What is the output of the following Java program?public class Main { static class A { void f(Object o) { System.out.print("O"); } void f(St…

What is the output of the following Java program?

public class Main {
    static class A {
        void f(Object o) { System.out.print("O"); }
        void f(String s) { System.out.print("S"); }
    }
    public static void main(String[] args) {
        A a = new A();
        Object o = "x";
        a.f(o); a.f("x"); a.f(null);
    }
}