LongSummaryStatistics (net.sourceforge.streamsupport:streamsupport 1.5 API)

java.lang.Object
- java8.util.LongSummaryStatistics

All Implemented Interfaces:

IntConsumer, LongConsumer
```
public class LongSummaryStatistics
extends Object
implements LongConsumer, IntConsumer
```
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.
Implementation Note:
This implementation is not thread safe. However, it is safe to use Collectors.summarizingLong() 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.
This implementation does not check for overflow of the sum.
Since:

1.8

Constructor Summary

Constructors
Constructor and Description

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

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

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`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.
`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.
`String`	`toString()` Returns a non-empty string representation of this object suitable for debugging.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - LongSummaryStatistics
```
public LongSummaryStatistics()
```
    Construct an empty instance with zero count, zero sum, Long.MAX_VALUE min, Long.MIN_VALUE max and zero average.
- Method Detail
  - accept
```
public void accept(int value)
```
    Records a new int value into the summary information.
    
    Specified by:
    
    accept in interface IntConsumer
    
    Parameters:
    
    value - the input value
  - accept
```
public void accept(long value)
```
    Records a new long value into the summary information.
    
    Specified by:
    
    accept in interface LongConsumer
    
    Parameters:
    
    value - the input value
  - combine
```
public void combine(LongSummaryStatistics other)
```
    Combines the state of another LongSummaryStatistics into this one.
    
    Parameters:
    
    other - another LongSummaryStatistics
    
    Throws:
    
    NullPointerException - if other is null
  - getCount
```
public final long getCount()
```
    Returns the count of values recorded.
    
    Returns:
    
    the count of values
  - getSum
```
public final long getSum()
```
    Returns the sum of values recorded, or zero if no values have been recorded.
    
    Returns:
    
    the sum of values, or zero if none
  - getMin
```
public final long getMin()
```
    Returns the minimum value recorded, or Long.MAX_VALUE if no values have been recorded.
    
    Returns:
    
    the minimum value, or Long.MAX_VALUE if none
  - getMax
```
public final long getMax()
```
    Returns the maximum value recorded, or Long.MIN_VALUE if no values have been recorded
    
    Returns:
    
    the maximum value, or Long.MIN_VALUE if none
  - getAverage
```
public final double getAverage()
```
    Returns the arithmetic mean of values recorded, or zero if no values have been recorded.
    
    Returns:
    
    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.
    
    Overrides:
    
    toString in class Object
    
    Returns:
    
    a string representation of this object

Class LongSummaryStatistics

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

LongSummaryStatistics

Method Detail

accept

accept

combine

getCount

getSum

getMin

getMax

getAverage

toString