How to realize truncation and rounding of Java data

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When you convert float or double to an integer value, you always truncate that number, as in the following example:

Public class CastingNumbers {public static void main (String [] args) {double above = 0.7 above = 0.4; float fabove = 0.7f, fbelow = 0.4f; System.out.println ("(int) above:" + (int) above); System.out.println ("(int) below:" + (int) below); System.out.println ("(int) fabove:" + (int) fabove) System.out.println ("(int) fbelow:" + (int) fbelow);}}

Output:

(int) above: 0 (int) below: 0 (int) fabove: 0 (int) fbelow: 0

If you want to get rounded results, you need to use the round () method in java.lang.Math:

Public class RoundingNumbers {public static void main (String [] args) {double above = 0.7 above = 0.4; float fabove = 0.7f, fbelow = 0.4f; System.out.println ("Math.round (above):" + Math.round (above)); System.out.println ("Math.round (below):" + Math.round (below)) System.out.println ("Math.round (fabove):" + Math.round (fabove)); System.out.println ("Math.round (fbelow):" + Math.round (fbelow));}}

Output:

Math.round (above): 1 Math.round (below): 0 Math.round (fabove): 1 Math.round (fbelow): 0

Because round () is part of java.lang, no additional import is required to use it.

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