In general, statistics are a processed result of the data. The result could be a number, it may be a count, sum, average, min, max etc. In this blog, I give you the sample program for getting the min, max and average using java 8 Summary Statistics.
Summary Statistics Classes
Java 8 provide various class based on data types for get the statistics those are below
- IntSummaryStatistics
- LongSummaryStatistics
- DoubleSummaryStatistics
package com.samplecoder.streams;
import java.util.Arrays;
import java.util.DoubleSummaryStatistics;
import java.util.IntSummaryStatistics;
import java.util.List;
import java.util.LongSummaryStatistics;
import java.util.stream.Collectors;
public class SummaryStatistics {
public static void main(String[] args) {
// TODO Auto-generated method stub
List<Integer> intNumbers = Arrays.asList(100,3,200,2,1,23,43,545,232);
IntSummaryStatistics intStatistics = intNumbers.stream().collect(Collectors.summarizingInt(item -> item));
System.out.println("Int Summary \n"+intStatistics);
LongSummaryStatistics longStatistics = intNumbers.stream().collect(Collectors.summarizingLong(item -> item));
System.out.println("Long Summary \n"+longStatistics);
List<Number> doubleNumbers = Arrays.asList(100.10,3.2,200.11,2.2,1,2.3,43,545,232);
DoubleSummaryStatistics doubleStatistics = doubleNumbers.stream().collect(Collectors.summarizingDouble(item -> item.doubleValue()));
System.out.println("Double Summary \n"+doubleStatistics);
}
}
Result
Int Summary
IntSummaryStatistics{count=9, sum=1149, min=1, average=127.666667, max=545}
Long Summary
LongSummaryStatistics{count=9, sum=1149, min=1, average=127.666667, max=545}
Double Summary
DoubleSummaryStatistics{count=9, sum=1128.910000, min=1.000000, average=125.434444, max=545.000000}
Conclusion
Now you should know what is a statistic, and what are all the summary statistics classes are available in java 8. And how can we using it. And by that, what are all the possible values you can get.
