### Question:
Primitives { public static boolean isPrimitive(Field field) { return isPrimitive(field.getType()); } private  Primitives(); static void registerPrimitiveClass(Class primitiveClass); @SneakyThrows static void registerPrimitiveClass(Class primitiveClass, Object primitiveDefault); @SuppressWarnings("unchecked") static void registerStringConverters(Class<P> primitiveClass,
      Function<String, P> stringConverter); @SuppressWarnings("unchecked") static void registerTimeConverters(Class sourceTimeClass, Class targetTimeClass,
      Function<Object, Object> timeConverter); static boolean isPrimitive(Field field); static boolean isPrimitive(Class clazz); static boolean isPrimitiveDefault(Field field, Object value); static Object asPrimitiveType(Field field, String defaultValue); static boolean isMissing(Object object); static boolean isTimeType(Class clazz); static Date toDate(long epoch); static Date toDate(long epoch, TimeUnit timeUnit); static long toEpoch(Date date); static Instant toInstant(long epoch); static long toEpoch(Instant instant); static Instant toInstant(Date date); static Date toDate(Instant instant); @SuppressWarnings("unchecked") static T toTimeType(Object timeValue, Class<T> targetTimeType); static boolean allowDefaultKeys; }### Answer:
@Test public void testIsPrimitiveType() { assertTrue(isPrimitive(String.class)); assertTrue(isPrimitive(Graph.Should.class)); assertFalse(isPrimitive(Set.class)); }