Medium — java-8-lambdas — Step 1

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 = new AnimalMatcher() {
            @Override
            public boolean matches(Animal animal) {
                return animal.canHop();
            }
        };
        AnimalMatcher swimMatcher = new AnimalMatcher() {
            @Override
            public boolean matches(Animal animal) {
                return 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!");
            }
        }
    }
}