java - How to modify variables while thread is running -

First of all, I used Runnabal and created 'true' loop to continue my work . Now I find some difficulty when changing to use callable.

  Package Com; Import java.util.concurrent.Callable; Import java.util.concurrent.ExecutionException; Import java.util.concurrent.FutureTask; Public Class CallableAndFuture {Public Static Zero Main (String [] Args) halts exceptions, execution exceptions {ChildCallbale childCallbale = new ChildCallbale (); FutureTask & LT; Integer & gt; Future = New Future Task & lt; Integer & gt; (ChildCallbale); Thread thread = new thread (future); Thread.start (); ChildCallbale.setVar (1); Println (future.get ()); ChildCallbale.setVar (2); Println (future.get ()); }} Class ChildCollBell enforces callable & lt; Integer & gt; {Private Ent. Public Zero Set (Int World) {this.var = var; } @ Override Public Integer Call () throws exception {Thread.sleep (2000); Return var; }}  

As you see, I want to get different results as I did, unfortunately, 2 results are equal to 1. Not only do I want to know how to know my needs, I also want to know why my code goes wrong. thank you in advanced.