The following call chains are replaced by this inspection:
Collection.stream().forEach()
→ Collection.forEach()
Collection.stream().forEachOrdered()
→ Collection.forEach()
Collection.stream().count()
→ Collection.size()
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.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()
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.