Java Utililty Methods Stream Operation

List of utility methods to do Stream Operation

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Description

The list of methods to do Stream Operation are organized into topic(s).

Method

intmapElementsSizes(IntStream intStream)
map Elements Sizes 
OptionalInt n = intStream.reduce((a, b) -> (a == -1) ? -1 : (b == 1) ? a : (a == b) ? a : (a == 1) ? b : -1
);
return n.isPresent() ? n.getAsInt() : 1;
floatmaximum(final Stream stream)
Get Maximum X position of TextPosition List . 
return stream.max(Float::compare).get().floatValue();
longmaxLong(Stream stream)
Returns the highest value on a stream of longs 
return stream.mapToLong(Long::valueOf).max().getAsLong();
intmaxStringLength(Stream stringStream)
max String Length 
return stringStream.mapToInt(String::length).max().getAsInt();
StringmkString(Stream items, String prefix, String delimiter, String suffix)
mk String 
StringJoiner joiner = new StringJoiner(delimiter);
items.forEach(joiner::add);
return prefix + joiner.toString() + suffix;
StreamnullableStreamOf(Collection nullableCollection)
nullable Stream Of 
if (nullableCollection == null) {
    return Stream.empty();
return nullableCollection.stream();
StreamofType(Stream stream, Class type)
Keep only those elements in a stream that are of a given type. 
return stream.filter(type::isInstance).map(t -> (U) t);
Streamopt2stream(Optional opt)
Turns an Optional into a Stream of length zero or one depending upon whether a value is present. 
return opt.map(Stream::of).orElseGet(Stream::empty);
StreamoptionalToStream(final Optional optional)
optional To Stream 
if (optional.isPresent())
    return Stream.of(optional.get());
return Stream.of();
StreamoptionalToStream(Optional optional)
optional To Stream 
return optional.map(Stream::of).orElseGet(Stream::empty);