot">

     */
    protected int getDefaultPageSize() {
        return ComponentUtil.getFessConfig().getPagingPageSizeAsInteger();
    }

    /**
     * Gets the default current page number, which is 1.
     *
     * @return The default current page number.
     */
    protected int getDefaultCurrentPageNumber() {
        return 1;
    }

    /**
     * Gets the total number of records.
     *

    }

    /**
     * Returns the MIME type for the given file extension with a custom default.
     *
     * @param extension the file extension to look up (without the dot)
     * @param def the default MIME type to return if no mapping is found
     * @return the MIME type for the extension, or the specified default if not found
     * @throws IOException if there is an error processing the MIME mappings
     */

     *
     * @return the result of the settings building, never {@code null}
     * @throws SettingsBuilderException if the effective settings could not be built
     */
    @Nonnull
    default SettingsBuilderResult build(
            @Nonnull Session session, @Nonnull Source installationSettingsSource, @Nonnull Source userSettingsSource) {
        return build(session, installationSettingsSource, null, userSettingsSource);