java.lang.NullPointerException

Arghhhhh. Can anyone see what i am doing wrong. :D The static format method takes a String and an Object[] as arguements. public static String format(String pattern, Object[] arguements) I have to create a Long object and put that into an Object array to pass to the format method but i keep getting a NullPointerException.
Any ideas why?

Sun should have just overloaded the format method to take various datatypes instead of an Object[] array. :rolleyes:

Code:

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class TimeTracker extends TimerTask{
  private Timer timer;
  private Long l;
  private TimeTrackerTest t;
  private long millis;
  Object[] o;

  public TimeTracker(JTextField jtf){
  this.t = t;
  o = new Object[1];
  timer = new Timer(true);
 }

 public void run(){
  try{
    millis = scheduledExecutionTime();
    l = new Long(millis);
    o[0] = l;
 
    t.jtf.setText(MessageFormat.format("{0}",o));
    }catch(Exception e){System.err.println(e);}
  }
}

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That's not the problem. The NullPointerException is thrown because you try to call a method of t, which is uninitialized:
t.jtf.setText(...

You think you're initializing it here:
this.t = t;
but you aren't, there is no t.

yup that was to problem. :) I was passing the wrong thing into the constructor. Must have been tired. :( At least im getting a clean compile now. :D Thanks for the help.

Code:

---

class TimeTracker extends TimerTask{
  private Timer timer;
  private Long l;
  private TimeTrackerTest t;
  private long millis;
  Object[] o;

  public TimeTracker(TimeTrackerTest t){
  this.t = t;
  o = new Object[1];
  timer = new Timer(true);
 }

 public void run(){
  try{
    millis = scheduledExecutionTime();
    l = new Long(millis);
    o[0] = l;
 
    t.jtf.setText(MessageFormat.format("{0}",o));
    }catch(Exception e){System.err.println(e);}
  }
}

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