CODEWITHSUNDEEP
javastaticscope
user187744
user187744

Reputation: 71

Static variable out of scope, Error: cannot find symbol

the Error is:

cannot find symbol System.out.println("value of count" + count);

Symbol:

variable count

Location:

class synchronize

I declared count variable static so doesn't that mean every class can access it?

class a extends Thread 

{

public static int count=0;

public void run()

 {

   for(int i=1;i<=100;i++){

   count++;
    }
  }
}

class b extends Thread {

public void run(){

  for(int i=1;i<=100;i++){

  count++;
  }
 }
}

class synchronize {

public static void main(String args[]) {

  a obj =new a();

  b obj1=new b();

  obj.start();

  obj1.start();

  System.out.println("value of count "+count) ;

 }
}

Upvotes: 3

Views: 1807

Answers (3)

Andrew Mairose
Andrew Mairose

Reputation: 10995

Since it is public and static, you are correct in that you will be able to access the count variable in your a class from anywhere in your code.

However, you cannot access it just by using the variable count.

Your other classes do not know about any count variable, but they know about your a class. So you can use a.count to access the count variable in your a class from any of your other classes.

Upvotes: 2

Blake Yarbrough
Blake Yarbrough

Reputation: 2316

the count variable is declared as a member of the a class.

So if you change:

System.out.println("value of count "+count);

To:

System.out.println("value of count " + a.count);

So that you are accessing the count variable as a member of the a class, then your synchornize class should be able to 'see' the count variable.

Also, you may want to use the a.count inside of class b as well:

class b extends Thread {

    public void run(){

      for(int i=1;i<=100;i++){

          a.count++;
       }
    }
}

Upvotes: 3

King
King

Reputation: 3095

Static variables have a single value for all instances of a class.

You have to access static variables by class name

instead of this

System.out.println("value of count "+count) ;

use this

System.out.println("value of count "+a.count) ;

Upvotes: 2

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