Providing upcasting in java explicitly

Question

class P {
    void a() {
        System.out.println(\"a\");
    }
    void b() {
        System.out.println(\"b\");
    }
}

class C extends P {
    void c() {
        S         


        

Answer 1

P p = c;

Don't cast at all. A C is a P; no explicit conversion is required. With no cast, you make it clear that this operation cannot fail; with a cast, you force the reader to consider and discard the possibility that c is not an instance of P.