Java 计算频率

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public class Main 

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{

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   public static void main(String[] args)/*时代Java - nowjava.com 提 供*/

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   {

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      // student response array (more typically, input at run time)

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      int[] responses = {1, 3, 5, 4, 3, 5, 2, 1, 3, 3, 3, 4, 3, 3, 3, 

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         2, 3, 3, 2, 14};

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      int[] frequency = new int[6]; // array of frequency counters

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      for (int answer = 0; answer < responses.length; answer++)

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      {

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         try

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         {

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            ++frequency[responses[answer]];

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         } 

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         catch (ArrayIndexOutOfBoundsException e)

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         {/*时   代     Java  公  众  号 - nowjava.com 提 供*/

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            System.out.println(e); // invokes toString method

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            System.out.printf("   responses[%d] = %d%n%n", 

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               answer, responses[answer]);

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         } 

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      } 

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      System.out.printf("%s%10s%n", "Rating", "Frequency");

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