The Class has no error, but the test program has a constructor error on line 21.

/**
 * DataSet Class
 * 
 * @version 10/3/11
 */
public class DataSet
{
     private int Sum;
     private  double Average;
     private  int Largest;
     private  int Smallest;
     
     public DataSet(int Sum,int Largest,int Smallest, double Average)
    {
        Sum = 0;
        Average = 0;
        Largest = Integer.MIN_VALUE;
        Smallest = Integer.MAX_VALUE;
    }
    public void addValue(int x)
    {
        Sum = x+Sum;
        Average = (Average+x)/2;
        if (x < Smallest)
        {
            Smallest = x;
        }
        if (x > Largest)
        {
            Largest = x;
        }
    }
    public int getSum()
    {
        return Sum;
    }
    public int getLargest()
    {
        return Integer.MAX_VALUE;
    }
    public int getSmallest()
    {
        return Integer.MIN_VALUE;
    }
    public double getAverage()
    {
        return Average;
    }
    
}

The Test Program

/**
 * DataSet Test Program
 * 
 * @version 10/3/11
 */

import java.util.Scanner;
public class DataSetTest
{
    public static void main(String [] args)
    {
        int x;
        Scanner myScanner = new Scanner(System.in);
        System.out.println("Input a value: ");
        String answer = myScanner.nextLine();
        x = Integer.parseInt(answer);
       
        
        DataSet myData = new DataSet(x);
        System.out.println("The Sum is "+ myData.findSum());
        System.out.println("The Average is "+ myData.findAverage());
        System.out.println("The Smallest number is "+ myData.findSmallest());
        System.out.println("The Largest number is "+ myData.findLargest());
    }
}

The constructor is defined with 4 parameters (three of which shouldn't be there) and you call it with 1 parameter so that's an error.
You also need to decide whether your methods are called getXXX or findXXX

This article has been dead for over six months. Start a new discussion instead.