Rounding numbers in Java

java.lang.Math class has a static method round() which accepts float and double values as a parameter and returns respectively int and long values.

For example, you have a number 3.1415 and want to round it to the nearest integer. Here's the Java code:

float pi = 3.1415f;
int rounded = Math.round(pi);

Note that when you write 3.1415, you actually write it as 3.1415f. This is because Java treats any decimal constant you write into your code as type double by default, and you must include a trailing 'f' if you wish the number to be treated as type float.

Feel free to post your questions or comments.