I need to round a float to two decimal places in Java

Question

Possible Duplicate    How to round a number to n decimal places in Java       I am having difficulties rounding a float to two decimal places   I have tried a few methods I have seen on here including simply just using Math round    but no matter what I do I keep getting unusual numbers   I have a list of floats that I am processing  the first in the list is displayed as 1 2975118E7   What is the E7   When I use Math round f   f is the float   I get the exact same number   I know I am doing something wrong  I just am not sure what   I just want the numbers to be in the format x xx   The first number should be 1 30  etc

User · Answer

Try looking at the BigDecimal Class  It is the go to class for currency and support accurate rounding

User · Answer

If you re looking for currency formatting  which you didn t specify  but it seems that is what you re looking for  try the NumberFormat class  It s very simple   double d   2 3d  NumberFormat formatter   NumberFormat getCurrencyInstance    String output   formatter format d     Which will output  depending on locale     2 30  Also  if currency isn t required  just the exact two decimal places  you can use this instead   NumberFormat formatter   NumberFormat getNumberInstance    formatter setMinimumFractionDigits 2   formatter setMaximumFractionDigits 2   String output   formatter format d     Which will output 2 30

User · Answer

You can make use of DecimalFormat to give you the style you wish   DecimalFormat df   new DecimalFormat  0 00E0    double number   1 2975118E7  System out println df format number        prints 1 30E7   Since it s in scientific notation  you won t be able to get the number any smaller than 107 without losing that many orders of magnitude of accuracy

User · Answer

1 2975118E7 is scientific notation    1 2975118E7   1 2975118   10 7   12975118   Also  Math round f  returns an integer  You can t use it to get your desired format x xx   You could use String format   String s   String format    2f   1 2975118      1 30

[java] I need to round a float to two decimal places in Java

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