Using inherited overloaded methods

Question

I have two classes:

public class ClassA {
    public void method(Number n) {
        System.out.println(\"ClassA: \" + n + \" \" + n.getClass());
    }
}
         


        

Answer 1

You had the following code

Class A a = new ClassB(); 
a.method(3);

But imagine you have a method where "a" and "3" are passed to you as a parameter and you still execute the same code

public void foo(A a, Number n)
{
    a.method(n);
}

The compiler does not know whether you are going to pass Class A or Class B (or Number or Integer). It must still resolve the method so it can do type checking for the return value from a.method