private enum Direction {
    UP,
    DOWN
  }

  public interface SomeInterface {}

  public abstract static class SomeAbstractClass {
    public static final SomeAbstractClass INSTANCE = new SomeAbstractClass() {};

    public SomeAbstractClass() {}
  }

  static class NonPublicClass {
    public NonPublicClass() {}
  }

  private static class WithPrivateConstructor {