Java . util . intsummarystatistics 类，带示例
原文:https://www . geesforgeks . org/Java-util-intsummarystatics-class-with-examples/
IntSummaryStatistics 类存在于 java.util 包 中。它收集了整数对象，在我们处理整数流的情况下非常有用。它维护它已经处理的整数的计数、它们的总和以及各种其他统计数据。该类也可以与 Streams 一起使用。
它是有用的，因为它保持一个连续的总和、平均值等。因此可以用于统计数据的处理。
等级体系
java.lang.Object
↳ java.util.IntSummaryStatistics
施工人员
-
IntSummaryStatistics(): A default constructor which initializes the count and sum to zero, and sets max to Integer.MIN_VALUE and min to Integer.MAX_VALUE.
语法:
```java public IntSummaryStatistics()
```
-
IntSummaryStatistics(count, min, max, sum): Initializes the various data members with the parameters passed during invocation.
语法:
```java public IntSummaryStatistics(long count, int min, int max, long sum) throws IllegalArgumentException
```
方法:
-
accept() – This function adds the passed integer into the statistical data.
语法:
```java public void accept(int value)
```
-
combine() :此功能将传递的 IntSummaryStatistics 对象的统计数据与当前统计数据进行合并。
语法:
public void combine(IntSummaryStatistics other)
-
getCount(): This method returns the count of the number of integers processed.
语法:
```java public final long getCount()
```
-
getSum(): This method returns the sum of all the integers processed.
语法:
```java public final long getSum()
```
-
getAverage(): This method returns the average of all the integers processed.
语法:
```java public final double getAverage()
```
-
getMin(): This method returns the minimum integer of all the integers processed.
语法:
```java public final int getMin()
```
-
getMax(): This method returns the maximum integer of all the integers processed.
语法:
```java public final int getMax()
```
-
toString(): This method returns the string representation of all the statistical data contained in the object.
语法:
```java public String toString()
```
示例演示 IntSummaryStatistics 的实际应用。
```java // Java program to demonstrate // IntSummaryStatistics class
import java.util.*;
public class IntSummaryStatisticsDemo { public static void main(String[] args) {
IntSummaryStatistics intSummaryStatistics = new IntSummaryStatistics();
List list = Arrays.asList(10, 20, 30, 40, 50);
Iterator iterator = list.listIterator(); while (iterator.hasNext()) { // Add the integers to the IntSummaryStatistics object intSummaryStatistics.accept(iterator.next()); }
// Use various methods to obtain the data System.out.println("The count of values is " + intSummaryStatistics.getCount()); System.out.println("The average of values is " + intSummaryStatistics.getAverage()); System.out.println("The sum of values is " + intSummaryStatistics.getSum()); System.out.println("The maximum of values is " + intSummaryStatistics.getMax()); System.out.println("The minimum of values is " + intSummaryStatistics.getMin()); System.out.println("The string representation is"); System.out.println(intSummaryStatistics.toString()); } } ```
Output:
```java The count of values is 5 The average of values is 30.0 The sum of values is 150 The maximum of values is 50 The minimum of values is 10 The string representation is IntSummaryStatistics{count=5, sum=150, min=10, average=30.000000, max=50}
```
参考:https://docs . Oracle . com/javase/10/docs/API/Java/util/intsummarystatistics . html
版权属于：月萌API www.moonapi.com，转载请注明出处
