The following call chains are replaced by this inspection:
collection.stream().forEach()
→ collection.forEach()
collection.stream().forEachOrdered()
→ collection.forEach()
collection.stream().collect(Collectors.toList())
→ new ArrayList<>(collection)
collection.stream().collect(Collectors.toSet())
→ new HashSet<>(collection)
collection.stream().collect(Collectors.toCollection(CollectionType::new))
→ new CollectionType<>(collection)
collection.stream().toArray()
→ collection.toArray()
Arrays.asList().stream()
→ Arrays.stream()
or Stream.of()
Collections.singleton().stream()
→ Stream.of()
Collections.singletonList().stream()
→ Stream.of()
Collections.emptyList().stream()
→ Stream.empty()
Collections.emptySet().stream()
→ Stream.empty()
stream.filter().findFirst().isPresent()
→ stream.anyMatch()
stream.filter().findAny().isPresent()
→ stream.anyMatch()
stream.collect(Collectors.counting())
→ stream.count()
stream.collect(Collectors.maxBy())
→ stream.max()
stream.collect(Collectors.minBy())
→ stream.min()
stream.collect(Collectors.mapping())
→ stream.map().collect()
stream.collect(Collectors.reducing())
→ stream.reduce()
or Stream.map().reduce()
stream.collect(Collectors.summingInt())
→ stream.mapToInt().sum()
stream.collect(Collectors.summingLong())
→ stream.mapToLong().sum()
stream.collect(Collectors.summingDouble())
→ stream.mapToDouble().sum()
stream.mapToObj(x -> x)
→ stream.boxed()
!stream.anyMatch()
→ stream.noneMatch()
!stream.anyMatch(x -> !(...))
→ stream.allMatch()
!stream.noneMatch()
→ stream.anyMatch()
stream.noneMatch(x -> !(...))
→ stream.allMatch()
stream.allMatch(x -> !(...))
→ stream.noneMatch()
!stream.allMatch(x -> !(...))
→ stream.anyMatch()
Note that the replacements semantic may have minor difference in some cases.
For example, Collections.synchronizedList(...).stream().forEach()
is not
synchronized while Collections.synchronizedList(...).forEach()
is synchronized.
Or collect(Collectors.maxBy())
would return an empty Optional
if the resulting
element is null
while Stream.max()
will throw NullPointerException
in this case.