Lesson 1 Video Using Timer.. about 6:17 into the Video

So far I have completed all of the videos and exercises so far so good.
But the very last example using the counter (implements CountListener).
So I removed all the previous code and deletes the associated Java files from the previous exerces and had the same emlet code as in Video.
I noticed that before you typed in " impements CountListener" there are already 2 Java Programmes in the list
CountListener and CountDevice.
Where do these come from?
After I add the " implements CounterListener" in my programme and ckick on the icon to create the inmort - a new file is generated..
Perhaps a naive question, since I am new to Java ( Yes, I am aware that the course requires java experience
but I didn't want to miss this course and the next course date is undetermined.)

Hi -
Exactly right - CountListener is an interface that I added to the NetBeans project, and CountDevice is a class.
BTW: the project that I show in the video is on the Course page, under the Supporting Materials section - the Callback Listener example.
Unzip TestIMletListener.zip on your machine, and then open the project (TestIMletListener) from Netbeans.
Tom

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Lesson 1 Video Using Timer.. about 6:17 into the Video

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