### Question:
Algorithm { static <T> Function<T, T> identity() { return new Function<T, T>() { @Override public T execute(T value) { return value; } }; }  static ArrayList<E> findAll(Ite input, Predicate<E> predicate);  }### Answer:
@Test public void testIdentity() { Function<Boolean, Boolean> idBoolean = identity(); try { assertThat(idBoolean.execute(true), is(true)); assertThat(idBoolean.execute(false), is(false)); } catch (Throwable throwable) { fail("The function should not throw any exception"); } }