The solution above is appropriate. Basically, the default way of printing floating point numbers (double and float) is only intended for debugging, not nicely-formatted output. You should use something like a DecimalFormat to present floating-point numbers to the user.
Be aware, however, that floating-point arithmetic is not exact. This is nothing to do with Java; it's the same in all languages. Floating-point should be used where you need to store numbers with a wide range of value in a smallish, fixed amount of memory and fast computation and where approximation is acceptable.
Where you need total accuracy, you should not use floating-point. You should either use integers (int, long etc.), scaled appropriately (e.g. use an integer number of thousandths), or use the BigDecimal class. BigDecimal can represent quite a big range (not as big as floating-point), but uses much more memory than floating-point and is also slower to compute.
Currency (money) calculations are the most common example of where floating-point is inappropriate.
Never use floating-point for currency. Usually, the best thing to do is to use integers, representing all amounts as the smallest
unit in the currency (e.g. cents, pence).
