Inheritance ....

[Ravindra Gupta]

class Test29{

public static void main(String args[])
{
S2 s2=new S2();
s2.display();
}
}


class S1{
String s="S1";
void display(){
System.out.println(s);
}
}
class S2 extends S1{
String s="S2";
}

the above example displays :S1
Please tell me if the method has been inherited ,why it is not displaying S2.

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Cheers~
Ravindra Gupta
[email protected]

[Kathy Rogers]

S2 is inheriting S1's display() method and working fine. What's confusing is what it's printing it out - because you've got a String s variable in both classes. S2 inherits S1's String s and that's what the display() method is using. If you declare and initialise a class member variable with the same name in a parent and a child class, you will always end up with a variable set to the value specified in the parent class when you create an instance of the sub-class. You can either change the value in the constructor of the sub-class or change it after the instance is created.
So if you want to set s to something different for the S2 sub-class, you need to set it in a constructor like this:-
class S2 extends S1{
S2()
{
s = "S2";
}
}
Hope that helps,
Kathy

[Bharatesh H Kakamari]

Overriding a method in the sub class is valid. But the same with a variable is termed as shadowing. The variable in the subclass shodows the variable in the super class. If the method display() was in the subclass it prints the subclass value. But outside of the sub class this variable is illegal, hence super class's value is printed.
HTH