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Start your free trialSean M
7,344 PointsJava: Implement the chooser ui
private int promptForIndex(List<String> options) throws IOException {
int counter = 1;
for(String option: options) {
System.out.println("%d.) %s %n", counter, option);
counter++;
}
String optionAsString = mReader.readLine();
int choice = Integer.parseInt(optionAsString.trim());
System.out.println("Your choice: ");
return choice: -1;
}
I just wanted to know a little bit more of what this function is doing. Specifically, the purpose of the IOException, counter, and trim.
Thanks for the feedback.
Moderator edited: Slight correction of markdown.
1 Answer
Jennifer Nordell
Treehouse TeacherHi there, Sean M! I took the liberty of slightly correcting your markdown.
As for your question, the IOException
is thrown when something unexpected happens to the stream that is being read in. It could be any number of things. You could have the network die when reading in something over a network connection. Maybe it can't find the file. There are many different things that can happen to the stream that might cause it to return a null
. This is here to throw that error when this happens. You might check the documentation.
The counter
variable is used for formatting and letting the user know that they can pick a song by its number instead of typing the song name. We start it at one because that's how most humans count. You can see the results of this around 16:59 of the video. On the screen you should see:
1). Michael Jackson
That one is the counter.
Finally, the trim
method is used to trim any remaining whitespace from around what the user types in. This was covered around 2:42 of the video.
Hope this helps!
Sean M
7,344 PointsSean M
7,344 PointsI appreciate the quick repose Jennifer.
I've understood these concepts in previous material, I just needed some clarification for this example.
Thanks a lot.