java.util.stream.Collectors.toCollection()方法的使用及代码示例

x33g5p2x  于2022-01-17 转载在 其他  
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本文整理了Java中java.util.stream.Collectors.toCollection()方法的一些代码示例，展示了Collectors.toCollection()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。Collectors.toCollection()方法的具体详情如下：
包路径：java.util.stream.Collectors
类名称：Collectors
方法名：toCollection

Collectors.toCollection介绍

暂无

代码示例

代码示例来源：origin: ctripcorp/apollo

  1. public static List<OpenNamespaceDTO> batchTransformFromNamespaceBOs(List<NamespaceBO>
  2.                                     namespaceBOs) {
  3.  if (CollectionUtils.isEmpty(namespaceBOs)) {
  4.   return Collections.emptyList();
  5.  }
  6.  List<OpenNamespaceDTO> openNamespaceDTOs =
  7.    namespaceBOs.stream().map(OpenApiBeanUtils::transformFromNamespaceBO)
  8.      .collect(Collectors.toCollection(LinkedList::new));
  9.  return openNamespaceDTOs;
  10. }

代码示例来源：origin: jersey/jersey

  1. private static <T> Set<T> getProviderClasses(final Collection<ServiceHolder<T>> providers) {
  2.   return providers.stream()
  3.           .map(Providers::holder2service)
  4.           .collect(Collectors.toCollection(LinkedHashSet::new));
  5. }

代码示例来源：origin: apache/storm

  1. /**
  2.  * Return a set of all worker directories in root log directory.
  3.  */
  4. public Set<File> getAllWorkerDirs() {
  5.   File[] rootDirFiles = logRootDir.listFiles();
  6.   if (rootDirFiles != null) {
  7.     return Arrays.stream(rootDirFiles).flatMap(topoDir -> {
  8.       File[] topoFiles = topoDir.listFiles();
  9.       return topoFiles != null ? Arrays.stream(topoFiles) : Stream.empty();
  10.     }).collect(toCollection(TreeSet::new));
  11.   }
  12.   return new TreeSet<>();
  13. }

代码示例来源：origin: org.assertj/assertj-core

  1. /**
  2.  * Returns the declared fields of a given class excluding any synthetic or static fields.
  3.  *
  4.  * Synthetic fields are fields that are generated by the compiler for access purposes, or by instrumentation tools e.g. JaCoCo adds in a $jacocoData field
  5.  * and therefore should be ignored when comparing fields.
  6.  *
  7.  * Static fields are used as constants, and are not associated with an object.
  8.  *
  9.  * @param clazz the class we want the declared fields.
  10.  * @return the declared fields of given class excluding any synthetic fields.
  11.  */
  12. private static Set<Field> getDeclaredFieldsIgnoringSyntheticAndStatic(Class<?> clazz) {
  13.  return stream(clazz.getDeclaredFields()).filter(field -> !(field.isSynthetic()
  14.                                || Modifier.isStatic(field.getModifiers())))
  15.                      .collect(toCollection(LinkedHashSet::new));
  16. }

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

  1. public static int run() {
  2.   List<Integer> integers = Arrays.asList(1, 2, 3);
  3.   List<Integer> collected = integers.stream().collect(Collectors.toCollection(ArrayList::new));
  4.   return collected.size();
  5. }

代码示例来源：origin: Graylog2/graylog2-server

  1. private static ReferenceList toReferenceList(Collection<Object> list) {
  2.   // TODO: Support nested objects in list
  3.   return list.stream()
  4.       .map(ValueReference::of)
  5.       .filter(Objects::nonNull)
  6.       .collect(Collectors.toCollection(ReferenceList::new));
  7. }

代码示例来源：origin: jersey/jersey

  1. private static <T> Set<T> getProviderClasses(final Collection<ServiceHolder<T>> providers) {
  2.   return providers.stream()
  3.           .map(Providers::holder2service)
  4.           .collect(Collectors.toCollection(LinkedHashSet::new));
  5. }

代码示例来源：origin: gocd/gocd

  1. public RolesConfig ofType(String pluginType) throws InvalidPluginTypeException {
  2.     if (isBlank(pluginType)) {
  3.       return this;
  4.     }
  6.     Class<? extends Role> roleClass = ROLE_FILTER_MAP.get(pluginType);
  8.     if (roleClass == null) {
  9.       throw new InvalidPluginTypeException("Bad role type `" + pluginType + "`. Valid values are " + StringUtils.join(ROLE_FILTER_MAP.keySet(), ", "));
  10.     }
  12.     return this.stream().filter(role -> role.getClass().isAssignableFrom(roleClass)).collect(Collectors.toCollection(RolesConfig::new));
  14.   }
  15. }

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

  1. public static int run() {
  2.   List<Integer> integers = Arrays.asList(1, 2, 3, 4);
  3.   List<Integer> collected = integers.stream().collect(Collectors.toCollection(ArrayList::new));
  4.   return collected.size();
  5. }

代码示例来源：origin: apache/storm

  1. @VisibleForTesting
  2. Set<File> selectDirsForCleanup(long nowMillis) {
  3.   FileFilter fileFilter = mkFileFilterForLogCleanup(nowMillis);
  4.   return Arrays.stream(logRootDir.listFiles())
  5.       .flatMap(topoDir -> Arrays.stream(topoDir.listFiles(fileFilter)))
  6.       .collect(toCollection(TreeSet::new));
  7. }

代码示例来源：origin: org.assertj/assertj-core

  1. private static Set<String> fieldsToName(Set<Field> fields) {
  2.  return fields.stream().map(Field::getName).collect(toCollection(LinkedHashSet::new));
  3. }

代码示例来源：origin: apache/incubator-druid

  1. SegmentsCostCache(ArrayList<Bucket> sortedBuckets)
  2. {
  3.  this.sortedBuckets = Preconditions.checkNotNull(sortedBuckets, "buckets should not be null");
  4.  this.intervals = sortedBuckets.stream().map(Bucket::getInterval).collect(Collectors.toCollection(ArrayList::new));
  5.  Preconditions.checkArgument(
  6.    BUCKET_ORDERING.isOrdered(sortedBuckets),
  7.    "buckets must be ordered by interval"
  8.  );
  9. }

代码示例来源：origin: joel-costigliola/assertj-core

  1. /**
  2.  * Returns the declared fields of a given class excluding any synthetic or static fields.
  3.  *
  4.  * Synthetic fields are fields that are generated by the compiler for access purposes, or by instrumentation tools e.g. JaCoCo adds in a $jacocoData field
  5.  * and therefore should be ignored when comparing fields.
  6.  *
  7.  * Static fields are used as constants, and are not associated with an object.
  8.  *
  9.  * @param clazz the class we want the declared fields.
  10.  * @return the declared fields of given class excluding any synthetic fields.
  11.  */
  12. private static Set<Field> getDeclaredFieldsIgnoringSyntheticAndStatic(Class<?> clazz) {
  13.  return stream(clazz.getDeclaredFields()).filter(field -> !(field.isSynthetic()
  14.                                || Modifier.isStatic(field.getModifiers())))
  15.                      .collect(toCollection(LinkedHashSet::new));
  16. }

代码示例来源：origin: shekhargulati/99-problems

  1. public static <T> T kthStream(final List<T> list, final int k) {
  2.   return list.stream().limit(k + 1).collect(Collectors.toCollection(LinkedList::new)).getLast();
  3. }

代码示例来源：origin: org.assertj/assertj-core

  1. /**
  2.  * Creates a <em>mutable</em> {@link ArrayList} containing the given elements.
  3.  *
  4.  * @param <T> the generic type of the {@code ArrayList} to create.
  5.  * @param elements the elements to store in the {@code ArrayList}.
  6.  * @return the created {@code ArrayList}, or {@code null} if the given {@code Iterator} is {@code null}.
  7.  */
  8. public static <T> ArrayList<T> newArrayList(Iterator<? extends T> elements) {
  9.  if (elements == null) {
  10.   return null;
  11.  }
  12.  return Streams.stream(elements).collect(toCollection(ArrayList::new));
  13. }

代码示例来源：origin: prestodb/presto

  1. @VisibleForTesting
  2. JoinEnumerationResult createJoinAccordingToPartitioning(LinkedHashSet<PlanNode> sources, List<Symbol> outputSymbols, Set<Integer> partitioning)
  3. {
  4.   List<PlanNode> sourceList = ImmutableList.copyOf(sources);
  5.   LinkedHashSet<PlanNode> leftSources = partitioning.stream()
  6.       .map(sourceList::get)
  7.       .collect(toCollection(LinkedHashSet::new));
  8.   LinkedHashSet<PlanNode> rightSources = sources.stream()
  9.       .filter(source -> !leftSources.contains(source))
  10.       .collect(toCollection(LinkedHashSet::new));
  11.   return createJoin(leftSources, rightSources, outputSymbols);
  12. }

代码示例来源：origin: SonarSource/sonarqube

  1. private static Set<String> getRootQualifiers(ResourceTypes resourceTypes) {
  2.  return resourceTypes.getRoots().stream()
  3.   .map(ResourceType::getQualifier)
  4.   .collect(Collectors.toCollection(TreeSet::new));
  5. }

代码示例来源：origin: org.assertj/assertj-core

  1. private void assertIterableContainsGivenValues(Iterable<?> actual, Object[] values, AssertionInfo info) {
  2.  Set<Object> notFound = stream(values).filter(value -> !iterableContains(actual, value))
  3.                     .collect(toCollection(LinkedHashSet::new));
  4.  if (notFound.isEmpty())
  5.   return;
  6.  throw failures.failure(info, shouldContain(actual, values, notFound, comparisonStrategy));
  7. }

代码示例来源：origin: org.springframework.boot/spring-boot

  1. /**
  2.  * Return the classes from all the specified configurations in the order that they
  3.  * would be registered.
  4.  * @param configurations the source configuration
  5.  * @return configuration classes in registration order
  6.  */
  7. public static Class<?>[] getClasses(Collection<Configurations> configurations) {
  8.   List<Configurations> ordered = new ArrayList<>(configurations);
  9.   ordered.sort(COMPARATOR);
  10.   List<Configurations> collated = collate(ordered);
  11.   LinkedHashSet<Class<?>> classes = collated.stream()
  12.       .flatMap(Configurations::streamClasses)
  13.       .collect(Collectors.toCollection(LinkedHashSet::new));
  14.   return ClassUtils.toClassArray(classes);
  15. }

代码示例来源：origin: org.assertj/assertj-core

  1. /**
  2.  * Creates a <em>mutable</em> {@code HashSet} containing the given elements.
  3.  *
  4.  * @param <T> the generic type of the {@code HashSet} to create.
  5.  * @param elements the elements to store in the {@code HashSet}.
  6.  * @return the created {@code HashSet}, or {@code null} if the given array of elements is {@code null}.
  7.  */
  8. public static <T> HashSet<T> newHashSet(Iterable<? extends T> elements) {
  9.  if (elements == null) {
  10.   return null;
  11.  }
  12.  return Streams.stream(elements).collect(toCollection(HashSet::new));
  13. }

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