Medium — java-8-lambdas — Step 6

Main.java

import java.util.Arrays;
import java.util.List;

public class Main {
    public static void main(String[] args) {

        List<Animal> animals = Arrays.asList(new Frog(), new Kangaroo(), new Fish());

        AnimalMatcher hopMatcher = Animal::canHop;
        AnimalMatcher swimMatcher = Animal::canSwim;

        for (Animal animal : animals) {
            if (hopMatcher.matches(animal)) {
                System.out.println(animal.getName() + " can hop!");
            }
            if (swimMatcher.matches(animal)) {
                System.out.println(animal.getName() + " can swim!");
            }
        }
    }
}