Hi all,
Having a shot at making my first independent app, but having issues
getting it to work.
Its a countdown timer app with Swing UI. I imagine the code for the
timer itself is kinda clunky, but I got it working previously with
some minor issues relating to not stopping the timer loop before
starting again. So I moved onto Timers to enable me to use stop() or
cancel() methods to end the loop.
So I now have a CountdownTimer class that extends java.util.Timer,
with a constructor
public CountdownTimer(){
}
which as far as I'm aware should allow creation of a CountdownTimer
object which will be a subclass of Timer.
In the GUI code I declare several variables, as soon as the class
declaration is out of the way, as well as creating a CountdownTimer
instance called timer1 using:
CountdownTimer timer 1 = new CountdownTimer();
Again as I understand it this should reference the constructor I
declared previously.
However, for some reason when I run the program I now get the
following error message:
SEVERE: Application class multitimer.MultiTimerApp failed to launch
java.lang.RuntimeException: Uncompilable source code - cannot find
symbol
symbol: constructor CountdownTimer(int,<anonymous
java.awt.event.ActionListener>)
location: class multitimer.MultiTimerView.CountdownTimer
at multitimer.MultiTimerView.<init>(MultiTimerView.java:418)
at multitimer.MultiTimerApp.startup(MultiTimerApp.java:21)
at org.jdesktop.application.Application$1.run(Application.java:
171)
at
java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
at
java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:
269)
at
java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:
184)
at
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:
174)
at
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:
122)
Exception in thread "AWT-EventQueue-0" java.lang.Error: Application
class multitimer.MultiTimerApp failed to launch
at org.jdesktop.application.Application$1.run(Application.java:
177)
at
java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
at
java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:
269)
at
java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:
184)
at
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:
174)
at
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:
122)
Caused by: java.lang.RuntimeException: Uncompilable source code -
cannot find symbol
symbol: constructor CountdownTimer(int,<anonymous
java.awt.event.ActionListener>)
location: class multitimer.MultiTimerView.CountdownTimer
at multitimer.MultiTimerView.<init>(MultiTimerView.java:418)
at multitimer.MultiTimerApp.startup(MultiTimerApp.java:21)
at org.jdesktop.application.Application$1.run(Application.java:
171)
... 8 more
I don't understand why it is giving a RuntimeException based on the
fact that it cannot find the constructor for CountdownTimer(int,
<anonymous java.awt.event.ActionListener>) when I've only told it to
use a CountdownTimer() constructor.
Anyone have any ideas?!
Cheers,
James
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