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.

Just a quick one. Anyone know how to restrict the number of decimal places in a doouble value to 2?

I've had a look around and seen a few answer with silly caluculations (divide by 100 * by itself etc...) but none of them seem to work. All i want to do is reduce the decimal places for a value

so for example: 10.714285714285714% becomes 10.71%

If what you want to do is to obtain a textual representation of the value, with two decimal places, DecimalFormat is indeed the way to go.

If what you want to do is to perform calculations using only two decimal places, then you should not be using floating-point arithmetic. Instead, you should do integer calculations, using "hundredths" (if you're doing currency, call them "cents", "pence" etc.).

Betty Rubble? Well, I would go with Betty... but I'd be thinking of Wilma.