assertTrue("addAll(containsNull) should return true", collection.addAll(containsNull));
    /*
     * We need (E) to force interpretation of null as the single element of a
     * varargs array, not the array itself
     */
    expectAdded((E) null);
  }

  @CollectionFeature.Require(value = SUPPORTS_ADD, absent = ALLOWS_NULL_VALUES)
  public void testAddAll_nullUnsupported() {

  // See CompactHashMap for a detailed description of how the following fields work. That
  // description talks about `keys`, `values`, and `entries`; here the `keys` and `values` arrays
  // are replaced by a single `elements` array but everything else works similarly.

  /**
   * The hashtable object. This can be either:
   *
   * <ul>
   *   <li>a byte[], short[], or int[], with size a power of two, created by

      fail("no exception thrown");
    } catch (IllegalArgumentException e) {
      assertThat(e).hasMessageThat().isEqualTo("A null C");
    }
  }

  @J2ktIncompatible // TODO(b/319404022): Allow passing null array as varargs
  public void testCheckArgument_singleNullArray_failure() {
    try {
      Preconditions.checkArgument(false, "A %s C", (Object[]) null);
      fail("no exception thrown");

  }

  /**
   * Each instance of MinMaxPriorityQueue encapsulates two instances of Heap: a min-heap and a
   * max-heap. Conceptually, these might each have their own array for storage, but for efficiency's
   * sake they are stored interleaved on alternate heap levels in the same array (MMPQ.queue).
   */
  @WeakOuter
  class Heap {
    final Ordering<E> ordering;

    @SuppressWarnings("nullness:initialization.field.uninitialized")

 * @see ClassTraversalUtil
 * @see ResourceTraversalUtil
 */
public abstract class TraversalUtil {

    /** 空の{@link Traverser}の配列です。 */
    protected static final Traverser[] EMPTY_ARRAY = new Traverser[0];

    private static final Logger logger = Logger.getLogger(TraversalUtil.class);

    /** URLのプロトコルをキー、{@link TraverserFactory}を値とするマッピングです。 */

      if (!original.isPartialView()) {
        return original;
      }
    }
    @SuppressWarnings("unchecked") // elements only contains E's; it's safe.
    E[] array = (E[]) Iterables.toArray(elements);
    return construct(comparator, array.length, array);
  }

  /**
   * Returns an immutable sorted set containing the given elements sorted by the given {@code

  public void testCombinationsExhaustively_startingFromArbitrary() {
    Ordering<Object> arbitrary = Ordering.arbitrary();
    Object[] array = {1, "foo", new Object()};

    // There's no way to tell what the order should be except empirically
    Arrays.sort(array, arbitrary);
    testExhaustively(arbitrary, array);
  }

  /**
   * Requires at least 3 elements in {@code strictlyOrderedElements} in order to test the varargs

  public void testCombinationsExhaustively_startingFromArbitrary() {
    Ordering<Object> arbitrary = Ordering.arbitrary();
    Object[] array = {1, "foo", new Object()};

    // There's no way to tell what the order should be except empirically
    Arrays.sort(array, arbitrary);
    testExhaustively(arbitrary, array);
  }

  /**
   * Requires at least 3 elements in {@code strictlyOrderedElements} in order to test the varargs

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import javax.annotation.CheckForNull;

/**
 * An {@link OutputStream} that starts buffering to a byte array, but switches to file buffering
 * once the data reaches a configurable size.
 *
 * <p>When this stream creates a temporary file, it restricts the file's permissions to the current

    Iterable<String> iterable = Collections.emptyList();
    String[] array = Iterables.toArray(iterable, String.class);
    assertTrue(Arrays.equals(new String[0], array));
  }

  @GwtIncompatible // Iterables.toArray(Iterable, Class)
  public void testToArraySingleton() {
    Iterable<String> iterable = Collections.singletonList("a");
    String[] array = Iterables.toArray(iterable, String.class);