I am a beginner in java. Here is my code
class Super{
public int a;
}
class sub extends Super{
int a = 10;
}
public class test{
public static void main(String args[]){
Super var = new sub();
System.out.println(var.a);//Here I want to print 10 , value of sub class
}
}
Is it possible and if it is then please tell me how? And I having some problem with the title of this question, so please suggest me an appropriate one as i had explained everything what i want in my code.
You should add a getter method for a in your super class
public int getA(){
return a;
}
Subclass will inherit the getter too and you can access the value of a in the sublass. It is also recomebded to make class attribute protected or private instead of public.
getA() will always return 0, which is what the OP doesn't want.
Make the variables private and add a getA() method in both classes, with the one in the subclass overriding the superclass.
public class Foo
{
static class Super{
private int a;
public int getA() { return a; }
}
static class Sub extends Super{
private int a = 10;
@Override
public int getA() { return a; }
}
public static void main(String args[]) {
Super sup1 = new Super();
Super sup2 = new Sub();
Sub sub = new Sub();
System.out.println(sup1.getA());
System.out.println(sup2.getA());
System.out.println(sub.getA());
}
}
This outputs
0
10
10
getAinsuband returnsuper.a. But in the end this is senseless in terms of realistic programming, because shadowing a variable is quite a bad programming practice and should be avoided.subdoes already know the variableaand shouldn´t declare it again.