createDirs("a", "b")
        settingsFile << "include 'a', 'b'"
        buildFile << """
            project(':a') {
                task classes {
                    ext.outputDir = objects.directoryProperty()
                    outputs.dir(outputDir)
                    outputDir.set(layout.buildDirectory.dir("classes"))
                }
                artifacts {
                    compile classes.outputDir

        buildFile """
            abstract class Generate extends DefaultTask {
                @OutputDirectory
                abstract DirectoryProperty getOutputDirectory()

                @TaskAction
                void generate() {
                    def outputFile = outputDirectory.get().file("generated.txt").asFile

        buildFile << """
            abstract class CustomTask extends DefaultTask {
                @OutputDirectory
                abstract DirectoryProperty getOutputDirectory()

                @TaskAction
                void doAction() {
                    getOutputDirectory().file("output.txt").get().asFile.text = "output"
                }
            }

            abstract class TaskWithInputs extends DefaultTask {
                ${ api == Api.ANNOTATION_API ? "@InputDirectory @PathSensitive(PathSensitivity.RELATIVE)" : "@Internal" }
                abstract DirectoryProperty getSources()

                @OutputFile
                abstract RegularFileProperty getOutputFile()

                @TaskAction
                void doSomething() {

|Property Type |Note

|`Property<T>`
|Where `T` is typically `Double`, `Integer`, `Long`, `String`, or `Bool`

|`RegularFileProperty`
|Configurable regular file location, whose value is mutable

|`DirectoryProperty`
|Configurable directory location, whose value is mutable

|`ListProperty<T>`
|List of elements of type `T`

|`SetProperty<T>`
|Set of elements of type `T`

|`MapProperty<K, V>`

    @Internal
    final ConfigurableFileCollection gradleHomeDir

    @PathSensitive(PathSensitivity.RELATIVE)
    @InputDirectory
    final DirectoryProperty samplesdir

    @Nested
    final GradleDistribution gradleDistribution

    private final FileCollection testTaskClasspath
    private final Directory repoRoot

    @Inject

 *     <li>Using the methods on {@link org.gradle.api.file.Directory} and {@link org.gradle.api.file.DirectoryProperty} to produce file providers.</li>
 *     <li>By calling {@link ProviderFactory#provider(Callable)} or {@link org.gradle.api.Project#provider(Callable)} to create a new provider from a {@link Callable}.</li>
 * </ul>
 *
 * <p>

        buildFile """
            import static org.gradle.util.internal.TextUtil.normaliseFileSeparators

            abstract class Producer extends DefaultTask {
                @OutputDirectory abstract DirectoryProperty getOutputClasses()

                Producer() { outputs.upToDateWhen { false } } // TODO doesn't matter, remove this

                @TaskAction void doStuff() {

            }

            abstract class MakeGreen implements TransformAction<Parameters> {
                interface Parameters extends TransformParameters {
                    @InputDirectory
                    DirectoryProperty getSomeDir()
                }

                @InputArtifact
                abstract Provider<FileSystemLocation> getInputArtifact()

                void transform(TransformOutputs outputs) {

It provides methods for creating instances of different types, such as properties (`Property<T>`), collections (`ListProperty<T>`, `SetProperty<T>`, `MapProperty<K, V>`), file-related objects (`RegularFileProperty`, `DirectoryProperty`, `ConfigurableFileCollection`, `ConfigurableFileTree`), and more.

You can obtain an instance of `ObjectFactory` using the `project.objects` property.