This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
Hi Jason, You have a null pointer at line 13 in file "shapeDriver.java" (or is this a 'trick' question :-) Perhaps if you posted (at least) line 13 of file "shapeDriver.java", I may be able to offer more. Good Luck, Avi.
Without any code, the best guess would be that you are using a variable or class instance without instantiating it. That's usually what causes my 'nullpointer exception' errors....how bout some more code?
-nothing important to say, but learnin' plenty-