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LongSummaryStatistics

public class LongSummaryStatistics
extends Object implements LongConsumer, IntConsumer

java.lang.Object
↳	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:

 LongSummaryStatistics stats = longStream.collect(LongSummaryStatistics::new,
                                                  LongSummaryStatistics::accept,
                                                  LongSummaryStatistics::combine);

LongSummaryStatistics can be used as a Stream.collect(Collector) reduction} target for a stream. For example:

 LongSummaryStatistics stats = people.stream()
                                     .collect(Collectors.summarizingLong(Person::getAge));

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()` Construct an empty instance with zero count, zero sum, `Long.MAX_VALUE` min, `Long.MIN_VALUE` max and zero average.

Public methods
`void`	`accept(int value)` Records a new `int` value into the summary information.
`void`	`accept(long value)` Records a new `long` value into the summary information.
`void`	`combine(LongSummaryStatistics other)` Combines the state of another `LongSummaryStatistics` into this one.
`final double`	`getAverage()` Returns the arithmetic mean of values recorded, or zero if no values have been recorded.
`final long`	`getCount()` Returns the count of values recorded.
`final long`	`getMax()` Returns the maximum value recorded, or `Long.MIN_VALUE` if no values have been recorded
`final long`	`getMin()` Returns the minimum value recorded, or `Long.MAX_VALUE` if no values have been recorded.
`final long`	`getSum()` Returns the sum of values recorded, or zero if no values have been recorded.
`String`	`toString()` Returns a string representation of the object.

Inherited methods

From class


        
          java.lang.Object

`Object`	`clone()` Creates and returns a copy of this object.
`boolean`	`equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void`	`finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>`	`getClass()` Returns the runtime class of this `Object`.
`int`	`hashCode()` Returns a hash code value for the object.
`final void`	`notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void`	`notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String`	`toString()` Returns a string representation of the object.
`final void`	`wait(long timeout, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void`	`wait(long timeout)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void`	`wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.

From interface


        
          java.util.function.LongConsumer

`abstract void`	`accept(long value)` Performs this operation on the given argument.
`default LongConsumer`	`andThen(LongConsumer after)` Returns a composed `LongConsumer` that performs, in sequence, this operation followed by the `after` operation.

From interface


        
          java.util.function.IntConsumer

`abstract void`	`accept(int value)` Performs this operation on the given argument.
`default IntConsumer`	`andThen(IntConsumer after)` Returns a composed `IntConsumer` that performs, in sequence, this operation followed by the `after` operation.

Public constructors

LongSummaryStatistics

public LongSummaryStatistics ()

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

Public methods

accept

public void accept (int value)

Records a new int value into the summary information.

Parameters
`value`	`int`: the input value

accept

public void accept (long value)

Records a new long value into the summary information.

Parameters
`value`	`long`: the input value

combine

public void combine (LongSummaryStatistics other)

Combines the state of another LongSummaryStatistics into this one.

Parameters
`other`	`LongSummaryStatistics`: another `LongSummaryStatistics`

Throws
`NullPointerException`	if `other` is null

getAverage

public final double getAverage ()

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

Returns
`double`	The arithmetic mean of values, or zero if none

getCount

public final long getCount ()

Returns the count of values recorded.

Returns
`long`	the count of values

getMax

public final long getMax ()

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

Returns
`long`	the maximum value, or `Long.MIN_VALUE` if none

getMin

public final long getMin ()

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

Returns
`long`	the minimum value, or `Long.MAX_VALUE` if none

getSum

public final long getSum ()

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

Returns
`long`	the sum of values, or zero if none

toString

public String toString ()

Returns a string representation of the object. In general, the 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:

 getClass().getName() + '@' + Integer.toHexString(hashCode())

Returns
`String`	a string representation of the object.

Interfaces

Classes

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Exceptions

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LongSummaryStatistics

Summary

Public constructors

Public methods

Inherited methods

Public constructors

LongSummaryStatistics

Public methods

accept

accept

combine

getAverage

getCount

getMax

getMin

getSum

toString