General reminders:

Your name and assignment within the fir st 4 lines of source code in each file.
Include ALL files for the project to run.
Your name and assignment should show in GUI or console when the program runs.
Use the specified file/class names for the project.  If you need more classes, that's okay.
If you use JFileChooser: leave it opening in user.home directory! That is, with the no-arg constructor -- not JFileChooser(".")  If you want to speed up your debugging, feel free to pre-load the text box with something like
"C:\\users\\...\\mytestdata.txt"
Please don't use any "package" statements!
You will submit FilesAreFun.java

It will use JFileChooser to allow the user to choose a file to copy.

If the user selects Cancel, the program should display "Ok, if you say so." and stop using System.exit(1).



Now use JFileChooser.showSaveDialog to allow the user to select a file to write.

If the user cancels, the program should display "No output, eh?" and stop using a System.exit(2)

If the file exists, you should warn the user, and allow the user to select a different file name if they want, or write over the existing file if they want.

(Hint: use File and the .exists() boolean method)



If the user selects an output file, you should copy the file from the input  to the output , line by line.  However, each input line should be preceded by a line number.

For example, if the input file looks like:

***********************************************

john
mildred
fred
ralph t. iguana
tammerlane
Gengis
Attila

***********************************************

the output file should look like:

***********************************************

1: john
2: mildred
3: fred
4: ralph t. iguana
5: tammerlane
6: Gengis
7: Attila

***********************************************

When your program completes, it should display a message like:

"Done, successfully copied 7 lines."





Extra credit opportunity: format the line number as four digit numbers so things line up nicely if there are more than 10 lines in the file:

***********************************************

0001: john
0002: mildred
0003: fred
0004: ralph t. iguana
0005: tammerlane
0006: Gengis
0007: Attila

***********************************************