5. Java 8 { λ }. Impression
12 Years Without Lambdas ...
6. java.util.stream.Stream<T>
A sequence of elements supporting sequential
and parallel bulk operations
public interface Stream<T> extends BaseStream<T,
Stream<T>>
public interface BaseStream<T, S extends BaseStream<T,
S>> extends AutoCloseable
24. Parallel Streams. Non-interference
seq: terminal op starts -> do not update
source -> terminal op ends.
List<String> l = new ArrayList<String>(Arrays.asList("kaunas-jug", "meeting"));
Stream<String> sl = l.parallelStream();
l.add("#3");
String s = sl.collect(Collectors.joining(" "));
System.out.println(s);
NonInterference.java
26. Parallel Streams. reduce. Associativity
(a op b) op c == a op (b op c)
a op b op c op d == (a op b) op (c op d)
IntStream stream = IntStream.rangeClosed(1, 4).
parallel();
OptionalInt rez = stream.reduce((x, y) -> x - y)
ReduceAssociativity.java