summarizing

summarizingDouble()

summarizingDouble(ToDoubleFunction<? super T> mapper)

Example

    public void summarizingDouble() {
        List<Double> doubleList = Arrays.asList(0.002, 23.43, 23.32, 8.76567);
        System.out.println("Contents of the list - " + doubleList);
        Stream<Double> doubleStream = doubleList.stream();
        DoubleSummaryStatistics doubleSummaryStatistics = doubleStream.collect(Collectors.summarizingDouble(e -> e));
        System.out.println("Summary statistics of the stream - " + doubleSummaryStatistics);
    }

Output

Contents of the list - [0.002, 23.43, 23.32, 8.76567]
Summary statistics of the stream - DoubleSummaryStatistics{count=4, sum=55.517670, min=0.002000, average=13.879417, max=23.430000}

summarizingInt()

summarizingInt(ToIntFunction<? super T> mapper)

Example

    public void summarizingInt() {
        List<Integer> integerList = Arrays.asList(23, 23, 8);
        System.out.println("Contents of the list - " + integerList);
        Stream<Integer> integerStream = integerList.stream();
        IntSummaryStatistics intSummaryStatistics = integerStream.collect(Collectors.summarizingInt(e -> e));
        System.out.println("Summary statistics of the stream - " + intSummaryStatistics);
    }

Output

Contents of the list - [23, 23, 8]
Summary statistics of the stream - IntSummaryStatistics{count=3, sum=54, min=8, average=18.000000, max=23}

summarizingLong()

Example

    public void summarizingLong() {
        List<Long> longList = Arrays.asList(2343L, 2332L, 876567L);
        System.out.println("Contents of the list - " + longList);
        Stream<Long> longStream = longList.stream();
        LongSummaryStatistics longSummaryStatistics = longStream.collect(Collectors.summarizingLong(e -> e));
        System.out.println("Summary statistics of the stream - " + longSummaryStatistics);
    }

Output

Contents of the list - [2343, 2332, 876567]
Summary statistics of the stream - LongSummaryStatistics{count=3, sum=881242, min=2332, average=293747.333333, max=876567}