Please Explain ME how it works

[Dheeraj Mhetre]

hi all java Ranchers please Explain me how the code works...
it gives answer 22 ...

class Base
{
int i;
Base ( )
{
add(1);
}
void add(int v)
{
i += v;
}
void print()
{
System.out.println(i);
}
}
class Extension extends Base
{
Extension ()
{
add(2);
}
void add (int v)
{
i += v*2;
}
}
public class foo
{
public static void main(String args[])
{
logo(new Extension());
}
static void logo(Base b)
{
b.add(8);
b.print();
}
}

[Manfred Leonhardt]

Hi Dheeraj,
Lets step through the program starting a foo.main:
1. Create new Extension for logo method parameter
2. Extension constructor: compiler automatically places call to
base constructor as first line.
3. Base constructor (i = 0) calls add method with param = 1
4. Extension add method: i += 2 --> i = 2
5. Extension constructor calls add method with param = 2
6. Extension add method: i += 4 --> i = 6
7. Logo method calls add method with param = 8
8. Extension add method: i += 16 --> i = 22
9. Logo method calls print method
10. Base print method: prints out "22".
Regards,
Manfred.

[Dheeraj Mhetre]

hi Manfred.....
thank you for quick reply... now i got the answer...
that means " add " method of Extension class is called
thrice....
ok thank you...
dheeraj