Why java compiler not showing exception for not implementing interface method?

I am implementing Java 8 interface default method as follows,

**

package com.company;
interface  defualtdemo
{
    default void print(){
        System.out.println("Print 1");
    }
}
interface  defualtdemo1
{
    default void print(){
        System.out.println("Print 2");
    }
}
abstract class demo{
    public void print()
    {
        System.out.println("Abstract Print");
    }
}
public class Main extends demo implements defualtdemo,defualtdemo1 {
//    public void print(){
//        System.out.println("Main Print");
//    }
    interface MathOpertion{
        public int opertion(int a,int b);
    }
    public static void main(String[] args) {
        new Main().print();
        MathOpertion add=(int a,int b)->{return a+b;};
        MathOpertion sub=(int a,int b)->{return a-b;};
        System.out.println(add.opertion(10,5));
        System.out.println(sub.opertion(10,5));
    }
}

**

Even not implementing a default method "Print" still showing output like follows,

Abstract Print 15 5

My question is why java compiler not showing EXCEPTION FOR NOT IMPLEMENTING "Print" METHOD IN MAIN CLASS?.