This class project is a bag class that collects and stores double sequences with the ability to rectrieve different types of information from it. The project focuses on the concept of information collection in bags and the creation of classes that use methods and static methods. This Statistician class provides a flexible and reusable solution for statistical analysis of double sequences, adhering to best practices in Java programming.
public class Statistician
{
//Instance fields
private int length;
private double sum;
private double mean;
private double min;
private double max;
private double lastNum;
//Constructor that sets everything to 0 or NaN for a baseline object
public Statistician()
{
this.length = 0;
this.sum = 0;
this.mean = 0;
this.lastNum = 0;
this.min = 0;
this.max = 0;
}
public void addAll(Statistician addend)
{
if(addend == null)
throw new NullPointerException("Null object used");
else if(length == 0){
this.min = addend.min;
this.max = addend.max;
this.lastNum = addend.lastNum;
this.length = addend.length;
this.sum = addend.sum;
this.mean = addend.mean;
}
else if(addend.length != 0){
if(min > addend.min)
this.min = addend.min;
if(max < addend.max)
this.max = addend.max;
this.lastNum = addend.lastNum;
this.length += addend.length;
this.sum += addend.sum;
this.mean = sum/length;
}
}
public static Statistician add(Statistician s1, Statistician s2)
{
//Null object test
if(s1 == null || s2 == null)
throw new NullPointerException("Null object used");
else{
Statistician s3 = new Statistician();
s3.addAll(s1);
s3.addAll(s2);
return s3;
}
}