How to use

isEmpty

method

in

com.google.common.collect.Multiset

@Override
public boolean isEmpty() {
 return multiset1.isEmpty() && multiset2.isEmpty();
}

@Override
public boolean isEmpty() {
 return multiset1.isEmpty() && multiset2.isEmpty();
}

/** A specialization of {@code addAllImpl} for when {@code elements} is itself a Multiset. */
private static <E> boolean addAllImpl(Multiset<E> self, Multiset<? extends E> elements) {
 if (elements.isEmpty()) {
  return false;
 }
 elements.forEachEntry(self::add);
 return true;
}

@Override
public boolean isEmpty() {
 return multiset().isEmpty();
}

 @VisibleForTesting
 ImmutableMultiset<E> buildJdkBacked() {
  if (contents.isEmpty()) {
   return of();
  }
  return JdkBackedImmutableMultiset.create(contents.entrySet());
 }
}

@CollectionFeature.Require(SUPPORTS_REMOVE)
public void testEntrySet_clear() {
 getMultiset().entrySet().clear();
 assertTrue("multiset not empty after entrySet().clear()", getMultiset().isEmpty());
}

public void testCopyOf_multiset_empty() {
 Multiset<String> c = HashMultiset.create();
 Multiset<String> multiset = ImmutableMultiset.copyOf(c);
 assertTrue(multiset.isEmpty());
}

public void testCopyOf_multiset_empty() {
 Multiset<String> c = HashMultiset.create();
 Multiset<String> multiset = ImmutableSortedMultiset.copyOf(c);
 assertTrue(multiset.isEmpty());
}

public void testRemoveOccurrencesMultisetEmpty() {
 Multiset<String> multiset = HashMultiset.create();
 Multiset<String> toRemove = HashMultiset.create(Arrays.asList("a", "b", "a"));
 assertFalse(Multisets.removeOccurrences(multiset, toRemove));
 assertTrue(multiset.isEmpty());
}

public void testRetainEmptyOccurrences() {
 Multiset<String> multiset = HashMultiset.create(Arrays.asList("a", "b", "a"));
 Multiset<String> toRetain = HashMultiset.create();
 assertTrue(Multisets.retainOccurrences(multiset, toRetain));
 assertTrue(multiset.isEmpty());
}

@CollectionSize.Require(ONE)
@CollectionFeature.Require(SUPPORTS_ITERATOR_REMOVE)
public void testEntrySet_iteratorRemovePropagates() {
 Iterator<Multiset.Entry<E>> iterator = getMultiset().entrySet().iterator();
 assertTrue(
   "non-empty multiset.entrySet() iterator.hasNext() returned false", iterator.hasNext());
 assertEquals(
   "multiset.entrySet() iterator.next() returned incorrect entry",
   Multisets.immutableEntry(e0(), 1),
   iterator.next());
 assertFalse(
   "size 1 multiset.entrySet() iterator.hasNext() returned true after next()",
   iterator.hasNext());
 iterator.remove();
 assertTrue(
   "multiset isn't empty after multiset.entrySet() iterator.remove()",
   getMultiset().isEmpty());
}

public void testCreation_emptyArray() {
 String[] array = new String[0];
 Multiset<String> multiset = ImmutableMultiset.copyOf(array);
 assertTrue(multiset.isEmpty());
}

public void testRemoveOccurrencesIterableEmpty() {
 Multiset<String> multiset = HashMultiset.create();
 Iterable<String> toRemove = Arrays.asList("a", "b", "a");
 assertFalse(Multisets.removeOccurrences(multiset, toRemove));
 assertTrue(multiset.isEmpty());
}

public void testCreation_emptyArray() {
 String[] array = new String[0];
 Multiset<String> multiset = ImmutableSortedMultiset.copyOf(array);
 assertTrue(multiset.isEmpty());
}

public void testCreation_noArgs() {
 Multiset<String> multiset = ImmutableMultiset.of();
 assertTrue(multiset.isEmpty());
}

public void testCreation_noArgs() {
 Multiset<String> multiset = ImmutableSortedMultiset.of();
 assertTrue(multiset.isEmpty());
}

public void testCopyOf_iterator_empty() {
 Iterator<String> iterator = Iterators.emptyIterator();
 Multiset<String> multiset = ImmutableMultiset.copyOf(iterator);
 assertTrue(multiset.isEmpty());
}

public void testCopyOf_collection_empty() {
 // "<String>" is required to work around a javac 1.5 bug.
 Collection<String> c = MinimalCollection.<String>of();
 Multiset<String> multiset = ImmutableSortedMultiset.copyOf(c);
 assertTrue(multiset.isEmpty());
}

public void testCopyOf_collection_empty() {
 // "<String>" is required to work around a javac 1.5 bug.
 Collection<String> c = MinimalCollection.<String>of();
 Multiset<String> multiset = ImmutableMultiset.copyOf(c);
 assertTrue(multiset.isEmpty());
}

public void testCopyOf_iterator_empty() {
 Iterator<String> iterator = Iterators.emptyIterator();
 Multiset<String> multiset = ImmutableSortedMultiset.copyOf(iterator);
 assertTrue(multiset.isEmpty());
}