Question

Given the following Java code:

class C {
    public int foo(C p) { return 1; }
}

class D extends C {
    public int foo(C p) { return 2; }
    public int foo(D p) { return 3; }
}

C p = new C();
C q = new D();
D r = new D();

int i = p.foo(r);
int j = q.foo(q);
int k = q.foo(r);

(Remember that in Java every object is accessed through a pointer and that methods are virtual by default.)

Which methods get called in the three calls, i.e., what are the values of i, j, and k? Explain how the method selection works to result in these values.

Answer 1

p.foo() will call the foo in the class C and returns the 1 as p is pointing to object of class C
q.foo(); will call the foo in the class C and returns the 2 as q is pointing to object of class D
q.foo(): will call the foo in the class C and returns the 3 as q is pointing to object of class D
and the parameter is type of Class D so it will directly class foo with D as param

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