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I don't think there is a right or wrong answer to this question...it depends upon context. Math.random is static, and so can be easily accessed across classes and this alone may make it more often...

As a side note: behind the scenes, Math.random uses a static instance of Random and its nextDouble function to generate a random number. IMO that 'middle man' design makes getting a random number...

You should draw the random prior to initiating the loop. I don't know what getRanNumber() actually does because the code isn't posted for it, but based upon this it doesn't look like its needed


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