### Create an `Enum` class { #create-an-enum-class }

Import `Enum` and create a sub-class that inherits from `str` and from `Enum`.

By inheriting from `str` the API docs will be able to know that the values must be of type `string` and will be able to render correctly.

Then create class attributes with fixed values, which will be the available valid values:

:baseDirNotFound
if "_%EXEC_DIR:~-1%"=="_\" set "EXEC_DIR=%EXEC_DIR:~0,-1%"
set "MAVEN_PROJECTBASEDIR=%EXEC_DIR%"
cd /d "%EXEC_DIR%"

:endDetectBaseDir

rem Initialize JVM_CONFIG_MAVEN_OPTS to empty to avoid inheriting from environment
set JVM_CONFIG_MAVEN_OPTS=

if not exist "%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config" goto endReadJvmConfig

rem Use Java source-launch mode (JDK 11+) to parse jvm.config

In this case, you can return the file path directly from your *path operation* function.

## Custom response class { #custom-response-class }

You can create your own custom response class, inheriting from `Response` and using it.

    // It would be nice to be able to return a real concurrent
    // collection like ConcurrentLinkedQueue, so that e.g. concurrent
    // iteration would work, but that would not be GWT-compatible.
    // We are not "just" inheriting from ArrayList here as this doesn't work for J2kt.
    return new AbstractList<T>() {
      final ArrayList<T> data = new ArrayList<>();

      @Override
      public int size() {

    as a dependency. All other OAuth2 classes inherit from it and customize it for
    each OAuth2 flow.

    You normally would not create a new class inheriting from it but use one of the
    existing subclasses, and maybe compose them if you want to support multiple flows.

    Read more about it in the

We don't really need to inherit from `HeroBase` because we are re-declaring all the fields. I'll leave it inheriting just for consistency, but this is not necessary. It's more a matter of personal taste. 🤷

The fields of `HeroUpdate` are:

* `name`
* `age`
* `secret_name`

    // It would be nice to be able to return a real concurrent
    // collection like ConcurrentLinkedQueue, so that e.g. concurrent
    // iteration would work, but that would not be GWT-compatible.
    // We are not "just" inheriting from ArrayList here as this doesn't work for J2kt.
    return new AbstractList<T>() {
      final ArrayList<T> data = new ArrayList<>();

      @Override
      public int size() {

        String result = StringUtil.join(" - ", "apple", "banana", "cherry");
        assertEquals("apple - banana - cherry", result);
    }

    @Test
    @DisplayName("Should handle null delimiter by inserting 'null' string")
    void testJoinWithNullDelimiter() {
        String result = StringUtil.join(null, "first", "second", "third");
        assertEquals("firstnullsecondnullthird", result);
    }

    @Test

                        entry.map.put(domain, new HashMap<>());
                        if (log.isTraceEnabled()) {
                            log.trace("Inserting cache entry for domain " + domain + ": " + dr);
                        }
                        dr = dr.next();
                    } while (dr != start);
                    this._domains = entry;

 * together. Any creation method that would customarily respect insertion order (such as {@link
 * #copyOf(Multimap)}) instead preserves key-grouped order by inserting entries for an existing key
 * immediately after the last entry having that key.
 *
 * <p>See the Guava User Guide article on <a href=