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.
In the above statement, isbn is a primitive so you can't call compareTo method on it. But since it is a primitive, you can use comparison operator on it. So if you see the source code of Integer class, the compareTo method is implemented like this
You can implement your compareTo method in the same way too. To make it even simpler, you can just write