This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
As for your question, the answer is - none. The relationship between Apple and BagOfApples (if they really reflect what their names are) does not correspond to the relationship inheritance represents.
For instance you might have one class, say Fruit, that would be the base class for your Apple class.
Check tutorial on Inheritance to get a better understanding of what it actually is.
The quieter you are, the more you are able to hear.