java - Why GUI not updating in Observer pattern? -

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i have observable class notifies observer when string changes. in observer's update method updated string can printed console. gui not updated accordingly. why?

public void update(observable o, object arg) {      string s=swimmingcompetition.init().getscoredata().getresults();     system.out.println(s); //this works     jtextarea1.settext(s); //this not  }

i bet neglecting invoke addobserver() on observer, or neglecting invoke both setchanged() and notifyobservers() in observable. complete examples shown here.


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