Android™ How to Program, Second Edition

Class FibonacciNumbers

Class FibonacciNumbers (Fig. J.16) displays a window containing two sets of GUI components—one set to compute a Fibonacci number in a worker thread and another to get the next Fibonacci number in response to the user’s clicking a JButton. The constructor (lines 38–109) places these components in separate titled JPanels. Lines 46–47 and 78–79 add two JLabels, a JTextField and a JButton to the workerJPanel to allow the user to enter an integer whose Fibonacci number will be calculated by the BackgroundWorker. Lines 84–85 and 103 add two JLabels and a JButton to the event dispatch thread panel to allow the user to get the next Fibonacci number in the sequence. Instance variables n1 and n2 contain the previous two Fibonacci ...