what is anonymous classes

Question

what is anonymous classes is simple word ?
in below code what is @override?
and explain this all code

class Machine {
public void start() {
System.out.println("Starting...");
}
}

class Program {
public static void main(String[ ] args) {
Machine m = new Machine() {
@Override public void start() {
System.out.println("Wooooo");
}
};
m.start();
}
}

Answer 1

yes output coming "woooo"