java.util.stream.Collectors.summarizingDouble()方法的使用及代码示例

x33g5p2x  于2022-01-17 转载在 其他  
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本文整理了Java中java.util.stream.Collectors.summarizingDouble()方法的一些代码示例，展示了Collectors.summarizingDouble()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Collectors.summarizingDouble()方法的具体详情如下：
包路径：java.util.stream.Collectors
类名称：Collectors
方法名：summarizingDouble

Collectors.summarizingDouble介绍

暂无

代码示例

代码示例来源：origin: goldmansachs/gs-collections

  1. @Benchmark
  2. public Map<Product, DoubleSummaryStatistics> aggregateByProduct_serial_lazy_jdk()
  3. {
  4.   Map<Product, DoubleSummaryStatistics> result =
  5.       this.jdkPositions.stream().collect(
  6.           Collectors.groupingBy(
  7.               Position::getProduct,
  8.               Collectors.summarizingDouble(Position::getMarketValue)));
  9.   Assert.assertNotNull(result);
  10.   return result;
  11. }

代码示例来源：origin: goldmansachs/gs-collections

  1. @Benchmark
  2. public Map<Account, DoubleSummaryStatistics> aggregateByAccount_serial_lazy_jdk()
  3. {
  4.   Map<Account, DoubleSummaryStatistics> accountDoubleMap =
  5.       this.jdkPositions.stream().collect(
  6.           Collectors.groupingBy(
  7.               Position::getAccount,
  8.               Collectors.summarizingDouble(Position::getMarketValue)));
  9.   Assert.assertNotNull(accountDoubleMap);
  10.   return accountDoubleMap;
  11. }

代码示例来源：origin: goldmansachs/gs-collections

  1. @Benchmark
  2. public Map<String, DoubleSummaryStatistics> aggregateByCategory_serial_lazy_jdk()
  3. {
  4.   Map<String, DoubleSummaryStatistics> categoryDoubleMap =
  5.       this.jdkPositions.stream().collect(
  6.           Collectors.groupingBy(
  7.               Position::getCategory,
  8.               Collectors.summarizingDouble(Position::getMarketValue)));
  9.   Assert.assertNotNull(categoryDoubleMap);
  10.   return categoryDoubleMap;
  11. }

代码示例来源：origin: goldmansachs/gs-collections

  1. @Benchmark
  2. public Map<String, DoubleSummaryStatistics> aggregateByCategory_serial_lazy_streams_gsc()
  3. {
  4.   Map<String, DoubleSummaryStatistics> categoryDoubleMap =
  5.       this.gscPositions.stream().collect(
  6.           Collectors.groupingBy(
  7.               Position::getCategory,
  8.               Collectors.summarizingDouble(Position::getMarketValue)));
  9.   Assert.assertNotNull(categoryDoubleMap);
  10.   return categoryDoubleMap;
  11. }

代码示例来源：origin: goldmansachs/gs-collections

  1. @Benchmark
  2. public Map<Account, DoubleSummaryStatistics> aggregateByAccount_parallel_lazy_jdk()
  3. {
  4.   Map<Account, DoubleSummaryStatistics> result =
  5.       this.jdkPositions.parallelStream().collect(
  6.           Collectors.groupingBy(
  7.               Position::getAccount,
  8.               Collectors.summarizingDouble(Position::getMarketValue)));
  9.   Assert.assertNotNull(result);
  10.   return result;
  11. }

代码示例来源：origin: goldmansachs/gs-collections

  1. @Benchmark
  2. public Map<Account, DoubleSummaryStatistics> aggregateByAccount_parallel_lazy_streams_gsc()
  3. {
  4.   Map<Account, DoubleSummaryStatistics> result =
  5.       this.gscPositions.parallelStream().collect(
  6.           Collectors.groupingBy(
  7.               Position::getAccount,
  8.               Collectors.summarizingDouble(Position::getMarketValue)));
  9.   Assert.assertNotNull(result);
  10.   return result;
  11. }

代码示例来源：origin: goldmansachs/gs-collections

  1. @Benchmark
  2. public Map<String, DoubleSummaryStatistics> aggregateByCategory_parallel_lazy_streams_gsc()
  3. {
  4.   Map<String, DoubleSummaryStatistics> result =
  5.       this.gscPositions.parallelStream().collect(
  6.           Collectors.groupingBy(Position::getCategory, Collectors.summarizingDouble(Position::getMarketValue)));
  7.   Assert.assertNotNull(result);
  8.   return result;
  9. }

代码示例来源：origin: goldmansachs/gs-collections

  1. @Benchmark
  2. public Map<Account, DoubleSummaryStatistics> aggregateByAccount_serial_lazy_streams_gsc()
  3. {
  4.   Map<Account, DoubleSummaryStatistics> accountDoubleMap =
  5.       this.gscPositions.stream().collect(
  6.           Collectors.groupingBy(
  7.               Position::getAccount,
  8.               Collectors.summarizingDouble(Position::getMarketValue)));
  9.   Assert.assertNotNull(accountDoubleMap);
  10.   return accountDoubleMap;
  11. }

代码示例来源：origin: goldmansachs/gs-collections

  1. @Benchmark
  2. public Map<Product, DoubleSummaryStatistics> aggregateByProduct_parallel_lazy_jdk()
  3. {
  4.   Map<Product, DoubleSummaryStatistics> result =
  5.       this.jdkPositions.parallelStream().collect(
  6.           Collectors.groupingBy(
  7.               Position::getProduct,
  8.               Collectors.summarizingDouble(Position::getMarketValue)));
  9.   Assert.assertNotNull(result);
  10.   return result;
  11. }

代码示例来源：origin: goldmansachs/gs-collections

  1. @Benchmark
  2. public Map<Product, DoubleSummaryStatistics> aggregateByProduct_serial_lazy_streams_gsc()
  3. {
  4.   Map<Product, DoubleSummaryStatistics> result =
  5.       this.gscPositions.stream().collect(
  6.           Collectors.groupingBy(
  7.               Position::getProduct,
  8.               Collectors.summarizingDouble(Position::getMarketValue)));
  9.   Assert.assertNotNull(result);
  10.   return result;
  11. }

代码示例来源：origin: goldmansachs/gs-collections

  1. @Benchmark
  2. public Map<Product, DoubleSummaryStatistics> aggregateByProduct_parallel_lazy_streams_gsc()
  3. {
  4.   Map<Product, DoubleSummaryStatistics> result =
  5.       this.gscPositions.parallelStream().collect(
  6.           Collectors.groupingBy(
  7.               Position::getProduct,
  8.               Collectors.summarizingDouble(Position::getMarketValue)));
  9.   Assert.assertNotNull(result);
  10.   return result;
  11. }

代码示例来源：origin: goldmansachs/gs-collections

  1. @Benchmark
  2. public Map<String, DoubleSummaryStatistics> aggregateByCategory_parallel_lazy_jdk()
  3. {
  4.   Map<String, DoubleSummaryStatistics> result =
  5.       this.jdkPositions.parallelStream().collect(
  6.           Collectors.groupingBy(Position::getCategory, Collectors.summarizingDouble(Position::getMarketValue)));
  7.   Assert.assertNotNull(result);
  8.   return result;
  9. }

代码示例来源：origin: OryxProject/oryx

  1. .collect(Collectors.summarizingDouble(f -> ((NumericFeature) f).getValue()))
  2. ).collect().stream().map(p -> {

代码示例来源：origin: aol/cyclops

  1. default DoubleSummaryStatistics doubleStats(ToDoubleFunction<T> fn){
  2.   return stream().collect(Collectors.summarizingDouble(fn));
  3. }

代码示例来源：origin: geotools/geotools

  1. /** Returns min and max value applying the expression over the feature collection */
  2. public static NumberRange<Double> getMinMax(
  3.     ListFeatureCollection fc, Expression attributeExpression) {
  4.   DoubleSummaryStatistics stats =
  5.       fc.stream()
  6.           .collect(
  7.               Collectors.summarizingDouble(
  8.                   f -> attributeExpression.evaluate(f, Double.class)));
  9.   return new NumberRange<>(Double.class, stats.getMin(), stats.getMax());
  10. }

代码示例来源：origin: sing-group/GC4S

  1. protected String getDoubleListSummary(List<Double> values,
  2.   String numericType
  3. ) {
  4.   DoubleSummaryStatistics statistics = values.stream()
  5.     .collect(Collectors.summarizingDouble(Double::doubleValue));
  7.   return getSummary(numericType, new SummaryStatistics(statistics));
  8. }

代码示例来源：origin: kousen/java_8_recipes

  1. public void computeSalaryStatistics() {
  2.   List<Team> teams = parseSalaries();
  3.   DoubleSummaryStatistics teamStats = teams.stream()
  4.       .mapToDouble(Team::getSalary)
  5.       .collect(DoubleSummaryStatistics::new,
  6.           DoubleSummaryStatistics::accept,
  7.           DoubleSummaryStatistics::combine);
  8.   printStats(teamStats);
  9.   teamStats = teams.stream()
  10.       .collect(Collectors.summarizingDouble(Team::getSalary));
  11.   printStats(teamStats);
  12. }

代码示例来源：origin: com.oath.cyclops/cyclops

  1. default DoubleSummaryStatistics doubleStats(ToDoubleFunction<T> fn){
  2.   return stream().collect(Collectors.summarizingDouble(fn));
  3. }

代码示例来源：origin: Netflix/spectator

  1. @Test
  2. public void maxGauge() {
  3.  Registry r = newRegistry(true, 10000);
  4.  r.maxGauge("foo").set(1.0);
  5.  r.maxGauge("foo").set(3.0);
  6.  r.maxGauge("foo").set(2.0);
  7.  final DoubleSummaryStatistics valueSummary = r.gauges()
  8.    .filter(Functions.nameEquals("foo"))
  9.    .collect(Collectors.summarizingDouble(Gauge::value));
  10.  Assertions.assertEquals(1, valueSummary.getCount());
  11.  Assertions.assertEquals(3.0, valueSummary.getSum(), 1e-12);
  12. }

代码示例来源：origin: Netflix/spectator

  1. @Test
  2. public void gauges() {
  3.  Registry r = newRegistry(true, 10000);
  4.  r.gauge(r.createId("foo", "a", "1")).set(1.0);
  5.  r.gauge(r.createId("foo", "a", "2")).set(2.0);
  6.  r.gauge(r.createId("bar")).set(7.0);
  7.  Assertions.assertEquals(3, r.gauges().count());
  8.  final DoubleSummaryStatistics valueSummary = r.gauges()
  9.    .filter(Functions.nameEquals("foo"))
  10.    .collect(Collectors.summarizingDouble(Gauge::value));
  11.  Assertions.assertEquals(2, valueSummary.getCount());
  12.  Assertions.assertEquals(3.0, valueSummary.getSum(), 1e-12);
  13.  Assertions.assertEquals(1.5, valueSummary.getAverage(), 1e-12);
  14. }

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