What does this program print? How does Java know which getJuice() method to call when there are so many of them?

abstract class Fruit{ public abstract String getJuice(); } class Mango extends Fruit{ @Override public String getJuice(){ return "Mango juice"; } } class Apple extends Fruit{ @Override public String getJuice(){ return "Apple juice"; } } public class Main{ public static void main(String[] args){ Fruit f = new Mango(); String juice = f.getJuice(); System.out.println(juice); } }