com.jn.langx.util

类 DoubleStatistics

java.lang.Object

com.jn.langx.util.DoubleStatistics

所有已实现的接口:

Consumer<Double>

public class DoubleStatistics
extends Object
implements Consumer<Double>

构造器概要

构造器

构造器和说明
DoubleStatistics() Construct an empty instance with zero count, zero sum, Double.POSITIVE_INFINITY min, Double.NEGATIVE_INFINITY max and zero average.

方法概要

限定符和类型	方法和说明
void	accept(Double value) Records another value into the summary information.
void	combine(DoubleStatistics other) Combines the state of another DoubleStatistics into 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.NaN if any recorded value was NaN or Double.NEGATIVE_INFINITY if no values were recorded.
double	getMin() Returns the minimum recorded value, Double.NaN if any recorded value was NaN or Double.POSITIVE_INFINITY if no values were recorded.
double	getSum() Returns the sum of values recorded, or zero if no values have been recorded.
String	toString() Returns a non-empty string representation of this object suitable for debugging.

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

构造器详细资料

DoubleStatistics

public DoubleStatistics()

Construct an empty instance with zero count, zero sum, Double.POSITIVE_INFINITY min, Double.NEGATIVE_INFINITY max and zero average.

方法详细资料

accept

public void accept(Double value)

Records another value into the summary information.

指定者:

accept 在接口中 Consumer<Double>

参数:

value - the input value

combine

public void combine(DoubleStatistics other)

Combines the state of another DoubleStatistics into this one.

参数:

other - another DoubleStatistics

抛出:

NullPointerException - if other is null

getCount

public final long getCount()

Return the count of values recorded.

返回:

the count of values

getSum

public final double getSum()

Returns the sum of values recorded, or zero if no values have been recorded. If any recorded value is a NaN or the sum is at any point a NaN then the sum will be NaN.

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. Note: Values sorted by increasing absolute magnitude tend to yield more accurate results.

返回:

the sum of values, or zero if none

getMin

public final double getMin()

Returns the minimum recorded value, 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.

返回:

the minimum recorded value, Double.NaN if any recorded value was NaN or Double.POSITIVE_INFINITY if no values were recorded

getMax

public final double getMax()

Returns the maximum recorded value, 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.

返回:

the maximum recorded value, Double.NaN if any recorded value was NaN or Double.NEGATIVE_INFINITY if no values were recorded

getAverage

public final double getAverage()

Returns the arithmetic mean of values recorded, or zero if no values have been recorded. If any recorded value is a NaN or the sum is at any point a NaN then the average will be code NaN.

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. Note: Values sorted by increasing absolute magnitude tend to yield more accurate results.

返回:

the arithmetic mean of values, or zero if none

toString

public String toString()

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.

覆盖:

toString 在类中 Object