🚀 go-pugleaf

interface Runner{
    public void run();
}
interface Swimmer{
    public double swim();
}
abstract class Animal{
    abstract public int eat();
}
class Person extends Animal implements Runner,Swimmer{
    public void run(){
        System.out.println("run!");
    }
    public double swim(){
        double speed = 20;
        //System.out.println(speed);
        return speed;
    }
    public int eat(){
        //System.out.println("3 times");
        return 3;
    }
}
public class Test{
    public static void main(String args[]){
        Test t = new Test();
        Person p = new Person();
        t.m1(p);
        t.m2(p);
        t.m3(p);
    }
    public void m1(Runner f){f.run();}
    public void m2(Swimmer g){g.swim();}
    public void m3(Animal a){a.eat();}
}

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