Overloaded method selection based on the parameter's real type

Question

I\'m experimenting with this code:

interface Callee {
    public void foo(Object o);
    public void foo(String s);
    public void foo(Integer i);
}

class          


        

Answer 1

Java looks at the reference type when trying to determine which method to call. If you want to force your code you choose the 'right' method, you can declare your fields as instances of the specific type:

Integeri = new Integer(12);
String s = "foobar";
Object o = new Object();

You could also cast your params as the type of the param:

callee.foo(i);
callee.foo((String)s);
callee.foo(((Integer)o);