What is IntSummaryStatistics in Java?

Overview

For integer values, IntSummaryStatistics is used to collect statistics such as count, min, max, total, and average. This class is intended to operate with streams, although it is not required. It was introduced in Java 8.

IntSummaryStatistics is defined in the util package in Java, so you must import the util package before using the IntSummaryStatistics class, as shown below:

import java.util.IntSummaryStatistics;

Methods

Method name	Description
`accept(int value)`	Another integer value is added to the summary information.
`combine(IntSummaryStatistics other)`	The state of another `IntSummaryStatistics` object is merged using this method.
`getCount()`	Returns the total number of values that have been seen so far.
`getSum()`	Returns the sum of all values observed so far, or zero if none have been seen.
`getMin()`	Returns the smallest recorded integer value.
`getMax()`	Returns the largest recorded integer value.
`getAverage()`	Returns the arithmetic mean of all values seen so far, or zero if none have been seen.

import java.util.ArrayList;
import java.util.IntSummaryStatistics;
import java.util.List;
public class Main {
    public static void main(String args[])
    {
        List<Integer> integerList = new ArrayList<>();
        integerList.add(154);
        integerList.add(65);
        integerList.add(456);
        integerList.add(765);
        integerList.add(23456);
        integerList.add(34565432);
        IntSummaryStatistics intSummaryStatistics = new IntSummaryStatistics();
        for(int d: integerList) intSummaryStatistics.accept(d);
        System.out.println("Count of the elements - " + intSummaryStatistics.getCount());
        System.out.println("Sum of the elements - " + intSummaryStatistics.getSum());
        System.out.println("Minimum element - " + intSummaryStatistics.getMin());
        System.out.println("Maximum element - " + intSummaryStatistics.getMax());
        System.out.println("Average of the elements - " + intSummaryStatistics.getAverage());
    }
}

import java.util.ArrayList;
import java.util.IntSummaryStatistics;
import java.util.stream.Collectors;
import java.util.List;
public class Main {
    public static void main(String args[])
    {
        List<Integer> integerList = new ArrayList<>();
        integerList.add(154);
        integerList.add(65);
        integerList.add(456);
        integerList.add(765);
        integerList.add(23456);
        integerList.add(34565432);
        IntSummaryStatistics intSummaryStatistics = integerList.stream().collect(Collectors.summarizingInt(e -> e));
        System.out.println("Count of the elements - " + intSummaryStatistics.getCount());
        System.out.println("Sum of the elements - " + intSummaryStatistics.getSum());
        System.out.println("Minimum element - " + intSummaryStatistics.getMin());
        System.out.println("Maximum element - " + intSummaryStatistics.getMax());
        System.out.println("Average of the elements - " + intSummaryStatistics.getAverage());
    }
}

What is IntSummaryStatistics in Java?

Overview

Methods

Examples