What would be the code for a previous button?

Question

I am passing Strings from an array to JTextArea. When I hit the "next" button on my jtoolbar, it shows the next string in the array. This is the code I have for the next button:
static final public String NEXT = "next";
String cmd = e.getActionCommand();
String[] arr =
"the strings",
"that i am",
"passing to JTextArea"
if(NEXT.equals(cmd)
showNextValue();
public void showNextValue()
textArea.setText(arr[index]);
index = (index+1)%arr.length;
My question is:
how would I write the code for the method showPreviousValue() without getting an indexoutofbounds exception? It would do the same thing as showNextValue, but show the user the previous string when they hit the previous button.
Thank you!!!

Answer 1

how would I write the code for the method showPreviousValue() without getting an indexoutofbounds exception?I'm guessing that you tried something and got an IndexOutOfBounds exception. You might do better to post what you tried.
Basically you need to figure out why the exception occurs - for instance by printing the value of the expression that you were using as the index value. And then figure out some way of avoiding that problem. (Probably a little bit of arithmetic.)