public void temperatureHandler() {
    if (cBox.getValue() == "Celsius (C)") {
        celsiusOutput.setText(Double.toString(dValue));
        fahrenheitOutput.setText(Double.toString((dValue * 1.8) + 32));
        kelvinOutput.setText(Double.toString(dValue + 273.15));
    }
    else if (cBox.getValue() == "Fahrenheit (F)") {
        celsiusOutput.setText(Double.toString((dValue - 32) / 1.8));
        fahrenheitOutput.setText(Double.toString(dValue));
        kelvinOutput.setText(Double.toString((dValue + 459.67) * 5/9));
    }
    else if (cBox.getValue() == "Kelvin (K)") {
        celsiusOutput.setText(Double.toString(dValue - 273.15));
        fahrenheitOutput.setText(Double.toString((dValue * 1.8) - 459.67));
        kelvinOutput.setText(Double.toString(dValue));
    }
}