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What is your value for PI? Also, the data type. I just tested this code and it works just fine. My only guess now is that your PI variable is set wrong :/



public static double volume (int r,...

For some odd reason it's returning a comma rather than the period. Try using this as your format "###.##"

Not too sure why it is returning a comma there though.

Your DecimalFormat object returns a String object. Use the Double class to parse the String and return a double value.