android - java - access incremented static variable from another class -

i have static variable , updating it's value in class. when access variable class , shows unupdated value.

class a

  public static int postid = 1;    public static string creator()   {     string message = "post id="+postid;     return message;   }    void updatepostid()   {       postid++; //this function being called each 10 seconds   }    @override   public void start() {      handler.post(show);   }    handler handler = new handler();   private final runnable show = new runnable(){     public void run(){         ...                updatepostid();                handler.postdelayed(this, 10000);         }   }; 

class b

  string message = a.creator(); //this prints postid 1 time  

i need global variable can access each class , update value. waiting (i using android service)

this tested code .

public class {      public static int id = 0;      public static int increment(){         return a.id++;     }  }  public class b {      public static void main(string[] args) {         (int = 0; < 5; i++) {             system.out.println(a.increment());         }      } }