Summary Statistics
Description
The java.util package contains three classes to collect statistics:
- DoubleSummaryStatistics
- LongSummaryStatistics
- IntSummaryStatistics
We can use them to compute the summary statistics on any group of numeric data.
Example
The following code shows how to compute the statistics on a number of double values.
import java.time.LocalDate;
import java.time.Month;
import java.util.Arrays;
import java.util.DoubleSummaryStatistics;
import java.util.List;
/*from w w w.j av a 2s . c o m*/
public class Main {
public static void main(String[] args) {
DoubleSummaryStatistics stats = new DoubleSummaryStatistics();
stats.accept(100.0);
stats.accept(300.0);
stats.accept(230.0);
stats.accept(532.0);
stats.accept(422.0);
long count = stats.getCount();
double sum = stats.getSum();
double min = stats.getMin();
double avg = stats.getAverage();
double max = stats.getMax();
System.out.printf(
"count=%d, sum=%.2f, min=%.2f, average=%.2f, max=%.2f%n", count, sum,
min, max, avg);
}
}
The code above generates the following result.
