accessing local variables from inner classes in Java

[henry joe]

The code below complains about me assessing x in an inner class, what must I do to get the code working? Also, there is a complain on the TCIP ip = new TCIP() statement.

 class Internet{
       private int y=8;
       public static void main(String[] args){
           new Internet().go();
       }
       void go()
       {
           int x = 7;
           TCIP ip = new TCIP();
           class TCIP{
               void doit()
               {
                   System.out.println(y+x);
               } ip.doit();
           }
       }
               
   }

[Paul Clapham]

I suppose you are referring to a compiler error message? What exactly does that message say?

[Gaurangkumar Khalasi]

henry joe wrote:The code below complains about me assessing x in an inner class, what must I do to get the code working?

Mark x as a final variable. Because Method-inner class can not access local variables of the enclosing method. But it can access final variables...

henry joe wrote:Also, there is a complain on the TCIP ip = new TCIP() statement.

Because you have access the class before its definition. So do the following:

 class Internet{
       private int y=8;
       public static void main(String[] args){
           new Internet().go();
       }
       void go()
       {
           final int x = 7;
           class TCIP{
               void doit()
               {
                   System.out.println(y+x);
               } ip.doit();
           }
           TCIP ip = new TCIP();
       }     
   }

[Pritish Chakraborty]

If you're curious as to why the compiler requires the variable to be marked final, have a look at Local Inner Classes here -:

Suhrid's Wiki : Inner Classes