jtulach@8: package api;
jtulach@8: 
jtulach@379: public class Contravariance {
jtulach@379:     private Contravariance() {
jtulach@8:     }
jtulach@8: 
jtulach@379:     // BEGIN: variance.contravariance.v1
jtulach@389:     public static boolean isPositive(Integer aNumber) {
jtulach@389:         return aNumber > 0;
jtulach@378:     }
jtulach@379:     // END: variance.contravariance.v1
jtulach@8: }