Java Utililty Methods Stream of

List of utility methods to do Stream of

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Description

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

Method

StreamtoStream(Iterator iter, boolean parallel)
to Stream 
return StreamSupport.stream(Spliterators.spliteratorUnknownSize(iter, Spliterator.ORDERED), parallel);
StreamtoStream(Optional value)
No longer needed in Java 9 where Optional.stream() is added. 
if (value.isPresent()) {
    return Stream.of(value.get());
} else {
    return Stream.empty();
StreamtoStream(T[] array, boolean parallel)
to Stream 
return StreamSupport.stream(Arrays.spliterator(array), parallel);
StreamtoStreamLine(final Scanner scanner)
to Stream Line 
Objects.requireNonNull(scanner);
final Iterator<String> iter = new Iterator<String>() {
    final Scanner s = scanner;
    @Override
    public boolean hasNext() {
        return s.hasNextLine();
    @Override
...
StreamtoStreamNumber(final Scanner scanner)
to Stream Number 
Objects.requireNonNull(scanner);
final Iterator<Long> iter = new Iterator<Long>() {
    final Scanner s = scanner;
    @Override
    public boolean hasNext() {
        boolean hasNumber = false;
        while (s.hasNext()) {
            hasNumber = s.hasNextLong();
...