![]() ![]() ![]() (Of course, more involved applications will use additional classes defined in other Java files.) After the class declaration, we declare some class variables such as timeline (Timeline), timerLabel (Label), and timeSeconds (Integer). If you use the NetBeans IDE, the IDE will build a skeletal JavaFX application for you. The JavaFX runtime constructs the Application class instance and invokes your start() method. JavaFX applications extend the Application class and override the start() method. Let’s look at the program structure and the graphical components first. Listing 1 shows all of the code except the button’s event handler code (lines 46-51), which we’ll see later. Anytime you click the Start Timer button, the timer resets to 15 and restarts the countdown. ![]() The numeric display then counts down-once per second-to zero. To start the timer, you click the Start Timer button. Here is a screenshot of the application as it comes up. ![]()
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