polymorphic behaviour

[tinks]

public class Base
{
void first()
{
System.out.println("first() from base");
second();
}
void second()
{
System.out.println("second() from base");
}
}
class Derived extends Base
{
void second()
{
System.out.println("second() from derived");
}
public static void main(String args[])
{
Base b = new Derived();
b.first();
}
}
when I call first() in base second()in derived is call how come when it should call second() base. please explain.

[Khalid Bou-Rabee]

When this code compiles and runs, the object reference b is constructed to have the Derived class's methods and members. Thus, when you call the first() method in this class you are calling the derived first() method from the class base, but it calls the newly overrided method from Derived.
Hope I helped you there,
Khalid
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~\// irucidal~

[Helen Yu]

Hi,there:
My question, since you said object b will have it own member method and instance variable, I initialized two variables, one in base class the other in derived class, why b.i will give the value in Base class instead of Derived one?
Thanks