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javainheritancestatic-variables
Krishna
Krishna

Reputation: 73

Java Inheritance of Static Variable

I have a static variable in my Base123 class

class Base123 {
    public static int statvar;
}

and I have a derived class, Inheritance111, which extends Base123

public class Inheritance111 extends Base123 {

    public static void main(String[] args) {
        System.out.println(Inheritance111.statvar);
        System.out.println(Base123.statvar);
        Base123.statvar=10;
        System.out.println(Inheritance111.statvar);
        System.out.println(Base123.statvar);
        System.out.println(statvar);
        Inheritance111.statvar=20;
        System.out.println(Inheritance111.statvar);
        System.out.println(Base123.statvar);
        System.out.println(statvar);
    }
}

I obtained the output for above code as :

0 0 10 10 10 20 20 20

For one class, the static variable is shared across all the objects of the class. But when a class is extended, is the inherited variable in the subclass also the same variable? As the changes made using 

Inheritance111.statvar=20;

is changing the value of Base123.statvar.

Upvotes: 1

Views: 71

Answers (1)

Tarun
Tarun

Reputation: 986

Yes it refers to same variable as Super class even if you call variable from sub class like Inheritance111.statvar=20;.
You can refer to this JavaDoc static fields

Upvotes: 1

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