Er zijn enkele datastructuren die andere waarden kunnen bevatten, zoals `dict`, `list`, `set` en `tuple` en waar ook de interne waarden hun eigen type kunnen hebben.

Deze types die interne types hebben worden “**generieke**” types genoemd. Het is mogelijk om ze te declareren, zelfs met hun interne types.

package com.google.common.collect.testing;

import static com.google.common.collect.testing.Helpers.castOrCopyToList;
import static com.google.common.collect.testing.Helpers.copyToList;
import static java.util.Collections.reverse;

import com.google.common.annotations.GwtIncompatible;
import com.google.common.collect.testing.DerivedCollectionGenerators.Bound;
import com.google.common.collect.testing.DerivedCollectionGenerators.ForwardingTestMapGenerator;

    assertThat(Floats.stringConverter().reverse().convert(null)).isNull();
  }

  @J2ktIncompatible
  @GwtIncompatible // Float.toString returns different value in GWT.
  public void testStringConverter_reverse() {
    Converter<String, Float> converter = Floats.stringConverter();
    assertThat(converter.reverse().convert(1.0f)).isEqualTo("1.0");
    assertThat(converter.reverse().convert(0.0f)).isEqualTo("0.0");

    assertThat(Doubles.stringConverter().reverse().convert(null)).isNull();
  }

  @GwtIncompatible // Double.toString returns different value in GWT.
  public void testStringConverter_reverse() {
    Converter<String, Double> converter = Doubles.stringConverter();
    assertThat(converter.reverse().convert(1.0)).isEqualTo("1.0");
    assertThat(converter.reverse().convert(0.0)).isEqualTo("0.0");

    assertThat(Floats.stringConverter().reverse().convert(null)).isNull();
  }

  @J2ktIncompatible
  @GwtIncompatible // Float.toString returns different value in GWT.
  public void testStringConverter_reverse() {
    Converter<String, Float> converter = Floats.stringConverter();
    assertThat(converter.reverse().convert(1.0f)).isEqualTo("1.0");
    assertThat(converter.reverse().convert(0.0f)).isEqualTo("0.0");

    Arrays.sort(array, fromIndex, toIndex);
    reverse(array, fromIndex, toIndex);
  }

  /**
   * Reverses the elements of {@code array}. This is equivalent to {@code
   * Collections.reverse(Longs.asList(array))}, but is likely to be more efficient.
   *
   * @since 23.1
   */
  public static void reverse(long[] array) {
    checkNotNull(array);
    reverse(array, 0, array.length);
  }

  /**

    Arrays.sort(array, fromIndex, toIndex);
    reverse(array, fromIndex, toIndex);
  }

  /**
   * Reverses the elements of {@code array}. This is equivalent to {@code
   * Collections.reverse(Longs.asList(array))}, but is likely to be more efficient.
   *
   * @since 23.1
   */
  public static void reverse(long[] array) {
    checkNotNull(array);
    reverse(array, 0, array.length);
  }

  /**

    return offset + size;
  }

  /**
   * Returns a view of this immutable list in reverse order. For example, {@code ImmutableList.of(1,
   * 2, 3).reverse()} is equivalent to {@code ImmutableList.of(3, 2, 1)}.
   *
   * @return a view of this immutable list in reverse order
   * @since 7.0
   */
  public ImmutableList<E> reverse() {
    return (size() <= 1) ? this : new ReverseImmutableList<E>(this);
  }

    Arrays.sort(array, fromIndex, toIndex);
    reverse(array, fromIndex, toIndex);
  }

  /**
   * Reverses the elements of {@code array}. This is equivalent to {@code
   * Collections.reverse(Chars.asList(array))}, but is likely to be more efficient.
   *
   * @since 23.1
   */
  public static void reverse(char[] array) {
    checkNotNull(array);
    reverse(array, 0, array.length);
  }

  /**

    /* UnsupportedOperationException on indirect modifications. */
    NavigableSet<Integer> reverse = unmod.descendingSet();
    assertThrows(UnsupportedOperationException.class, () -> reverse.add(4));
    assertThrows(UnsupportedOperationException.class, () -> reverse.addAll(singleton(4)));
    assertThrows(UnsupportedOperationException.class, () -> reverse.remove(4));
  }

  void ensureNotDirectlyModifiable(SortedSet<Integer> unmod) {