why the out put is 10

[javastuden]

Hi,
Why the output is 10
class Q16
{
public static void main(String args[])
{
A a = new B();
a.callme();
System.out.println(a.r);


}
}


class A
{
void callme()
{
System.out.println("A");
}
int r=10;



}
class B extends A
{
public void callme()
{
System.out.println("B");
}
int r=20;


}


Result be
B
10

[Fubarable]

Tsk, tsk... You've posted more than 30 times here and should know about using code tags.

So this exercise makes you think a bit about the nature of polymorphism in Java -- does Java allow for polymorphism for both methods and fields or just methods alone?

[javastuden]

thank for your reply

it will invoke the methods

then

class Earth{

public static void main(String[] args) {
// Earths myEarth = new Earths();
//Planet myPlanet = (Planet)myEarth;
Planet myPlanet=new Earths();
myPlanet.hide();
myPlanet.override();
}
}
class Planet {
public static void hide() {
System.out.println("The hide method in Planet.");
}
public void override() {
System.out.println("The override method in Planet.");
}
}

class Earths extends Planet {
public static void hide() {
System.out.println("The hide method in Earth.");
}
public void override() {
System.out.println("The override method in Earth.");
}
}

same but different name pgm the out put is

The hide method in Planet.
The override method in Earth.

why it shows the value in parent class then in subclass

[Tolls]

Because this:
myPlanet.hide();
is not how you should call a static method. If you called it properly, as in:
Planet.hide();
you would know exactly why it called Planets hide() method and not Earths.