java – Interface和Abstract类中的相同方法

public interface Intr {
    public void m1();
}

public abstract class Abs {
    public void m1() {
        System.out.println("Abs.m1()");
    }
    // public abstract void m1();
}

public class A extends Abs implements Intr {

    @Override
    public void m1() {
        // which method am I overriding,well it is Abs.m1() but why?
        // if method implemented is Abs.m1(),then why I am not getting error for Intr.m1() not implemented.
    }

}