Java Question Handler

    static class MyHandler extends Handler { 
        WeakReference<Demo> outerClass; 
     
        MyHandler(Demo activity) { 
            outerClass = new WeakReference<Demo>(activity); 
        } 
     
        @Override
        public void handleMessage(Message msg) {
            Demo theClass = outerClass.get(); 
            switch (msg.what) {
                case 1:
                    theClass.pd.dismiss();