Math.random() method
Tutorial Details:
A standard way to generate random numbers is to use the Math.random() method, which returens a double value in the range 0.0 up to, but not including 1.0. You can used multiplication to expand the range, addition to shift the range, and casting to convert it to an integer. The advantage of this method over the Random class (see below) is that there is no need to create an object. The disadvantage is that you often have to do more work to translate the return value into a range you want.
double Math.random()
Returns a number x in the range, 0.0 <= x < 1.0.
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