Java static keyword issue

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I read this in a post that static variables are not inherited in Java.. I wrote a code to check for the same but I dont understand why is it inheriting.. Here is the code..

class B{
    static String name = "ABCD";
}

class Abc {
    public static void main(String args[] ) throws Exception{
        C c = new C();
        c.disp();
    }
}

class C extends B{
    void disp(){
        System.out.println(name); // Inheriting name from B
    }
}

The code prints "ABCD" on the console.. Please tell me what I am missing here..

Thanks In Advance..!

What I have tried:

I am trying to check whether static variables can be inherited or not..

Posted 30-Jan-18 7:49am

Akshit Gupta

Updated 6-Feb-18 4:45am

v4

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3 solutions

Solution 1

maerics on Stack Overflow[^]:
Static variables in Java are not inherited, they exist only in the class which declares them; however, they can be accessed implicitly by referring to an instance or subclass (or subclass instance) of the class which defines the static variable.

So, name only exists in B, but you can also access it using C.name (so from code in the C class, just name is enough).

Posted 30-Jan-18 8:31am

Thomas Daniels

Comments

Akshit Gupta 30-Jan-18 14:35pm

Thank you sir for reverting.. But how to differentiate whether the variable is inherited or statically called.. I mean we call the inherited variables the same way.. If I am not wrong

Thomas Daniels 30-Jan-18 14:38pm

As OriginalGriff said in his answer:

"And inherited members can be overridden, hidden, or replaced."

That's a notable difference: you cannot do that for the 'name' variable.

Solution 3

Static method in Java is a method which belongs to the class and not to the object. A static method can access only static data.

    It is a method which belongs to the class and not to the object(instance)
    A static method can access only static data. It can not access non-static data (instance variables)
    A static method can call only other static methods and can not call a non-static method from it.
    A static method can be accessed directly by the class name and doesn’t need any object
    A static method cannot refer to "this" or "super" keywords in anyway

Posted 6-Feb-18 4:45am

Sahi Repswal

v2

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CHill60 6-Feb-18 10:47am

If you copy stuff from a page found by a google search you should credit your source otherwise you will accused of plagiarism.

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This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

OriginalGriff · Accepted Answer · 2018-01-30T08:33:00

Static variables in Java are not inherited, because they are a part of the class implementation, not of the instance-of-a-class implementation - they are not members of a class instance.

What that means is that a "normal" variable is part of the class instance: thisOne contains a different "copy" of a nonstatic varianle myVar that thatOne - thisOne.myVar does not contain the same number as thatOne.myVar.

But static variables are the same for all instances because they are not a part of the instance, there is one space allocated and it is referred to by all instances (or even without an instance at all).

And inherited members can be overridden, hidden, or replaced.

Which means static members can't be inherited: because the inherited version would need to potentially be different for your class C that it would be for class A and that can't happen.

Java static keyword issue

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Java static keyword issue

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