*       CheckedRunnable} and {@link CheckedCallable}).
 *   <li>If you override {@link #tearDown}, make sure to invoke {@code super.tearDown} within it.
 *       This method is used to clear and check for thread assertion failures.
 *   <li>All threads generated must be joined inside each test case method (or {@code fail} to do
 *       so) before returning from the method. The {@code joinPool} method can be used to do this

    }

    @Override
    public void close() {
        if (closed) {
            return;
        }

        try {
            secureWipePassword();

            // Clear other sensitive data
            domain = null;
            username = null;
            sessionId = null;

   *
   * <p>This method is not atomic: the map may not be empty after returning if there were concurrent
   * writes.
   */
  public void clear() {
    map.clear();
  }

  @Override
  public String toString() {
    return map.toString();
  }

  /*
   * ConcurrentMap operations which we may eventually add.
   *

        }
      };
    }

    @Override
    public Iterator<E> iterator() {
      return Multisets.iteratorImpl(this);
    }

    @Override
    public void clear() {
      countMap.clear();
    }

    private class EntrySet extends AbstractMultiset<E>.EntrySet {
      @Override
      Multiset<E> multiset() {
        return OldConcurrentHashMultiset.this;
      }

internal fun FileSystem.deleteIfExists(path: Path) {
  try {
    delete(path)
  } catch (fnfe: FileNotFoundException) {
    return
  }
}

/** Tolerant delete, try to clear as many files as possible even after a failure. */
internal fun FileSystem.deleteContents(directory: Path) {
  var exception: IOException? = null
  val files =
    try {
      list(directory)

  public void testSkip_structurallyModifiedSkipSomeList() throws Exception {
    List<String> list = Lists.newArrayList("a", "b", "c");
    FluentIterable<String> tail = FluentIterable.from(list).skip(1);
    list.subList(1, 3).clear();
    list.addAll(0, Lists.newArrayList("X", "Y", "Z"));
    assertThat(tail).containsExactly("Y", "Z", "a").inOrder();
  }

  public void testSkip_structurallyModifiedSkipAll() throws Exception {

          // Keep looping till we find a non-duplicate value.
          if (!duplicate) {
            lastValue = next;
            return lastValue;
          }
        }

        lastValue = null; // clear reference to unused data
        return endOfData();
      }
    };
  }

  @GwtIncompatible @J2ktIncompatible private static final long serialVersionUID = 0;

pkg slices, func Sorted[$0 cmp.Ordered](iter.Seq[$0]) []$0 #61899
pkg slices, func Values[$0 interface{ ~[]$1 }, $1 interface{}]($0) iter.Seq[$1] #61899
pkg structs, type HostLayout struct #66408
pkg sync, method (*Map) Clear() #61696
pkg sync/atomic, func AndInt32(*int32, int32) int32 #61395
pkg sync/atomic, func AndInt64(*int64, int64) int64 #61395
pkg sync/atomic, func AndUint32(*uint32, uint32) uint32 #61395

  // TODO(tfrt-devs): Figure out a way to deprecate following features after
  // migrated to TFRT.
  //===--------------------------------------------------------------------===//
  // Clear pending nodes in thread executors and kernel caches.
  virtual void ClearCachesAndThreadExecutors() = 0;

  // Initialize the step resource container for a training step. This is used

{* ../../docs_src/dependencies/tutorial011_an_py310.py hl[22] *}

/// tip

All this might seem contrived. And it might not be very clear how is it useful yet.

These examples are intentionally simple, but show how it all works.

In the chapters about security, there are utility functions that are implemented in this same way.