Wednesday, February 9, 2011

Get a Random Value Within a Given Range

Just the code:

public int getRandomValue(long min, long max) {
return (int) Math.max(min, (int) (Math.random() * max) + 1);

Use this to (obviously) generate an integer value between (inclusively) the given minimum and maximum - which is useful also to fetch random elements e.g. from a List.


  1. Hi,

    your proposed code will give you the min value more often depending on the entered values.
    Example: getRandomValue(95, 100) will statistically give you the value 95 in 95 % of the cases (when (Math.random() * max) + 1 is lower than 96.

    Better is something like this:

    return (int) (Math.random() * (max - min)) + min;