| Package | Description | 
|---|---|
| java.util | Contains the collections framework, legacy collection classes, event model,
date and time facilities, internationalization, and miscellaneous utility
classes (a string tokenizer, a random-number generator, and a bit array). | 
| java.util.stream | Classes to support functional-style operations on streams of elements, such
 as map-reduce transformations on collections. | 
| Modifier and Type | Method and Description | 
|---|---|
| void | DoubleSummaryStatistics. combine(DoubleSummaryStatistics other)Combines the state of another  DoubleSummaryStatisticsinto this
 one. | 
| Modifier and Type | Method and Description | 
|---|---|
| DoubleSummaryStatistics | DoubleStream. summaryStatistics()Returns a  DoubleSummaryStatisticsdescribing various summary data
 about the elements of this stream. | 
| Modifier and Type | Method and Description | 
|---|---|
| static <T> Collector<T,?,DoubleSummaryStatistics> | Collectors. summarizingDouble(ToDoubleFunction<? super T> mapper)Returns a  Collectorwhich applies andouble-producing
 mapping function to each input element, and returns summary statistics
 for the resulting values. | 
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