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

Iterator.remove介绍

[英]Removes the last object returned by next from the collection. This method can only be called once between each call to next.
[中]从集合中删除next返回的最后一个对象。此方法只能在每次调用下一次之间调用一次。

代码示例

代码示例来源：origin: stackoverflow.com

  1. public static void printMap(Map mp) {
  2.   Iterator it = mp.entrySet().iterator();
  3.   while (it.hasNext()) {
  4.     Map.Entry pair = (Map.Entry)it.next();
  5.     System.out.println(pair.getKey() + " = " + pair.getValue());
  6.     it.remove(); // avoids a ConcurrentModificationException
  7.   }
  8. }

代码示例来源：origin: stackoverflow.com

  1. List<String> list = new ArrayList<>();
  3. // This is a clever way to create the iterator and call iterator.hasNext() like
  4. // you would do in a while-loop. It would be the same as doing:
  5. //     Iterator<String> iterator = list.iterator();
  6. //     while (iterator.hasNext()) {
  7. for (Iterator<String> iterator = list.iterator(); iterator.hasNext();) {
  8.   String string = iterator.next();
  9.   if (string.isEmpty()) {
  10.     // Remove the current element from the iterator and the list.
  11.     iterator.remove();
  12.   }
  13. }

代码示例来源：origin: iluwatar/java-design-patterns

  1. private void processPendingCommands() {
  2.  Iterator<Runnable> iterator = pendingCommands.iterator();
  3.  while (iterator.hasNext()) {
  4.   Runnable command = iterator.next();
  5.   command.run();
  6.   iterator.remove();
  7.  }
  8. }

代码示例来源：origin: google/guava

  1. @CollectionSize.Require(ONE)
  2. @CollectionFeature.Require(SUPPORTS_ITERATOR_REMOVE)
  3. public void testEntrySetIteratorRemove() {
  4.  Set<Entry<K, V>> entrySet = getMap().entrySet();
  5.  Iterator<Entry<K, V>> entryItr = entrySet.iterator();
  6.  assertEquals(e0(), entryItr.next());
  7.  entryItr.remove();
  8.  assertTrue(getMap().isEmpty());
  9.  assertFalse(entrySet.contains(e0()));
  10. }

代码示例来源：origin: google/guava

  1. public void testTransformRemove() {
  2.  List<String> list = Lists.newArrayList("1", "2", "3");
  3.  Iterator<String> input = list.iterator();
  4.  Iterator<Integer> iterator =
  5.    Iterators.transform(
  6.      input,
  7.      new Function<String, Integer>() {
  8.       @Override
  9.       public Integer apply(String from) {
  10.        return Integer.valueOf(from);
  11.       }
  12.      });
  13.  assertEquals(Integer.valueOf(1), iterator.next());
  14.  assertEquals(Integer.valueOf(2), iterator.next());
  15.  iterator.remove();
  16.  assertEquals(asList("1", "3"), list);
  17. }

代码示例来源：origin: google/guava

  1. @CollectionFeature.Require(SUPPORTS_ITERATOR_REMOVE)
  2. @CollectionSize.Require(absent = ZERO)
  3. public void testIterator_removeAffectsBackingCollection() {
  4.  int originalSize = collection.size();
  5.  Iterator<E> iterator = collection.iterator();
  6.  Object element = iterator.next();
  7.  // If it's an Entry, it may become invalid once it's removed from the Map. Copy it.
  8.  if (element instanceof Entry) {
  9.   Entry<?, ?> entry = (Entry<?, ?>) element;
  10.   element = mapEntry(entry.getKey(), entry.getValue());
  11.  }
  12.  assertTrue(collection.contains(element)); // sanity check
  13.  iterator.remove();
  14.  assertFalse(collection.contains(element));
  15.  assertEquals(originalSize - 1, collection.size());
  16. }

代码示例来源：origin: google/guava

  1. public void testCycleRemoveWithoutNext() {
  2.  Iterator<String> cycle = Iterators.cycle("a", "b");
  3.  assertTrue(cycle.hasNext());
  4.  try {
  5.   cycle.remove();
  6.   fail("no exception thrown");
  7.  } catch (IllegalStateException expected) {
  8.  }
  9. }

代码示例来源：origin: google/guava

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

代码示例来源：origin: skylot/jadx

  1. public static void remove(List<InsnNode> list, InsnNode insn) {
  2.   for (Iterator<InsnNode> iterator = list.iterator(); iterator.hasNext(); ) {
  3.     InsnNode next = iterator.next();
  4.     if (next == insn) {
  5.       iterator.remove();
  6.       return;
  7.     }
  8.   }
  9. }

代码示例来源：origin: google/guava

  1. /** Clears the iterator using its remove method. */
  2. static void clear(Iterator<?> iterator) {
  3.  checkNotNull(iterator);
  4.  while (iterator.hasNext()) {
  5.   iterator.next();
  6.   iterator.remove();
  7.  }
  8. }

代码示例来源：origin: google/guava

  1. @CollectionSize.Require(SEVERAL)
  2.  @CollectionFeature.Require(SUPPORTS_ITERATOR_REMOVE)
  3.  public void testAsMapEntrySetIteratorRemovePropagatesToMultimap() {
  4.   resetContainer(Helpers.mapEntry(k0(), v0()), Helpers.mapEntry(k0(), v3()));
  5.   Set<Entry<K, Collection<V>>> asMapEntrySet = multimap().asMap().entrySet();
  6.   Iterator<Entry<K, Collection<V>>> asMapEntryItr = asMapEntrySet.iterator();
  7.   asMapEntryItr.next();
  8.   asMapEntryItr.remove();
  9.   assertTrue(multimap().isEmpty());
  10.  }
  11. }

代码示例来源：origin: ReactiveX/RxJava

  1. @Test(expected = UnsupportedOperationException.class)
  2. public void toFlowableIterableRemove() {
  3.   @SuppressWarnings("unchecked")
  4.   Iterable<? extends Flowable<Integer>> f = SingleInternalHelper.iterableToFlowable(Arrays.asList(Single.just(1)));
  5.   Iterator<? extends Flowable<Integer>> iterator = f.iterator();
  6.   iterator.next();
  7.   iterator.remove();
  8. }

代码示例来源：origin: google/guava

  1. @Override
  2. public boolean retainAll(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: redisson/redisson

  1. @Override
  2.   public void accept(List<T> bucket) {
  3.     Iterator<List<T>> it = buckets.iterator();
  4.     while (it.hasNext()) {
  5.       List<T> itBucket = it.next();
  6.       if (bucket == itBucket) {
  7.         it.remove();
  8.         broadcastNext(bucket);
  9.         break;
  10.       }
  11.     }
  12.   }
  13. };

代码示例来源：origin: stackoverflow.com

  1. Iterator<Map.Entry<String,String>> iter = TestMap.entrySet().iterator();
  2. while (iter.hasNext()) {
  3.   Map.Entry<String,String> entry = iter.next();
  4.   if("Sample".equalsIgnoreCase(entry.getValue())){
  5.     iter.remove();
  6.   }
  7. }

代码示例来源：origin: google/guava

  1. public void testIdentityKeySetIteratorRemove() {
  2.  BiMap<Integer, String> bimap =
  3.    new AbstractBiMap<Integer, String>(
  4.      new IdentityHashMap<Integer, String>(), new IdentityHashMap<String, Integer>()) {};
  5.  bimap.put(1, "one");
  6.  bimap.put(2, "two");
  7.  bimap.put(3, "three");
  8.  Iterator<Integer> iterator = bimap.keySet().iterator();
  9.  iterator.next();
  10.  iterator.next();
  11.  iterator.remove();
  12.  iterator.next();
  13.  iterator.remove();
  14.  assertEquals(1, bimap.size());
  15.  assertEquals(1, bimap.inverse().size());
  16. }

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: skylot/jadx

  1. private static void removeInsn(MethodNode mth, BlockNode block, PhiInsn phiInsn) {
  2.   Iterator<InsnNode> it = block.getInstructions().iterator();
  3.   while (it.hasNext()) {
  4.     InsnNode insn = it.next();
  5.     if (insn == phiInsn) {
  6.       it.remove();
  7.       return;
  8.     }
  9.   }
  10.   LOG.warn("Phi node not removed: {}, mth: {}", phiInsn, mth);
  11. }

代码示例来源：origin: google/guava

  1. /**
  2.  * Deletes and returns the next value from the iterator, or returns {@code null} if there is no
  3.  * such value.
  4.  */
  5. static <T> @Nullable T pollNext(Iterator<T> iterator) {
  6.  if (iterator.hasNext()) {
  7.   T result = iterator.next();
  8.   iterator.remove();
  9.   return result;
  10.  } else {
  11.   return null;
  12.  }
  13. }

代码示例来源：origin: google/guava

  1. public void testBiMapEntrySetIteratorRemove() {
  2.  BiMap<Integer, String> map = HashBiMap.create();
  3.  map.put(1, "one");
  4.  Set<Entry<Integer, String>> entries = map.entrySet();
  5.  Iterator<Entry<Integer, String>> iterator = entries.iterator();
  6.  Entry<Integer, String> entry = iterator.next();
  7.  entry.setValue("two"); // changes the iterator's current entry value
  8.  assertEquals("two", map.get(1));
  9.  assertEquals(Integer.valueOf(1), map.inverse().get("two"));
  10.  iterator.remove(); // removes the updated entry
  11.  assertTrue(map.isEmpty());
  12. }

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