* </ul>
 *
 * <p>If no backing thread factory is provided, a default backing thread factory is used as if by
 * calling {@code setThreadFactory(}{@link Executors#defaultThreadFactory()}{@code )}.
 *
 * <p><b>Java 21+ users:</b> consider using the {@code Thread.Builder} interface instead. E.g.,
 * instead of {@code new ThreadFactoryBuilder().setPriority(priority).setDaemon(false).build()}, use

    ThreadFactory threadFactory = builder.build();
    Thread thread = threadFactory.newThread(monitoredRunnable);
    checkThreadPoolName(thread, 1);

    Thread defaultThread = Executors.defaultThreadFactory().newThread(monitoredRunnable);
    assertEquals(defaultThread.isDaemon(), thread.isDaemon());
    assertEquals(defaultThread.getPriority(), thread.getPriority());

    ThreadFactory threadFactory = builder.build();
    Thread thread = threadFactory.newThread(monitoredRunnable);
    checkThreadPoolName(thread, 1);

    Thread defaultThread = Executors.defaultThreadFactory().newThread(monitoredRunnable);
    assertEquals(defaultThread.isDaemon(), thread.isDaemon());
    assertEquals(defaultThread.getPriority(), thread.getPriority());

  public void testPlatformThreadFactory_default() {
    ThreadFactory factory = MoreExecutors.platformThreadFactory();
    assertNotNull(factory);
    // Executors#defaultThreadFactory() may return a new instance each time.
    assertEquals(factory.getClass(), Executors.defaultThreadFactory().getClass());
  }

  public void testThreadRenaming() {
    Executor renamingExecutor =

  public void testPlatformThreadFactory_default() {
    ThreadFactory factory = MoreExecutors.platformThreadFactory();
    assertNotNull(factory);
    // Executors#defaultThreadFactory() may return a new instance each time.
    assertEquals(factory.getClass(), Executors.defaultThreadFactory().getClass());
  }

  public void testThreadRenaming() {
    Executor renamingExecutor =

   * it returns {@link Executors#defaultThreadFactory()}.
   *
   * @since 14.0
   */
  @J2ktIncompatible
  @GwtIncompatible // concurrency
  public static ThreadFactory platformThreadFactory() {
    if (!isAppEngineWithApiClasses()) {
      return Executors.defaultThreadFactory();
    }
    try {
      return (ThreadFactory)