public class DoubleSummaryStatistics extends Object implements DoubleConsumer
This class is designed to work with (though does not require) streams. For example, you can compute summary statistics on a stream of doubles with:
 
 DoubleSummaryStatistics stats = doubleStream.collect(DoubleSummaryStatistics::new,
                                                      DoubleSummaryStatistics::accept,
                                                      DoubleSummaryStatistics::combine);
 
 DoubleSummaryStatistics can be used as a
 reduction
 target for a stream. For example:
 
 
 DoubleSummaryStatistics stats = people.stream()
     .collect(Collectors.summarizingDouble(Person::getWeight));
 This computes, in a single pass, the count of people, as well as the minimum,
 maximum, sum, and average of their weights.Collectors.toDoubleStatistics() on a parallel stream, because the parallel
 implementation of Stream.collect()
 provides the necessary partitioning, isolation, and merging of results for
 safe and efficient parallel execution.| Constructor and Description | 
|---|
| DoubleSummaryStatistics()Construct an empty instance with zero count, zero sum,
  Double.POSITIVE_INFINITYmin,Double.NEGATIVE_INFINITYmax and zero average. | 
| Modifier and Type | Method and Description | 
|---|---|
| void | accept(double value)Records another value into the summary information. | 
| void | combine(DoubleSummaryStatistics other)Combines the state of another  DoubleSummaryStatisticsinto this
 one. | 
| double | getAverage()Returns the arithmetic mean of values recorded, or zero if no
 values have been recorded. | 
| long | getCount()Return the count of values recorded. | 
| double | getMax()Returns the maximum recorded value,  Double.NaNif any recorded
 value was NaN orDouble.NEGATIVE_INFINITYif no values were
 recorded. | 
| double | getMin()Returns the minimum recorded value,  Double.NaNif any recorded
 value was NaN orDouble.POSITIVE_INFINITYif no values were
 recorded. | 
| double | getSum()Returns the sum of values recorded, or zero if no values have been
 recorded. | 
| String | toString()Returns a string representation of the object. | 
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, waitandThenpublic DoubleSummaryStatistics()
Double.POSITIVE_INFINITY min, Double.NEGATIVE_INFINITY
 max and zero average.public void accept(double value)
accept in interface DoubleConsumervalue - the input valuepublic void combine(DoubleSummaryStatistics other)
DoubleSummaryStatistics into this
 one.other - another DoubleSummaryStatisticsNullPointerException - if other is nullpublic final long getCount()
public final double getSum()
 The value of a floating-point sum is a function both of the
 input values as well as the order of addition operations. The
 order of addition operations of this method is intentionally
 not defined to allow for implementation flexibility to improve
 the speed and accuracy of the computed result.
 In particular, this method may be implemented using compensated
 summation or other technique to reduce the error bound in the
 numerical sum compared to a simple summation of double
 values.
public final double getMin()
Double.NaN if any recorded
 value was NaN or Double.POSITIVE_INFINITY if no values were
 recorded. Unlike the numerical comparison operators, this method
 considers negative zero to be strictly smaller than positive zero.Double.NaN if any recorded
 value was NaN or Double.POSITIVE_INFINITY if no values were
 recordedpublic final double getMax()
Double.NaN if any recorded
 value was NaN or Double.NEGATIVE_INFINITY if no values were
 recorded. Unlike the numerical comparison operators, this method
 considers negative zero to be strictly smaller than positive zero.Double.NaN if any recorded
 value was NaN or Double.NEGATIVE_INFINITY if no values were
 recordedpublic final double getAverage()
The average returned can vary depending upon the order in
 which values are recorded.
 This method may be implemented using compensated summation or
 other technique to reduce the error bound in the numerical sum used to compute the average.
public String toString()
toString method returns a string that
 "textually represents" this object. The result should
 be a concise but informative representation that is easy for a
 person to read.
 It is recommended that all subclasses override this method.
 
 The toString method for class Object
 returns a string consisting of the name of the class of which the
 object is an instance, the at-sign character `@', and
 the unsigned hexadecimal representation of the hash code of the
 object. In other words, this method returns a string equal to the
 value of:
 
Returns a non-empty string representation of this object suitable for debugging. The exact presentation format is unspecified and may vary between implementations and versions.getClass().getName() + '@' + Integer.toHexString(hashCode())
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