This week's giveaway is in the EJB and other Java EE Technologies forum. We're giving away four copies of EJB 3 in Action and have Debu Panda, Reza Rahman, Ryan Cuprak, and Michael Remijan on-line! See this thread for details.
Unless the Disk class has some method that returns its fields (instance variables) with an index or, as an array or, as a String that you can split into an array you'll have to hard–code the fields into the table columns as in the code below.
Instead of having the List list in class scope you could have createList return a reference to the list, ie
and send it into the getTable method as an argument. Either way, a reference to list must be available inside the getTable method or you get a NullPointer. NullPointer means "we can't find it!".
The stack trace that starts with "NullPointerException" will tell you the line number where the exception was thrown. Just count down the lines in your source code file to find out where the exception was thrown.
Joined: Sep 29, 2003
Thnx Craig.Thank you so much.It was really helpful.Your help is highly appreciated.