Java™ How To Program (Early Objects), Tenth Edition

Rolling a Six-Sided Die 6,000,000 Times

To show that the numbers produced by nextInt occur with approximately equal likelihood, let’s simulate 6,000,000 rolls of a die with the application in Fig. 6.7. Each integer from 1 to 6 should appear approximately 1,000,000 times.

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 1   // Fig. 6.7: RollDie.java 2   // Roll a six-sided die 6,000,000 times. 3   import java.security.SecureRandom; 4  5   public class RollDie 6   { 7      public static void main(String[] args) 8      { 9         // randomNumbers object will produce secure random numbers10         SecureRandom randomNumbers = new SecureRandom();11 12         int frequency1 = 0; // count of 1s rolled13         int frequency2 = 0; // count of 2s rolled14          ...