apache commons math用法

import org.apache.commons.math.stat.descriptive.rank.Max;
import org.apache.commons.math.stat.descriptive.rank.Min;
import org.apache.commons.math.stat.descriptive.summary.Product;
import org.apache.commons.math.stat.descriptive.summary.Sum;

public class TestMathUserage {
 
 public static void main(String[] args) {
  double[] values = new double[] { 1,2,4};
  Min min = new Min();
  Max max = new Max();
  Product product = new Product();  // 所有相乘
  Sum sum = new Sum();
  System.out.println("min: " + min.evaluate(values));
  System.out.println("max: " + max.evaluate(values));
  System.out.println("product: " + product.evaluate(values));
  System.out.println("sum: " + sum.evaluate(values));
 }
}
输出:
min: 1.0
max: 4.0
product: 8.0
sum: 7.0