How can I use random numbers in groovy

Question

I use this method  def getRandomNumber int num       Random random   new Random       return random getRandomDigits num     when I call it I write println getRandomNumber 4  but I have an error No signature of method  java util Random getRandomDigits   is applicable for argument types   java lang Integer  values   4   Note  I use this method in another groovy class and it works properly without any error

User · Accepted Answer

There is no such method as java util Random getRandomDigits   To get a random number use nextInt   return random nextInt 10    num    Also you should create the random object once when your application starts   Random random   new Random     You should not create a new random object every time you want a new random number  Doing this destroys the randomness

User · Answer

If you want to generate random numbers in range including  0    use the following while  max  is the maximum number in the range   Random rand   new Random   random num   rand nextInt max 1

User · Answer

Generally  I find RandomUtils  from Apache commons lang  an easier way to generate random numbers than java util Random

User · Answer

Generate pseudo random numbers between 1 and an  UPPER LIMIT   You can use the following to generate a number between 1 and an upper limit   Math abs new Random   nextInt      UPPER LIMIT     1  Here is a specific example   Example - Generate pseudo random numbers in the range 1 to 600   Math abs new Random   nextInt     600    1   This will generate a random number within a range for you   In this case 1-600   You can change the value 600 to anything you need in the range of integers     Generate pseudo random numbers between a  LOWER LIMIT  and an  UPPER LIMIT   If you want to use a lower bound that is not equal to 1 then you can use the following formula   Math abs new Random   nextInt       UPPER LIMIT  -  LOWER LIMIT       LOWER LIMIT   Here is a specific example   Example - Generate pseudo random numbers in the range of 40 to 99   Math abs  new Random   nextInt      99 - 40      40   This will generate a random number within a range of 40 and 99

User · Answer

For example  let s say that you want to create a random number between  50 and 60  you can use one of the following methods    new Random   nextInt   6  55   new Random   nextInt   6 returns a value between -5 and 5  and when you add it to 55 you can get values between 50 and 60  Second method   Math abs new Random   nextInt   11   50   Math abs new Random   nextInt   11  creates a value between 0 and 10  Later you can add 50 which in the will give you a value between 50 and 60

[groovy] How can I use random numbers in groovy?

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