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

7.4.6 Using the Elements of an Array as Counters

Sometimes, programs use counter variables to summarize data, such as the results of a survey. In Fig. 6.7, we used separate counters in our die-rolling program to track the number of occurrences of each side of a six-sided die as the program rolled the die 6,000,000 times. An array version of this application is shown in Fig. 7.7.

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 1   // Fig. 7.7: RollDie.java 2   // Die-rolling program using arrays instead of switch. 3   import java.security.SecureRandom; 4  5   public class RollDie 6   { 7      public static void main(String[] args) 8      { 9         SecureRandom randomNumbers = new SecureRandom();10         int[] frequency = new int[7]; // array of frequency ...