1 package api;
2
3 public class Contravariance {
4 private Contravariance() {
5 }
6
7 // BEGIN: variance.contravariance.v2
8 public static boolean isPositive(Number aNumber) {
9 return aNumber.doubleValue() > 0.0d;
10 }
11 // END: variance.contravariance.v2
12 }