CodeCheck

Complete the Sentence class below so that it implements the Measurable interface. The measure of a sentence should be the number of words. For example,

Sentence.java

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public class Sentence implements Measurable
{
   /**
      Constructs a sentence.
      @param text the text of the sentence. 
   */
   public Sentence(String text)
   {
      int n = text.length();
      String punctuation = text.substring(n - 1, n);
      words = text.substring(0, n - 1).split("\\s+");
   }
   
   /**
      Returns a word in this sentence.
      @param the index of the word 
      @return the ith word or an empty string if i is < 0
      or >= the number of words in this sentence
   */
   public String getWord(int i)
   {
      if (i >= 0 && i < words.length)
         return words[i];
      else
         return "";
   }
   
   public String toString()
   {
      String r = "";
      for (String w : words)
      {
         if (r.length() > 0) r += " ";
         r += w;
      }
      return r + punctuation;
   }
   // TODO: Do what it takes to implement the measurable interface
   // so that the measure of a sentence is the number of words.
   
   private String[] words;
   private String punctuation;
}
 
 
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DataSet.java

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/**
   Computes the average of a set of data values.
*/
public class DataSet
{
   /**
      Constructs an empty data set.
   */
   public DataSet()
   {
      sum = 0;
      count = 0;
      maximum = null;
   }
   /**
      Adds a data value to the data set.
      @param x a data value
   */
   public void add(Measurable x)
   {
      sum = sum + x.getMeasure();
      if (count == 0 || maximum.getMeasure() < x.getMeasure())
         maximum = x;
      count++;
   }
   /**
      Gets the average of the added data.
      @return the average or 0 if no data has been added
   */
   public double getAverage()
   {
      if (count == 0) return 0;
      else return sum / count;
   }
   /**
      Gets the largest of the added data.
      @return the maximum or 0 if no data has been added
   */
   public Measurable getMaximum()
   {
      return maximum;
   }
   private double sum;
   private Measurable maximum;
   private int count;
}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Measurable.java

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/**
   Describes any class whose objects can be measured.
*/
public interface Measurable
{
   /**
      Computes the measure of the object.
      @return the measure
   */
   double getMeasure();
}
 
 
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SentenceTester.java

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/**
   This program tests adding sentences to the DataSet class.
*/
public class SentenceTester
{
   public static void main(String[] args)
   {
      DataSet data = new DataSet();
      data.add(new Sentence("Mary had a little lamb."));
      data.add(new Sentence("Its face was white as snow."));
      data.add(new Sentence("And everywhere that Mary went,"));
      data.add(new Sentence("The lamb was sure to go."));
      System.out.println("Average measure: " 
            + data.getAverage());
      System.out.println("Expected: 5.5");
   }
}
 
 
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