*       threads, RPC network threads, or other latency-sensitive threads. In those cases, slow
   *       listeners can harm responsiveness, slow the system as a whole, or worse. (See also the
   *       note about locking below.)
   *   <li>If many tasks will be triggered by the same event, one heavyweight task may delay other

</pre>

<p>
As before, there is no guarantee that, in <code>main</code>,
observing the write to <code>done</code>
implies observing the write to <code>a</code>, so this program could
print an empty string too.
Worse, there is no guarantee that the write to <code>done</code> will ever
be observed by <code>main</code>, since there are no synchronization
events between the two threads.  The loop in <code>main</code> is not
guaranteed to finish.

existence; `and now for the garden!' and she ran with all speed
back to the little door:  but, alas! the little door was shut
again, and the little golden key was lying on the glass table as
before, `and things are worse than ever,' thought the poor child,
`for I never was so small as this before, never!  And I declare
it's too bad, that it is!'

  As she said these words her foot slipped, and in another

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    unfiltered.put("cat", 3);
    unfiltered.put("dog", 2);
    unfiltered.put("horse", 5);
    Map<String, Integer> filtered = Maps.filterEntries(unfiltered, CORRECT_LENGTH);
    assertEquals(ImmutableMap.of("cat", 3, "horse", 5), filtered);

    filtered.put("chicken", 7);
    assertEquals(ImmutableMap.of("cat", 3, "horse", 5, "chicken", 7), filtered);

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   *     .collect(least(2, comparingInt(String::length)))
   * // returns {"foo", "quux"}
   * }
   *
   * <p>This {@code Collector} uses O(k) memory and takes expected time O(n) (worst-case O(n log
   * k)), as opposed to e.g. {@code Stream.sorted(comparator).limit(k)}, which currently takes O(n
   * log n) time and O(n) space.
   *
   * @throws IllegalArgumentException if {@code k < 0}
   * @since 22.0

  protected class StandardKeySet extends Maps.SortedKeySet<K, V> {
    /** Constructor for use by subclasses. */
    public StandardKeySet() {
      super(ForwardingSortedMap.this);
    }
  }

  // unsafe, but worst case is a CCE or NPE is thrown, which callers will be expecting
  @SuppressWarnings({"unchecked", "nullness"})
  static int unsafeCompare(
      @Nullable Comparator<?> comparator, @Nullable Object o1, @Nullable Object o2) {

Ich denke, `Union[SomeType, None]` ist expliziter bezüglich seiner Bedeutung.

Es geht nur um Worte und Namen. Aber diese Worte können beeinflussen, wie Sie und Ihre Teamkollegen über den Code denken.

Nehmen wir zum Beispiel diese Funktion:

{* ../../docs_src/python_types/tutorial009c_py39.py hl[1,4] *}

  }

  @Override
  public boolean contains(@Nullable Object object) {
    if (object == null) {
      return false;
    }
    try {
      @SuppressWarnings("unchecked") // The worst case is usually CCE, which we catch.
      C c = (C) object;
      return range.contains(c);
    } catch (ClassCastException e) {
      return false;
    }
  }

  @Override