package {
    import flash.text.TextField;
    import flash.display.Sprite;
    public class TextHello extends Sprite {
        public function TextHello() {
            var tf:TextField = new TextField();
            tf.text = "Hello World!"
            tf.x = 50;
            tf.y = 40;
            addChild(tf);
        }
    }
}
This class uses the TextField class to display the text.