Thread: There's an arrayoutofbounds, but my partner coded this and he doesn't know whats wrong.

CmdView.txt

Originally Posted by Norm

You forgot to post the full text of the error message and the code where the error happens.

An arrayoutofbounds error happens when the index to an array goes past the end of the array.
Remember array indexes range in value from 0 to the array length-1

here's the error:

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0
at cs213.photoAlbum.simpleview.CmdView.main(CmdView.j ava:22)

Originally Posted by Norm

If there is no first element at index 0, the array must have a size of 0. The code needs to test the array's length before trying to index into the array with an invalid index.

right, the thing is I'm supposed to run it in command line mode and the arguments would be inputted before running the main class....
like this:

To add a new user:
java cs213.photoAlbum.simpleview.CmdView adduser <user id> "<user name>"
Output:
created user <user id> with name <user name>

I don't know how to change the code to wait for the user inputs then test it from there

I added this to my code, and it doesn't work.

                int count = 0;
        	cs213.photoAlbum.model.backend.readPerUser();
 
                //s.useDelimiter("\n");
 
        	System.out.println("Enter instruction");
        	Scanner input = new Scanner(System.in);
 
        	while(input.hasNext())
            {
            	count++;
            }
 
        	String a[] = new String[count];
 
 
                if(a[0].equals("listusers")==true){
                        cs213.photoAlbum.model.backend.listUsers();
                }

album.txt backend.txt controll.txt photo.txt user.txt CmdView.txt


these are the files. I'm supposed to implement a code that is allows a user to sign in and edit their albums, and photos. Also we're supposed to edit the captions, and tags. What I added to the CmdView in the before reply "doesn't work" because it doesn't allow me to add a user or list the photos. I just need to get the code to work and allow me to run the code my partner has written

I added the print statement and scanner to try to make the code work..but failed. The program is supposed to wait for the user to enter like:
To add a new user:
java cs213.photoAlbum.simpleview.CmdView adduser <user id> "<user name>"
Output:
created user <user id> with name <user name>
Or:
user <user id> already exists with name <user name>

and other functions too.

Say I wanted to add user, the user inputs the arguments of the user ID and user name. Then I take those arguments and save it and shows the existing photos under that name and albums.

Scratch the scanner stuff I added before, and I have read the scanner API doc but I want to read in Strings from the user. I want to read in String array arguments, but in Java the arguments are inputted after the main class has started running.

The User is supposed to type in the terminal the path and the specific function they want to do such as add user and the arguments are <userID> <"username">