java.util.Collection.contains()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.contains()方法的一些代码示例，展示了Collection.contains()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.contains()方法的具体详情如下：
包路径：java.util.Collection
类名称：Collection
方法名：contains

Collection.contains介绍

[英]Tests whether this Collection contains the specified object. Returns true if and only if at least one element elem in this Collection meets following requirement: (object==null ? elem==null : object.equals(elem)).
[中]测试此集合是否包含指定的对象。当且仅当此集合中至少有一个元素elem满足以下要求时返回true：（object==null？elem==null:object.equals（elem））。

代码示例

代码示例来源：origin: google/guava

  1. @Override
  2. public boolean removeAll(Collection<?> collection) {
  3.  Iterator<Entry<K, V>> entryItr = unfiltered.entrySet().iterator();
  4.  boolean result = false;
  5.  while (entryItr.hasNext()) {
  6.   Entry<K, V> entry = entryItr.next();
  7.   if (predicate.apply(entry) && collection.contains(entry.getValue())) {
  8.    entryItr.remove();
  9.    result = true;
  10.   }
  11.  }
  12.  return result;
  13. }

代码示例来源：origin: Atmosphere/atmosphere

  1. @Override
  2. public Broadcaster addBroadcasterListener(BroadcasterListener b) {
  3.   if (!sharedListeners && !broadcasterListeners.contains(b)) {
  4.     broadcasterListeners.add(b);
  5.   }
  6.   return this;
  7. }

代码示例来源：origin: apache/ignite

  1. @Override public boolean apply(T t) {
  2.     return (!(c == null || c.isEmpty())) && c.contains(t);
  3.   }
  4. };

代码示例来源：origin: apache/incubator-shardingsphere

  1. @Override
  2. public RoutingResult route() {
  3.   Collection<RoutingResult> result = new ArrayList<>(logicTables.size());
  4.   Collection<String> bindingTableNames = new TreeSet<>(String.CASE_INSENSITIVE_ORDER);
  5.   for (String each : logicTables) {
  6.     Optional<TableRule> tableRule = shardingRule.findTableRule(each);
  7.     if (tableRule.isPresent()) {
  8.       if (!bindingTableNames.contains(each)) {
  9.         result.add(new StandardRoutingEngine(shardingRule, tableRule.get().getLogicTable(), shardingConditions).route());
  10.   if (result.isEmpty()) {
  11.     throw new ShardingException("Cannot find table rule and default data source with logic tables: '%s'", logicTables);
  12.   if (1 == result.size()) {
  13.     return result.iterator().next();

代码示例来源：origin: google/guava

  1. public void testValuesRemoveAll() {
  2.  final Map<K, V> map;
  3.  try {
  4.   map = makePopulatedMap();
  5.  } catch (UnsupportedOperationException e) {
  6.   return;
  7.  }
  8.  Collection<V> valueCollection = map.values();
  9.  Set<V> valuesToRemove = singleton(valueCollection.iterator().next());
  10.  if (supportsRemove) {
  11.   valueCollection.removeAll(valuesToRemove);
  12.   for (V value : valuesToRemove) {
  13.    assertFalse(valueCollection.contains(value));
  14.   }
  15.   for (V value : valueCollection) {
  16.    assertFalse(valuesToRemove.contains(value));
  17.   }
  18.  } else {
  19.   try {
  20.    valueCollection.removeAll(valuesToRemove);
  21.    fail("Expected UnsupportedOperationException.");
  22.   } catch (UnsupportedOperationException expected) {
  23.   }
  24.  }
  25.  assertInvariants(map);
  26. }

代码示例来源：origin: google/guava

  1. assertEquals(map.size(), keySet.size());
  2. assertEquals(keySet.size() == 0, keySet.isEmpty());
  3. assertEquals(!keySet.isEmpty(), keySet.iterator().hasNext());
  4.  assertTrue(map.containsKey(key));
  5.  assertTrue(map.containsValue(value));
  6.  assertTrue(valueCollection.contains(value));
  7.  assertTrue(valueCollection.containsAll(Collections.singleton(value)));
  8.  assertTrue(entrySet.contains(mapEntry(key, value)));
  9. assertEquals(map.size(), valueCollection.size());
  10. assertEquals(valueCollection.size() == 0, valueCollection.isEmpty());
  11. assertEquals(!valueCollection.isEmpty(), valueCollection.iterator().hasNext());
  12. for (V value : valueCollection) {
  13.  assertTrue(map.containsValue(value));
  14. assertEquals(!entrySet.isEmpty(), entrySet.iterator().hasNext());
  15. assertEntrySetNotContainsString(entrySet);

代码示例来源：origin: apache/incubator-shardingsphere

  1. private List<ShardingValue> getShardingValuesFromShardingConditions(final Collection<String> shardingColumns, final ShardingCondition shardingCondition) {
  2.   List<ShardingValue> result = new ArrayList<>(shardingColumns.size());
  3.   for (ShardingValue each : shardingCondition.getShardingValues()) {
  4.     Optional<BindingTableRule> bindingTableRule = shardingRule.findBindingTableRule(logicTableName);
  5.     if ((logicTableName.equals(each.getLogicTableName()) || bindingTableRule.isPresent() && bindingTableRule.get().hasLogicTable(logicTableName)) 
  6.         && shardingColumns.contains(each.getColumnName())) {
  7.       result.add(each);
  8.     }
  9.   }
  10.   return result;
  11. }

代码示例来源：origin: commons-collections/commons-collections

  1. public void testIterator() {
  2.   setUpTest();
  3.   one.add("1");
  4.   two.add("2");
  5.   c.addComposited(one);
  6.   c.addComposited(two);
  7.   Iterator i = c.iterator();
  8.   Object next = i.next();
  9.   assertTrue(c.contains(next));
  10.   assertTrue(one.contains(next));
  11.   next = i.next();
  12.   i.remove();
  13.   assertTrue(!c.contains(next));
  14.   assertTrue(!two.contains(next));
  15. }

代码示例来源：origin: apache/hive

  1. private static Collection<String> catalogsToCache(RawStore rs) throws MetaException {
  2.  Collection<String> confValue =
  3.    MetastoreConf.getStringCollection(rs.getConf(), ConfVars.CATALOGS_TO_CACHE);
  4.  if (confValue == null || confValue.isEmpty() ||
  5.    (confValue.size() == 1 && confValue.contains(""))) {
  6.   return rs.getCatalogs();
  7.  } else {
  8.   return confValue;
  9.  }
  10. }

代码示例来源：origin: google/guava

  1. public void testPermutationSetEmpty() {
  2.  Collection<List<Integer>> permutationSet =
  3.    Collections2.permutations(Collections.<Integer>emptyList());
  4.  assertEquals(1, permutationSet.size());
  5.  assertTrue(permutationSet.contains(Collections.<Integer>emptyList()));
  6.  Iterator<List<Integer>> permutations = permutationSet.iterator();
  7.  assertNextPermutation(Collections.<Integer>emptyList(), permutations);
  8.  assertNoMorePermutations(permutations);
  9. }

代码示例来源：origin: commons-collections/commons-collections

  1. public void testTransformedCollection() {
  2.   Collection coll = TransformedCollection.decorate(new ArrayList(), STRING_TO_INTEGER_TRANSFORMER);
  3.   assertEquals(0, coll.size());
  4.   Object[] els = getFullElements();
  5.   for (int i = 0; i < els.length; i++) {
  6.     coll.add(els[i]);
  7.     assertEquals(i + 1, coll.size());
  8.     assertEquals(true, coll.contains(new Integer((String) els[i])));
  9.     assertEquals(false, coll.contains(els[i]));
  10.   }
  11.   
  12.   assertEquals(true, coll.remove(new Integer((String) els[0])));
  13. }

代码示例来源：origin: MovingBlocks/Terasology

  1. @Test
  2. public void testCollectionMethods() {
  3.   Collection<Integer> buffer = CircularBuffer.create(4);
  4.   buffer.addAll(ImmutableList.of(1, 2, 3, 4, 5, 6));
  5.   buffer.add(4);
  6.   assertTrue(buffer.contains(5));
  7.   assertTrue(buffer.containsAll(ImmutableList.of(5, 4)));
  8. }

代码示例来源：origin: google/guava

  1. static <K, V> boolean retainAllKeys(
  2.   Map<K, V> map, Predicate<? super Entry<K, V>> entryPredicate, Collection<?> keyCollection) {
  3.  Iterator<Entry<K, V>> entryItr = map.entrySet().iterator();
  4.  boolean result = false;
  5.  while (entryItr.hasNext()) {
  6.   Entry<K, V> entry = entryItr.next();
  7.   if (entryPredicate.apply(entry) && !keyCollection.contains(entry.getKey())) {
  8.    entryItr.remove();
  9.    result = true;
  10.   }
  11.  }
  12.  return result;
  13. }

代码示例来源：origin: apache/storm

  1. if (freeSlots.isEmpty()) {
  2.   throw new IllegalStateException("Trying to assign to a full node " + nodeId);
  3. if (executors.size() == 0) {
  4.   LOG.warn("Trying to assign nothing from " + td.getId() + " to " + nodeId + " (Ignored)");
  5.   target = getFreeSlots().iterator().next();
  6. if (!freeSlots.contains(target)) {
  7.   throw new IllegalStateException(
  8.     "Trying to assign already used slot " + target.getPort() + " on node " + nodeId);

代码示例来源：origin: google/guava

  1. public void testValuesRetainAll() {
  2.  final Map<K, V> map;
  3.  try {
  4.   map = makePopulatedMap();
  5.  } catch (UnsupportedOperationException e) {
  6.   return;
  7.  }
  8.  Collection<V> valueCollection = map.values();
  9.  Set<V> valuesToRetain = singleton(valueCollection.iterator().next());
  10.  if (supportsRemove) {
  11.   valueCollection.retainAll(valuesToRetain);
  12.   for (V value : valuesToRetain) {
  13.    assertTrue(valueCollection.contains(value));
  14.   }
  15.   for (V value : valueCollection) {
  16.    assertTrue(valuesToRetain.contains(value));
  17.   }
  18.  } else {
  19.   try {
  20.    valueCollection.retainAll(valuesToRetain);
  21.    fail("Expected UnsupportedOperationException.");
  22.   } catch (UnsupportedOperationException expected) {
  23.   }
  24.  }
  25.  assertInvariants(map);
  26. }

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

  1. @Override
  2. protected void initServletContext(ServletContext servletContext) {
  3.   Collection<ViewResolver> matchingBeans =
  4.       BeanFactoryUtils.beansOfTypeIncludingAncestors(obtainApplicationContext(), ViewResolver.class).values();
  5.   if (this.viewResolvers == null) {
  6.     this.viewResolvers = new ArrayList<>(matchingBeans.size());
  7.     for (ViewResolver viewResolver : matchingBeans) {
  8.       if (this != viewResolver) {
  9.         this.viewResolvers.add(viewResolver);
  10.       }
  11.     }
  12.   }
  13.   else {
  14.     for (int i = 0; i < this.viewResolvers.size(); i++) {
  15.       ViewResolver vr = this.viewResolvers.get(i);
  16.       if (matchingBeans.contains(vr)) {
  17.         continue;
  18.       }
  19.       String name = vr.getClass().getName() + i;
  20.       obtainApplicationContext().getAutowireCapableBeanFactory().initializeBean(vr, name);
  21.     }
  22.   }
  23.   AnnotationAwareOrderComparator.sort(this.viewResolvers);
  24.   this.cnmFactoryBean.setServletContext(servletContext);
  25. }

代码示例来源：origin: bytedeco/javacpp

  1. public void addClass(Class c) {
  2.   if (!classes.contains(c)) {
  3.     classes.add(c);
  4.   }
  5. }

代码示例来源：origin: apache/ignite

  1. /**
  2.  * @throws Exception If failed.
  3.  */
  4. @Test
  5. public void testCallAsyncMultiple() throws Exception {
  6.   Collection<ClosureTestCallable> jobs = F.asList(new ClosureTestCallable(), new ClosureTestCallable());
  7.   IgniteFuture<Collection<Integer>> fut = callAsync(0, jobs, null);
  8.   Collection<Integer> results = fut.get();
  9.   assert !results.isEmpty() : "Collection of results is empty.";
  10.   assert results.size() == jobs.size() :
  11.     "Collection of results must be of size: " + jobs.size() + ".";
  12.   for (int i = 1; i <= jobs.size(); i++)
  13.     assert results.contains(i) : "Collection of results does not contain value: " + i;
  14. }

代码示例来源：origin: SonarSource/sonarqube

  1. public static boolean isFieldNeeded(String field, @Nullable Collection<String> fields) {
  2.   return fields == null || fields.isEmpty() || fields.contains(field);
  3.  }
  4. }

代码示例来源：origin: apache/ignite

  1. /**
  2.  * @param set Set.
  3.  * @param size Expected size.
  4.  */
  5. private void assertSetContent(IgniteSet<Integer> set, int size) {
  6.   Collection<Integer> data = new HashSet<>(size);
  7.   for (Integer val : set)
  8.     assertTrue(data.add(val));
  9.   assertEquals(size, data.size());
  10.   for (int val = 0; val < size; val++)
  11.     assertTrue(data.contains(val));
  12. }

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