Using recursion, compute the sum of all values in an array.

public class DataSet
{
   public DataSet(int[] values, int first, int last) { . . . }
   public int getSum() { . . . }
   . . .
}

Complete the following files:

DataSet.java

/** Computes the sum of a set of data values. */ public class DataSet { private int[] values; private int first; private int last; /** Constructs a DataSet object. @param values the data values @param first the first value in the data set @param last the last value in the data set */ public DataSet(int[] values, int first, int last) { this.values = values; this.first = first; this.last = last; } /** Gets the sum in the set of data values @return the sum value in the set */ public int getSum() { . . . } }

DataSetTester2.java

Use the following file:

DataSetTester.java

import java.util.Random;

/**
   A tester class for the recursive sum.
*/
public class DataSetTester
{
   public static void main(String[] args)
   {
      final int LENGTH = 10;
      int[] values = new int[LENGTH];
      
      for (int i = 0; i < values.length; i++)
      {
         values[i] = i - 5;
      }
      DataSet d = new DataSet(values, 0, values.length - 1);
      System.out.println("Sum: " + d.getSum());
      System.out.println("Expected: -5");
   }
}