// Declare and Initialize the Collection



Set<Integer> intSet = new HashSet<Integer>();



// Add Elements



intSet.add(1);

intSet.add(2);

intSet.add(3);

intSet.add(4);



// Set the predicate or the condition for filtering the elements.



Predicate<Integer> moreThan2Pred = (p) -> (p > 1); 



// Use Filter to refine the element set, sort to Sort and Collectors.toSet to get a set out of Stream.



intSet =  intSet.stream().filter(moreThan2Pred).sorted().collect(Collectors.toSet());

    

System.out.println(intSet); // Prints [2, 3, 4]

// Populate a List using Set elements.



// Declare and Initialize the Collection



Set<Integer> intSet = new HashSet<Integer>();

Set<Integer> intSet2 = new HashSet<Integer>(); 



// Add Elements



intSet.add(1);

intSet.add(2);

intSet.add(3);

intSet.add(4);

intSet2.add(1);

intSet2.add(2);

intSet2.add(3);

intSet2.add(4); 



// Use the stream and collectors to Summarize all Integer elements 



IntSummaryStatistics summary = intSet.stream().collect(Collectors.summarizingInt(p->((Integer)p)));

 

summary.combine(intSet2.stream().collect(Collectors.summarizingInt(p->((Integer)p))));

 

System.out.println(summary); // Prints IntSummaryStatistics{count=8, sum=20, min=1, average=2.500000, max=4}

  public void streamingTest() {

    List<BinarySample> trainingBatch = Arrays.asList(

      new BinarySample(true, 1.0),

      new BinarySample(false, 2.0));

    JavaDStream<BinarySample> training =

      attachTestInputStream(ssc, Arrays.asList(trainingBatch, trainingBatch), 2);

    int numBatches = 2;

    StreamingTest model = new StreamingTest()

      .setWindowSize(0)

      .setPeacePeriod(0)

      .setTestMethod("welch");

    model.registerStream(training);

    attachTestOutputStream(training);

    runStreams(ssc, numBatches, numBatches);

  }

  public void handleSuccessfulFetch() throws Exception {

    StreamChunkId streamChunkId = new StreamChunkId(1, 0);



    TransportResponseHandler handler = new TransportResponseHandler(new LocalChannel());

    ChunkReceivedCallback callback = mock(ChunkReceivedCallback.class);

    handler.addFetchRequest(streamChunkId, callback);

    assertEquals(1, handler.numOutstandingRequests());



    handler.handle(new ChunkFetchSuccess(streamChunkId, new TestManagedBuffer(123)));

    verify(callback, times(1)).onSuccess(eq(0), (ManagedBuffer) any());

    assertEquals(0, handler.numOutstandingRequests());

  }

    public static StormTopology buildTopology(WindowsStoreFactory windowStore, WindowConfig windowConfig) throws Exception {

        FixedBatchSpout spout = new FixedBatchSpout(new Fields("sentence"), 3, new Values("the cow jumped over the moon"),

                new Values("the man went to the store and bought some candy"), new Values("four score and seven years ago"),

                new Values("how many apples can you eat"), new Values("to be or not to be the person"));

        spout.setCycle(true);



        TridentTopology topology = new TridentTopology();



        Stream stream = topology.newStream("spout1", spout).parallelismHint(16).each(new Fields("sentence"),

                new Split(), new Fields("word"))

                .window(windowConfig, windowStore, new Fields("word"), new CountAsAggregator(), new Fields("count"))

                .peek(new Consumer() {

                    @Override

                    public void accept(TridentTuple input) {

                        LOG.info("Received tuple: [{}]", input);

                    }

                });



        return topology.build();

    }

List<Integer> list1 = Arrays.asList(1, 2);

List<Integer> list2 = Arrays.asList(4, 5);



Stream.of(list1, list1)

  .flatMap(list -> list.stream())

  .forEach(System.out::println);