SimplestUsage.java

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public class SimplestUsage {
 
    public interface Animal {
 
        default String eat() {
            return this.getClass().getSimpleName()
                    + " eats like an ordinary animal";
        }
    }
 
    public static class Dog implements Animal {
    }
 
    public static class Mosquito implements Animal {
 
        @Override
        public String eat() {
            return "Mosquito consumes blood";
        }
    }
 
    public static void main(String[] args) {
        // "Dog eats like an ordinary animal" is output
        System.out.println(new Dog().eat());
 
        // "Mosquito consumes blood" is output
        System.out.println(new Mosquito().eat());
    }
}