Hands-On Design Patterns with Java

Slider-related methods

The final section of the ControlBox class provides methods to increase or decrease the slider value. It is important to check two things when adjusting the slider value. First, we need to ensure the power is on. We can check that by making a call to our hasPower() method. The second check is to ensure we do not go outside the minimum-maximum range, as follows:

    // Method to increase slider value    public void sliderIncrease () {        if (hasPower()) {            if (getSliderValue() < SLIDER_MAX) {                sliderValue++;                System.out.println(sliderValue); // simulate sending value to digital display            }         }    }    // Method to decrease slider value    public void sliderDecrease () {        if (hasPower()) {            if (getSliderValue() > SLIDER_MIN) {                sliderValue--; System. ...