static method in parent class

[satya kiran]

Hi,

I want to know what will be the out put and why it is so?

public class Merry {

static void doHelloGoodbye(Base b){
b.greeting();
b.farewell();
}

public static void main(String args[]){
Sub s = new Sub();
doHelloGoodbye(s);
}
}


class Base{
static void greeting(){
System.out.println("Hello");
}
void farewell(){
System.out.println("Goodbye");
}
}

class Sub extends Base{
static void greeting(){
System.out.println("Hi");
}
void farewell(){
System.out.println("See ya!");
}
}

Thanks in advance.

[bnkiran kumar]

you will get an output of Hello,see ya, because you are assigning object ot Sub class to reference variable of Base class in doHelloGoodBye method,for static methods ,the method in class of referenc variable is called,in this example method in Base class would be called,where as for non static methods in the class whose object was prepared is called in your example it is method from Sub class.

so answers will be like that.

[Ashok George]

exactly kiran!!!
thats good explanation!!

[wise owen]

this thread

[khateeb syed]

Hello Kiran,

I understand the call to farewell() will invoke the version overridden in Sub call, but why is the call to static method greeting() will invoke the method defined in Base class(inspite of the fact that both the reference variable & the object are of the Sub class type). Is it because the static method in Base class is hiding the static method in sub class?.

Thanks in advance.

[Keith Lynn]

Because the parameter of the method doHelloGoodbye is of type Base, the reference is automatically upcast to a Base reference.

[satya kiran]

Thank you. Your explanation is very helpful for me to understand the result.