So, what's the conclusion here?
1. Do not use double/float for floating-point arithmetic in Java, use BigDecimal instead. This is because Java cannot represent floating-point precisely.
2. Do not use == or != as a floating-point comparison. Compare Float.floatToIntBits (float) or Double.doubleToLongBits (double) instead. If == or != is used on float/double, there's a possibility that the code will go into infinite loop.
3. Always use BigDecimal for temporary variables, which will be processed/involved in future calculations. Convert the values to float/double only if you want to persist them into the database.
source: http://epramono.blogspot.com/2005/01/double-vs-bigdecimal.html
