A class named DataSet that computes the sum, the average, the largest and smallest values of a sequence of integers without the use of an array. DataSetTester.java test the DataSet class.

DataSet.java

//DataSet.java - Jimmy Kurian

public class DataSet
{
	private double sum;
	private int count;
	private int largest;
	private int smallest;


	public DataSet()
	{
		sum = 0;
		count = 0;
		largest = 0;
		smallest = 0;
	}

	public void addValue (int x)
	{
		sum = sum + x;

		if (count == 0 || sum < x)
		{
			largest = (x += (int)sum) + x;
		}
		else if (count == 0 || sum > x)
		{
			smallest = x;
		}

		count ++;

	}

	public double getAverage()
	{
		if (count == 0)
		{
			return 0;
		}

		else
		{
			return sum / count;
		}
	}

	public int getSum()
	{
		return (int)sum;
	}

	public int getLargest()
	{
		return largest;
	}

	public int getSmallest()
	{
		return smallest;
	}
}

DataSetTester.java

//DataSetTester.java - Jimmy Kurian

public class DataSetTester
{
	public static void main(String[] args)
	{

		DataSet data = new DataSet();

		data.addValue(1);
		data.addValue(2);
		data.addValue(-3);
		data.addValue(4);

	 	int sum = data.getSum();
		double avg = data.getAverage();
		int larg = data.getLargest();
		int sml = data.getSmallest();

		System.out.println("The Sum is: " + sum);
		System.out.println("Expected: 4");

		System.out.println("The Average is: " + avg);
		System.out.println("Expected: 1");

		System.out.println("The Largest value is: " + larg);
		System.out.println("Expected: 4");

		System.out.println("The smallest value is: " + sml);
		System.out.println("Expected: -3");
	}
}