Added in API level 24

LongSummaryStatistics

open class LongSummaryStatistics : LongConsumer, IntConsumer

kotlin.Any
↳	java.util.LongSummaryStatistics

A state object for collecting statistics such as count, min, max, sum, and average.

This class is designed to work with (though does not require) streams. For example, you can compute summary statistics on a stream of longs with:

<code>LongSummaryStatistics stats = longStream.collect(LongSummaryStatistics::new,
                                                   LongSummaryStatistics::accept,
                                                   LongSummaryStatistics::combine);
  </code>

LongSummaryStatistics can be used as a reduction target for a stream. For example:

<code>LongSummaryStatistics stats = people.stream()
                                      .collect(Collectors.summarizingLong(Person::getAge));
 </code>

This computes, in a single pass, the count of people, as well as the minimum, maximum, sum, and average of their ages.

Summary

Public constructors
`LongSummaryStatistics()` Constructs an empty instance with zero count, zero sum, `Long.MAX_VALUE` min, `Long.MIN_VALUE` max and zero average.
`LongSummaryStatistics(count: Long, min: Long, max: Long, sum: Long)` Constructs a non-empty instance with the specified `count`, `min`, `max`, and `sum`.

Public methods
open Unit	`accept(value: Int)` Records a new `int` value into the summary information.
open Unit	`accept(value: Long)` Records a new `long` value into the summary information.
open Unit	`combine(other: LongSummaryStatistics!)` Combines the state of another `LongSummaryStatistics` into this one.
Double	`getAverage()` Returns the arithmetic mean of values recorded, or zero if no values have been recorded.
Long	`getCount()` Returns the count of values recorded.
Long	`getMax()` Returns the maximum value recorded, or `Long.MIN_VALUE` if no values have been recorded
Long	`getMin()` Returns the minimum value recorded, or `Long.MAX_VALUE` if no values have been recorded.
Long	`getSum()` Returns the sum of values recorded, or zero if no values have been recorded.
open String	`toString()` Returns a non-empty string representation of this object suitable for debugging.

Inherited functions

From class LongConsumer

LongConsumer!

andThen(after: LongConsumer!)

Returns a composed LongConsumer that performs, in sequence, this operation followed by the after operation. If performing either operation throws an exception, it is relayed to the caller of the composed operation. If performing this operation throws an exception, the after operation will not be performed.

From class IntConsumer

IntConsumer!

andThen(after: IntConsumer!)

Returns a composed IntConsumer that performs, in sequence, this operation followed by the after operation. If performing either operation throws an exception, it is relayed to the caller of the composed operation. If performing this operation throws an exception, the after operation will not be performed.

Public constructors

LongSummaryStatistics

Added in API level 24

LongSummaryStatistics()

Constructs an empty instance with zero count, zero sum, Long.MAX_VALUE min, Long.MIN_VALUE max and zero average.

LongSummaryStatistics

Added in API level 33

LongSummaryStatistics(
    count: Long, 
    min: Long, 
    max: Long, 
    sum: Long)

Constructs a non-empty instance with the specified count, min, max, and sum.

If count is zero then the remaining arguments are ignored and an empty instance is constructed.

If the arguments are inconsistent then an IllegalArgumentException is thrown. The necessary consistent argument conditions are:

count >= 0
min <= max

Parameters
`count`	Long: the count of values
`min`	Long: the minimum value
`max`	Long: the maximum value
`sum`	Long: the sum of all values

Exceptions
`java.lang.IllegalArgumentException`	if the arguments are inconsistent

Public methods

accept

Added in API level 24

open fun accept(value: Int): Unit

Records a new int value into the summary information.

Parameters
`value`	Int: the input value

accept

Added in API level 24

open fun accept(value: Long): Unit

Records a new long value into the summary information.

Parameters
`value`	Long: the input value

combine

Added in API level 24

open fun combine(other: LongSummaryStatistics!): Unit

Combines the state of another LongSummaryStatistics into this one.

Parameters
`other`	LongSummaryStatistics!: another `LongSummaryStatistics`

Exceptions
`java.lang.NullPointerException`	if `other` is null

getAverage

Added in API level 24

fun getAverage(): Double

Returns the arithmetic mean of values recorded, or zero if no values have been recorded.

Return
`Double`	The arithmetic mean of values, or zero if none

getCount

Added in API level 24

fun getCount(): Long

Returns the count of values recorded.

Return
`Long`	the count of values

getMax

Added in API level 24

fun getMax(): Long

Returns the maximum value recorded, or Long.MIN_VALUE if no values have been recorded

Return
`Long`	the maximum value, or `Long.MIN_VALUE` if none

getMin

Added in API level 24

fun getMin(): Long

Returns the minimum value recorded, or Long.MAX_VALUE if no values have been recorded.

Return
`Long`	the minimum value, or `Long.MAX_VALUE` if none

getSum

Added in API level 24

fun getSum(): Long

Returns the sum of values recorded, or zero if no values have been recorded.

Return
`Long`	the sum of values, or zero if none

toString

Added in API level 24

open fun toString(): String

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.

Return
`String`	a string representation of the object.