Question

This is my first time using stackoverflow for a question that I need to ask, so hopefully I can get some help. This is a school assignment that I am working on, and although I have already turned it in and am going to change the code pretty drastically soon, I would like to figure out what is wrong first. This is basically a purchase history program, where the past purchases are stored and can be accessed as receipts with a ‘next’ and ‘back’ button. There is no file access, and all the data is generated randomly. The random data generation wasn’t a requirement of the assignment, but I wanted to do it that way as a learning experience.

On to the question, what is going on with this error?

    Exception in thread "AWT-EventQueue-0" java.lang.IndexOutOfBoundsException: Index: 9, Size: 9
at java.util.ArrayList.RangeCheck(ArrayList.java:547)
at java.util.ArrayList.get(ArrayList.java:322)
at farmmark.Storage.getItems(Storage.java:36)
at farmmark.Gui.buttonActionNext(Gui.java:415)
at farmmark.Gui$ButtonHandler.actionPerformed(Gui.java:632)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
at java.awt.Component.processMouseEvent(Component.java:6290)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
at java.awt.Component.processEvent(Component.java:6055)
at java.awt.Container.processEvent(Container.java:2039)
at java.awt.Component.dispatchEventImpl(Component.java:4653)
at java.awt.Container.dispatchEventImpl(Container.java:2097)
at java.awt.Component.dispatchEvent(Component.java:4481)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4575)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4236)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4166)
at java.awt.Container.dispatchEventImpl(Container.java:2083)
at java.awt.Window.dispatchEventImpl(Window.java:2482)
at java.awt.Component.dispatchEvent(Component.java:4481)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:648)
at java.awt.EventQueue.access$000(EventQueue.java:84)
at java.awt.EventQueue$1.run(EventQueue.java:607)
at java.awt.EventQueue$1.run(EventQueue.java:605)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98)
at java.awt.EventQueue$2.run(EventQueue.java:621)
at java.awt.EventQueue$2.run(EventQueue.java:619)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:618)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
    BUILD SUCCESSFUL (total time: 6 seconds)

There is a lot of code, probably too much to post here, so here is a link to the source:
http://www.mediafire.com/?3ogc334vwh6t7k6

Here are the spots of code where the error occurs:

at farmmark.Storage.getItems(Storage.java:36)

public static String[] getItems(int select)
{
    return itemList.get(select);
}

at farmmark.Gui.buttonActionNext(Gui.java:415)

String items[] = Storage.getItems(counter);

at farmmark.Gui$ButtonHandler.actionPerformed(Gui.java:631)

else if(sel.equals("Next"))
        {
            jtxtItems.setText(null);
            jtxtPrices.setText(null);
            jtxtSkus.setText(null);
            jtxtCase.setText(null);
            jtxtVend.setText(null);
            panel.removeAll();
            buttonActionNext();
        {

Any help would be great, keep in mind I have only been programming in java for 8 weeks :P. Thanks in advanced!

Answer 1

Here’s where to look:

at farmmark.Storage.getItems(Storage.java:36)

Here’s the method:

public static String[] getItems(int select)
{
    return itemList.get(select);
}

The value for select is either less than zero or greater than (itemList.length-1).

Run in a debugger, set a breakpoint at that line, and see what’s up.

I don’t see where either itemList or select is set. Take a look at those methods as well.

Just curious – why is that method static?