* @return the element type of the collection
     */
    public static Class<?> getElementTypeOfCollection(final Field field) {
        assertArgumentNotNull("field", field);

        final Type type = field.getGenericType();
        return GenericsUtil.getRawClass(GenericsUtil.getElementTypeOfCollection(type));
    }

    /**
     * Returns the key type of a parameterized map field.
     *

    }

    Field delegateField = SubBar.class.getDeclaredField("delegate");
    // barType is Bar<T>, a ParameterizedType with no generic arguments specified
    TypeToken<?> barType = TypeToken.of(delegateField.getGenericType());
    assertThat(barType.getSubtype(SubBar.class)).isEqualTo(new SubBar<Void>().fieldTypeAsSubBar());
  }

  @SuppressWarnings("unchecked") // To construct TypeToken<T> with TypeToken.of()

    }

    Field delegateField = SubBar.class.getDeclaredField("delegate");
    // barType is Bar<T>, a ParameterizedType with no generic arguments specified
    TypeToken<?> barType = TypeToken.of(delegateField.getGenericType());
    assertThat(barType.getSubtype(SubBar.class)).isEqualTo(new SubBar<Void>().fieldTypeAsSubBar());
  }

  @SuppressWarnings("unchecked") // To construct TypeToken<T> with TypeToken.of()

     * @return the generic type class, or null if not found
     */
    public static Type getGenericParameter(final java.lang.reflect.Field field, final int index) {
        return getGenericParameter(field.getGenericType(), index);
    }

    /**
     * Returns the generic type of the specified field for the given index, or the default class if not found.
     *
     * @param field the field to analyze

    for (Field field : fields) {
      if (Modifier.isPublic(field.getModifiers())
          && Modifier.isStatic(field.getModifiers())
          && Modifier.isFinal(field.getModifiers())) {
        if (field.getGenericType() == field.getType() && type.isAssignableFrom(field.getType())) {
          field.setAccessible(true);
          try {
            T constant = type.cast(field.get(null));
            if (constant != null) {

    for (Field field : fields) {
      if (Modifier.isPublic(field.getModifiers())
          && Modifier.isStatic(field.getModifiers())
          && Modifier.isFinal(field.getModifiers())) {
        if (field.getGenericType() == field.getType() && type.isAssignableFrom(field.getType())) {
          field.setAccessible(true);
          try {
            T constant = type.cast(field.get(null));
            if (constant != null) {