Question

Which of the B.m methods below are function subtypes of A.m? For each of the B.m methods answer whether the method would overload or override A.m in Java. Assume Z is a subclass of Y, and Y is subclass of X.

class A {

Object m(X y, String s);

}

class B extends A {

X m(X y, String s);

Y m(Object y, Object s);

Z m(Y y, String s);

}

Answer 1

X m(X y, String s); is overload method.
as X is subclass of Object.

Z m(Y y, String s); is overload method.
as Z is subclass of Object and Y is subclass of X.