本文整理了Java中com.google.common.collect.Multimap.keys()方法的一些代码示例，展示了Multimap.keys()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。Multimap.keys()方法的具体详情如下：
包路径：com.google.common.collect.Multimap
类名称：Multimap
方法名：keys

Multimap.keys介绍

[英]Returns a view collection containing the key from each key-value pair in this multimap, without collapsing duplicates. This collection has the same size as this multimap, and keys().count(k) == get(k).size() for all k.

Changes to the returned multiset will update the underlying multimap, and vice versa. However, adding to the returned collection is not possible.
[中]返回一个视图集合，其中包含此多重映射中每个键值对的键，而不折叠重复项。此集合的大小与此多重映射和键（）相同。计数（k）=获取（k）。尺寸（）适合所有k。
对返回的multiset的更改将更新基础multimap，反之亦然。但是，无法添加到返回的集合中。

代码示例

代码示例来源：origin: google/guava

@Override
Multiset<K> createKeys() {
 return fromMultimap.keys();
}

代码示例来源：origin: google/guava

@Override
public Multiset<K> keys() {
 Multiset<K> result = keys;
 if (result == null) {
  keys = result = Multisets.unmodifiableMultiset(delegate.keys());
 }
 return result;
}

代码示例来源：origin: google/guava

@Override
 Multiset<K> createKeys() {
  return Multisets.filter(unfiltered.keys(), keyPredicate);
 }
}

代码示例来源：origin: google/guava

@Override
public Multiset<K> keys() {
 return delegate().keys();
}

代码示例来源：origin: google/guava

@Override
 protected void verify(List<String> elements) {
  assertEquals(elements, Lists.newArrayList(multimap.keys()));
 }
}.test();

代码示例来源：origin: google/guava

@Override
 protected void verify(List<String> elements) {
  assertEquals(elements, Lists.newArrayList(multimap.keys()));
 }
}.test();

代码示例来源：origin: google/guava

@Override
public Multiset<K> keys() {
 synchronized (mutex) {
  if (keys == null) {
   keys = multiset(delegate().keys(), mutex);
  }
  return keys;
 }
}

代码示例来源：origin: google/guava

@Override
protected Iterator<String> newTargetIterator() {
 multimap = LinkedHashMultimap.create();
 multimap.putAll("foo", asList(2, 3));
 multimap.putAll("bar", asList(4, 5));
 multimap.putAll("foo", asList(6));
 return multimap.keys().iterator();
}

代码示例来源：origin: google/guava

@Override
protected Iterator<String> newTargetIterator() {
 multimap = create();
 multimap.putAll("foo", asList(2, 3));
 multimap.putAll("bar", asList(4, 5));
 multimap.putAll("foo", asList(6));
 return multimap.keys().iterator();
}

代码示例来源：origin: google/guava

@MapFeature.Require(SUPPORTS_REMOVE)
public void testKeysRemove() {
 int original = multimap().keys().remove(k0(), 1);
 assertEquals(Math.max(original - 1, 0), multimap().get(k0()).size());
}

代码示例来源：origin: google/guava

@CollectionSize.Require(ONE)
@CollectionFeature.Require(SUPPORTS_ITERATOR_REMOVE)
public void testKeysEntrySetIteratorRemove() {
 Multiset<K> keys = multimap().keys();
 Iterator<Multiset.Entry<K>> itr = keys.entrySet().iterator();
 assertEquals(Multisets.immutableEntry(k0(), 1), itr.next());
 itr.remove();
 assertTrue(multimap().isEmpty());
}

代码示例来源：origin: google/guava

@MapFeature.Require(SUPPORTS_REMOVE)
public void testClearThroughKeys() {
 multimap().keys().clear();
 assertCleared();
}

代码示例来源：origin: google/guava

@MapFeature.Require(ALLOWS_NULL_KEY_QUERIES)
public void testKeysCountAbsentNullKey() {
 assertEquals(0, multimap().keys().count(null));
}

代码示例来源：origin: google/guava

public void testLinkedKeys() {
 Multimap<String, Integer> map = create();
 map.put("bar", 1);
 map.put("foo", 2);
 map.put("bar", 3);
 map.put("bar", 4);
 assertEquals("[bar=1, foo=2, bar=3, bar=4]", map.entries().toString());
 assertThat(map.keys()).containsExactly("bar", "foo", "bar", "bar").inOrder();
 map.keys().remove("bar"); // bar is no longer the first key!
 assertEquals("{foo=[2], bar=[3, 4]}", map.toString());
}

代码示例来源：origin: google/guava

@CollectionSize.Require(SEVERAL)
 public void testSizeMultipleValues() {
  resetContainer(mapEntry(k0(), v0()), mapEntry(k0(), v1()), mapEntry(k0(), v2()));

  assertEquals(3, multimap().size());
  assertEquals(3, multimap().entries().size());
  assertEquals(3, multimap().keys().size());

  assertEquals(1, multimap().keySet().size());
  assertEquals(1, multimap().asMap().size());
 }
}

代码示例来源：origin: google/guava

@GwtIncompatible // SerializableTester
public void testSerialization() {
 Multimap<String, Integer> multimap = createMultimap();
 SerializableTester.reserializeAndAssert(multimap);
 assertEquals(multimap.size(), SerializableTester.reserialize(multimap).size());
 SerializableTester.reserializeAndAssert(multimap.get("foo"));
 LenientSerializableTester.reserializeAndAssertLenient(multimap.keySet());
 LenientSerializableTester.reserializeAndAssertLenient(multimap.keys());
 SerializableTester.reserializeAndAssert(multimap.asMap());
 Collection<Integer> valuesCopy = SerializableTester.reserialize(multimap.values());
 assertEquals(HashMultiset.create(multimap.values()), HashMultiset.create(valuesCopy));
}

代码示例来源：origin: google/guava

@GwtIncompatible // SerializableTester
public void testSerialization() {
 Multimap<String, Integer> multimap = createMultimap();
 SerializableTester.reserializeAndAssert(multimap);
 assertEquals(multimap.size(), SerializableTester.reserialize(multimap).size());
 SerializableTester.reserializeAndAssert(multimap.get("foo"));
 LenientSerializableTester.reserializeAndAssertLenient(multimap.keySet());
 LenientSerializableTester.reserializeAndAssertLenient(multimap.keys());
 SerializableTester.reserializeAndAssert(multimap.asMap());
 Collection<Integer> valuesCopy = SerializableTester.reserialize(multimap.values());
 assertEquals(HashMultiset.create(multimap.values()), HashMultiset.create(valuesCopy));
}

代码示例来源：origin: google/guava

public void testKeysToString_ordering() {
 Multimap<String, Integer> multimap = initializeMultimap5();
 assertEquals("[foo x 2, bar x 2, cow]", multimap.keys().toString());
}

代码示例来源：origin: google/guava

@CollectionSize.Require(SEVERAL)
 @MapFeature.Require(SUPPORTS_REMOVE)
 public void testKeysEntrySetRemove() {
  resetContainer(
    Helpers.mapEntry(k0(), v0()), Helpers.mapEntry(k0(), v1()), Helpers.mapEntry(k1(), v0()));
  assertTrue(multimap().keys().entrySet().remove(Multisets.immutableEntry(k0(), 2)));
  assertEquals(1, multimap().size());
  assertTrue(multimap().containsEntry(k1(), v0()));
 }
}

代码示例来源：origin: google/guava

@CollectionSize.Require(SEVERAL)
public void testKeys() {
 resetContainer(
   Helpers.mapEntry(k0(), v0()), Helpers.mapEntry(k0(), v1()), Helpers.mapEntry(k1(), v0()));
 Multiset<K> keys = multimap().keys();
 assertEquals(2, keys.count(k0()));
 assertEquals(1, keys.count(k1()));
 assertEquals(3, keys.size());
 assertContainsAllOf(keys, k0(), k1());
 assertContainsAllOf(
   keys.entrySet(), Multisets.immutableEntry(k0(), 2), Multisets.immutableEntry(k1(), 1));
}