Java Utililty Methods Stream Operation

List of utility methods to do Stream Operation

  1. HOME
  2. Java
  3. S
  4. Stream Operation

Description

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

Method

booleanisEmpty(final Stream stream)
Checks whether the given stream is empty. 
return stream.count() <= 0;
booleanisFinite(Stream stream)
is Finite 
throw new UnsupportedOperationException("Cannot be implemented");
IterableiterableOf(Stream stream)
convert stream to iterable 
return stream::iterator;
StreamiteratorToFiniteStream(Iterator iterator, boolean parallel)
iterator To Finite Stream 
final Iterable<T> iterable = () -> iterator;
return StreamSupport.stream(iterable.spliterator(), parallel);
StreamiteratorToStream(final Iterator iterator)
Convert an Iterator to a Stream 
return iteratorToStream(iterator, false);
Stream>lazyPartition(final Stream stream, final int maxPartitionSize)
lazy Partition 
final Iterator<T> iterator = stream.iterator();
final Iterable<Stream<T>> partitionedIterable = () -> new Iterator<Stream<T>>() {
    public boolean hasNext() {
        return iterator.hasNext();
    public Stream<T> next() {
        List<T> partition = new ArrayList<>();
        while (partition.size() < maxPartitionSize && iterator.hasNext()) {
...
LongStreamlazyStream(PrimitiveIterator.OfLong iterator)
Utility Method to create a stream from an iterator. 
return longStream(spliteratorUnknownSize(iterator, IMMUTABLE | NONNULL), false);
long[]longArray(Stream stream)
Returns an array view of a Stream of Long 
return stream.mapToLong(Long::valueOf).toArray();
ListlongList(LongStream stream)
Returns a List view of a LongStream 
return stream.mapToObj(Long::valueOf).collect(toList());
StreammakeStream(final Object[] array)
make Stream 
return Arrays.stream(array).map(Object::toString);