Question

The Java api has a method on how to generate integers between 0(inclusive) and n(exclusive), but does not have a method to generate random numbers of double values, given a certain range, say 2.0 to 3.0. How can this be done?

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 double x = 0.7 + Double.valueOf(Math.random()*(9.0-0.7)).intValue(); 

The result its just few numbers of type .7

Answer 1

You’re very close, but the intValue() call is unnecessary and the Double.valueOf( String ) call shouldn’t even compile.

public double random( double min, double max )
{
  double diff = max - min;
  return min + Math.random( ) * diff;
}