* which are awaiting cleanup.
     */
    volatile int count;

    /**
     * Number of updates that alter the size of the table. This is used during bulk-read methods to
     * make sure they see a consistent snapshot: If modCounts change during a traversal of segments
     * computing size or checking containsValue, then we might have an inconsistent view of state so
     * (usually) must retry.
     */
    int modCount;

    } else if (size < 0) {
      throw new IllegalArgumentException("negative size: " + size);
    } else { // index >= size
      return lenientFormat("%s (%s) must be less than size (%s)", desc, index, size);
    }
  }

  /**
   * Ensures that {@code index} specifies a valid <i>position</i> in an array, list or string of

    }

    @CanIgnoreReturnValue
    Builder<K, V> combine(ImmutableSortedMap.Builder<K, V> other) {
      ensureCapacity(size + other.size);
      System.arraycopy(other.keys, 0, this.keys, this.size, other.size);
      System.arraycopy(other.values, 0, this.values, this.size, other.size);
      size += other.size;
      return this;
    }

    /**
     * Returns a newly-created immutable sorted map.
     *

                    int size = elements.length;
                    // Remove last element, if size > 1
                    Set<String> set1 =
                        (size > 1)
                            ? Sets.newHashSet(Arrays.asList(elements).subList(0, size - 1))
                            : Sets.newHashSet(elements);
                    // Remove first element, if size > 0
                    Set<String> set2 =

    }

    default void setLtrWindowSize(final int value) {
        setSystemPropertyAsInt(Constants.LTR_WINDOW_SIZE_PROPERTY, value);
    }

    default int getLtrWindowSize() {
        return getSystemPropertyAsInt(Constants.LTR_WINDOW_SIZE_PROPERTY, 100);
    }

    default String[] getAzureAdPermissionFields() {
        return split(getSystemProperty("aad.permission.fields", "mail"), ",")

    assertNotNull(cache.getUnchecked(key));
    assertEquals(1, cache.size());
    assertEquals(2, countingLoader.getCount());

    CacheTesting.simulateValueReclamation(cache, key);
    cache.refresh(key);
    checkNothingLogged();
    assertEquals(1, cache.size());
    assertEquals(3, countingLoader.getCount());
  }

 * </p>
 *
 * @author koichik
 */
public abstract class CopyUtil {

    /** コピーで使用するバッファサイズ */
    protected static final int DEFAULT_BUF_SIZE = 4096;

    // ////////////////////////////////////////////////////////////////
    // from InputStream to OutputStream
    //
    /**
     * 入力ストリームから出力ストリームへコピーします。
     * <p>

    }
  }

  public void testSize0() {
    Iterator<String> iterator = Iterators.emptyIterator();
    assertEquals(0, Iterators.size(iterator));
  }

  public void testSize1() {
    Iterator<Integer> iterator = Collections.singleton(0).iterator();
    assertEquals(1, Iterators.size(iterator));
  }

  public void testSize_partiallyConsumed() {
    Iterator<Integer> iterator = asList(1, 2, 3, 4, 5).iterator();

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   *     partitions
   * @throws IllegalArgumentException if {@code size} is nonpositive
   */
  public static <T extends @Nullable Object> UnmodifiableIterator<List<T>> partition(
      Iterator<T> iterator, int size) {
    return partitionImpl(iterator, size, false);
  }

  /**
   * Divides an iterator into unmodifiable sublists of the given size, padding the final iterator