java.util.Collection.size()方法的使用及代码示例

x33g5p2x  于2022-01-16 转载在 其他  
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本文整理了Java中java.util.Collection.size()方法的一些代码示例，展示了Collection.size()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Collection.size()方法的具体详情如下：
包路径：java.util.Collection
类名称：Collection
方法名：size

Collection.size介绍

[英]Returns a count of how many objects this Collection contains.
[中]返回此集合包含多少对象的计数。

代码示例

代码示例来源：origin: google/guava

  1. private ClusterException(Collection<? extends Throwable> exceptions) {
  2.  super(
  3.    exceptions.size() + " exceptions were thrown. The first exception is listed as a cause.",
  4.    exceptions.iterator().next());
  5.  ArrayList<Throwable> temp = new ArrayList<>();
  6.  temp.addAll(exceptions);
  7.  this.exceptions = Collections.unmodifiableCollection(temp);
  8. }

代码示例来源：origin: google/guava

  1. private static <E> ArrayList<E> toArrayList(Collection<E> c) {
  2.  // Avoid calling ArrayList(Collection), which may call back into toArray.
  3.  ArrayList<E> result = new ArrayList<>(c.size());
  4.  Iterators.addAll(result, c.iterator());
  5.  return result;
  6. }

代码示例来源：origin: hibernate/hibernate-orm

  1. public static boolean[] toBooleanArray(Collection coll) {
  2.   Iterator iter = coll.iterator();
  3.   boolean[] arr = new boolean[coll.size()];
  4.   int i = 0;
  5.   while ( iter.hasNext() ) {
  6.     arr[i++] = (Boolean) iter.next();
  7.   }
  8.   return arr;
  9. }

代码示例来源：origin: spring-projects/spring-framework

  1. @Test
  2. public void httpHeaderNameCasingIsPreserved() throws Exception {
  3.   final String headerName = "Header1";
  4.   response.addHeader(headerName, "value1");
  5.   Collection<String> responseHeaders = response.getHeaderNames();
  6.   assertNotNull(responseHeaders);
  7.   assertEquals(1, responseHeaders.size());
  8.   assertEquals("HTTP header casing not being preserved", headerName, responseHeaders.iterator().next());
  9. }

代码示例来源：origin: bumptech/glide

  1. @SuppressWarnings("PMD.AvoidInstantiatingObjectsInLoops")
  2. private static List<Key> getAlternateKeys(Collection<String> alternateUrls) {
  3.  List<Key> result = new ArrayList<>(alternateUrls.size());
  4.  for (String alternate : alternateUrls) {
  5.   result.add(new GlideUrl(alternate));
  6.  }
  7.  return result;
  8. }

代码示例来源：origin: spring-projects/spring-framework

  1. @Test
  2. public void cacheAnnotationOverride() {
  3.   Collection<CacheOperation> ops = getOps(InterfaceCacheConfig.class, "interfaceCacheableOverride");
  4.   assertSame(1, ops.size());
  5.   CacheOperation cacheOperation = ops.iterator().next();
  6.   assertTrue(cacheOperation instanceof CacheableOperation);
  7. }

代码示例来源：origin: thinkaurelius/titan

  1. public static final boolean sizeLargerOrEqualThan(Iterable i, int limit) {
  2.   if (i instanceof Collection) return ((Collection)i).size()>=limit;
  3.   Iterator iter = i.iterator();
  4.   int count=0;
  5.   while (iter.hasNext()) {
  6.     iter.next();
  7.     count++;
  8.     if (count>=limit) return true;
  9.   }
  10.   return false;
  11. }

代码示例来源：origin: spring-projects/spring-framework

  1. @Test
  2. @SuppressWarnings("rawtypes")
  3. public void convertEmptyStringToCollection() {
  4.   Collection result = conversionService.convert("", Collection.class);
  5.   assertEquals(0, result.size());
  6. }

代码示例来源：origin: google/guava

  1. @CollectionFeature.Require(SUPPORTS_REMOVE)
  2. public void testClear() {
  3.  collection.clear();
  4.  assertTrue("After clear(), a collection should be empty.", collection.isEmpty());
  5.  assertEquals(0, collection.size());
  6.  assertFalse(collection.iterator().hasNext());
  7. }

代码示例来源：origin: spring-projects/spring-framework

  1. @Test
  2. public void testBuildCollectionFromMixtureOfReferencesAndValues() throws Exception {
  3.   MixedCollectionBean jumble = (MixedCollectionBean) this.beanFactory.getBean("jumble");
  4.   assertTrue("Expected 3 elements, not " + jumble.getJumble().size(),
  5.       jumble.getJumble().size() == 3);
  6.   List l = (List) jumble.getJumble();
  7.   assertTrue(l.get(0).equals("literal"));
  8.   Integer[] array1 = (Integer[]) l.get(1);
  9.   assertTrue(array1[0].equals(new Integer(2)));
  10.   assertTrue(array1[1].equals(new Integer(4)));
  11.   int[] array2 = (int[]) l.get(2);
  12.   assertTrue(array2[0] == 3);
  13.   assertTrue(array2[1] == 5);
  14. }

代码示例来源：origin: apache/kafka

  1. @SafeVarargs
  2. private static <T> void assertCollectionIs(Collection<T> collection, T... elements) {
  3.   for (T element : elements) {
  4.     assertTrue("Did not find " + element, collection.contains(element));
  5.   }
  6.   assertEquals("There are unexpected extra elements in the collection.",
  7.     elements.length, collection.size());
  8. }

代码示例来源：origin: spring-projects/spring-framework

  1. /**
  2.  * Test for {@link CustomBean} and an manually endpoint registered
  3.  * with "myCustomEndpointId". The custom endpoint does not provide
  4.  * any factory so it's registered with the default one
  5.  */
  6. public void testCustomConfiguration(ApplicationContext context) {
  7.   JmsListenerContainerTestFactory defaultFactory =
  8.       context.getBean("jmsListenerContainerFactory", JmsListenerContainerTestFactory.class);
  9.   JmsListenerContainerTestFactory customFactory =
  10.       context.getBean("customFactory", JmsListenerContainerTestFactory.class);
  11.   assertEquals(1, defaultFactory.getListenerContainers().size());
  12.   assertEquals(1, customFactory.getListenerContainers().size());
  13.   JmsListenerEndpoint endpoint = defaultFactory.getListenerContainers().get(0).getEndpoint();
  14.   assertEquals("Wrong endpoint type", SimpleJmsListenerEndpoint.class, endpoint.getClass());
  15.   assertEquals("Wrong listener set in custom endpoint", context.getBean("simpleMessageListener"),
  16.       ((SimpleJmsListenerEndpoint) endpoint).getMessageListener());
  17.   JmsListenerEndpointRegistry customRegistry =
  18.       context.getBean("customRegistry", JmsListenerEndpointRegistry.class);
  19.   assertEquals("Wrong number of containers in the registry", 2,
  20.       customRegistry.getListenerContainerIds().size());
  21.   assertEquals("Wrong number of containers in the registry", 2,
  22.       customRegistry.getListenerContainers().size());
  23.   assertNotNull("Container with custom id on the annotation should be found",
  24.       customRegistry.getListenerContainer("listenerId"));
  25.   assertNotNull("Container created with custom id should be found",
  26.       customRegistry.getListenerContainer("myCustomEndpointId"));
  27. }

代码示例来源：origin: spring-projects/spring-framework

  1. @Test
  2. public void testWhenTargetTypeIsExactlyTheCollectionInterfaceUsesFallbackCollectionType() throws Exception {
  3.   CustomCollectionEditor editor = new CustomCollectionEditor(Collection.class);
  4.   editor.setValue("0, 1, 2");
  5.   Collection<?> value = (Collection<?>) editor.getValue();
  6.   assertNotNull(value);
  7.   assertEquals("There must be 1 element in the converted collection", 1, value.size());
  8.   assertEquals("0, 1, 2", value.iterator().next());
  9. }

代码示例来源：origin: spring-projects/spring-framework

  1. private String style(Collection<?> value) {
  2.   StringBuilder result = new StringBuilder(value.size() * 8 + 16);
  3.   result.append(getCollectionTypeString(value)).append('[');
  4.   for (Iterator<?> i = value.iterator(); i.hasNext();) {
  5.     result.append(style(i.next()));
  6.     if (i.hasNext()) {
  7.       result.append(',').append(' ');
  8.     }
  9.   }
  10.   if (value.isEmpty()) {
  11.     result.append(EMPTY);
  12.   }
  13.   result.append("]");
  14.   return result.toString();
  15. }

代码示例来源：origin: jenkinsci/jenkins

  1. /**
  2.  * Removes the embedded console notes in the given log lines.
  3.  *
  4.  * @since 1.350
  5.  */
  6. public static List<String> removeNotes(Collection<String> logLines) {
  7.   List<String> r = new ArrayList<String>(logLines.size());
  8.   for (String l : logLines)
  9.     r.add(removeNotes(l));
  10.   return r;
  11. }

代码示例来源：origin: spring-projects/spring-framework

  1. @Test
  2. public void testMultipleCachingSource() {
  3.   Collection<CacheOperation> ops = getOps("multipleCaching");
  4.   assertEquals(2, ops.size());
  5.   Iterator<CacheOperation> it = ops.iterator();
  6.   CacheOperation next = it.next();
  7.   assertTrue(next instanceof CacheableOperation);
  8.   assertTrue(next.getCacheNames().contains("test"));
  9.   assertEquals("#a", next.getKey());
  10.   next = it.next();
  11.   assertTrue(next instanceof CacheableOperation);
  12.   assertTrue(next.getCacheNames().contains("test"));
  13.   assertEquals("#b", next.getKey());
  14. }

代码示例来源：origin: spring-projects/spring-framework

  1. /**
  2.  * Collect any {@link AsyncConfigurer} beans through autowiring.
  3.  */
  4. @Autowired(required = false)
  5. void setConfigurers(Collection<AsyncConfigurer> configurers) {
  6.   if (CollectionUtils.isEmpty(configurers)) {
  7.     return;
  8.   }
  9.   if (configurers.size() > 1) {
  10.     throw new IllegalStateException("Only one AsyncConfigurer may exist");
  11.   }
  12.   AsyncConfigurer configurer = configurers.iterator().next();
  13.   this.executor = configurer::getAsyncExecutor;
  14.   this.exceptionHandler = configurer::getAsyncUncaughtExceptionHandler;
  15. }

代码示例来源：origin: google/guava

  1. boolean removeEntriesIf(Predicate<? super Entry<K, Collection<V>>> predicate) {
  2.  Iterator<Entry<K, Collection<V>>> entryIterator = unfiltered.asMap().entrySet().iterator();
  3.  boolean changed = false;
  4.  while (entryIterator.hasNext()) {
  5.   Entry<K, Collection<V>> entry = entryIterator.next();
  6.   K key = entry.getKey();
  7.   Collection<V> collection = filterCollection(entry.getValue(), new ValuePredicate(key));
  8.   if (!collection.isEmpty() && predicate.apply(Maps.immutableEntry(key, collection))) {
  9.    if (collection.size() == entry.getValue().size()) {
  10.     entryIterator.remove();
  11.    } else {
  12.     collection.clear();
  13.    }
  14.    changed = true;
  15.   }
  16.  }
  17.  return changed;
  18. }

代码示例来源：origin: spring-projects/spring-framework

  1. @Test
  2. public void combine() {
  3.   HeadersRequestCondition condition1 = new HeadersRequestCondition("foo=bar");
  4.   HeadersRequestCondition condition2 = new HeadersRequestCondition("foo=baz");
  5.   HeadersRequestCondition result = condition1.combine(condition2);
  6.   Collection<HeaderExpression> conditions = result.getContent();
  7.   assertEquals(2, conditions.size());
  8. }

代码示例来源：origin: google/guava

  1. static void checkEmpty(Collection<?> collection) {
  2.   assertTrue(collection.isEmpty());
  3.   assertEquals(0, collection.size());
  4.   assertFalse(collection.iterator().hasNext());
  5.   assertThat(collection.toArray()).isEmpty();
  6.   assertThat(collection.toArray(new Object[0])).isEmpty();
  7.   if (collection instanceof Set) {
  8.    new EqualsTester()
  9.      .addEqualityGroup(ImmutableSet.of(), collection)
  10.      .addEqualityGroup(ImmutableSet.of(""))
  11.      .testEquals();
  12.   } else if (collection instanceof List) {
  13.    new EqualsTester()
  14.      .addEqualityGroup(ImmutableList.of(), collection)
  15.      .addEqualityGroup(ImmutableList.of(""))
  16.      .testEquals();
  17.   }
  18.  }
  19. }

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