public TemperaturGUI()
{
    super(300,200);
    this.window.setTitle("Temperaturrechner");
    this.lblTitle = new Label(10,10,200,25,"Fahrenheit - Celsius");
    this.lblTitle.setFontSize(16);
    this.lblTitle.setFontStyle(true, false);

    this.txtCelsius = new TextField(10,100,75,25,"°C");

    this.txtFahrenheit = new TextField(215,100,75,25,"°F");
    
    this.btnCalc = new Button(10,135,280,25,"Berechne");   
}