How to access variable value global in android.

public class MainActivity extends ActionBarActivity {
     String n="";
    Timer timer;
    TimerTask timerTask;
    final android.os.Handler handler = new android.os.Handler();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
       startTimer();
        Test2();
    }
    public void startTimer() {
//        Pull();
        //set a new Timer
        timer = new Timer();

        //initialize the TimerTask's job
        initializeTimerTask();

        //schedule the timer, after the first 5000ms the TimerTask will run every 10000ms
        timer.schedule(timerTask,0, 15000); //
    }
    public void Timer15()
    {

        timer =new Timer();
        initializeTimerTask();
        timer.schedule(timerTask,0,5000);
    }

    public void initializeTimerTask() {

        timerTask = new TimerTask() {
            public void run() {

                //use a handler to run a toast that shows the current timestamp
                handler.post(new Runnable() {
                    public void run() {
                        Test1();


//                        Toast.makeText(getApplicationContext(),"hai",Toast.LENGTH_SHORT).show();
                    }
                });
            }
        };
    }
   public void Test1()
   {
     n="vetri";//Assigning value for n

   }
    public  void Test2()
    {
        if (n=="vetri")//Here n value is null
        {
            timer.cancel();
            Timer15();
            Toast.makeText(getApplicationContext(),n,Toast.LENGTH_LONG).show();
        }
        else
        {
            Toast.makeText(getApplicationContext(),"Error",Toast.LENGTH_LONG).show();
        }

    }
    
}