Question

Write a class encapsulating the concept of a vendor, if a vendor has the following attributes: company name, id, array of quarterly purchase order totals (4 double elements). Include a constructor, accessor, mutator, and toString methods. Also code the following methods: one returning the total purchase orders (total all array elements) and a method to modify an array element (change the value of an array element). Write a client class to create 2 vendor objects and test all your methods.

Answer 1

import java.util.Arrays;

class Vendor {
   private String companyName;
   private int id;
   private double orderTotals[] = new double[4];

   public Vendor() {

   }

   // constructor initialize the values
   public Vendor(String aCompanyName, int aId, double[] aOrderTotals) {
       companyName = aCompanyName;
       id = aId;
       orderTotals = aOrderTotals;
   }

   // setters and getters
   public String getCompanyName() {
       return companyName;
   }

   public void setCompanyName(String aCompanyName) {
       companyName = aCompanyName;
   }

   public int getId() {
       return id;
   }

   public void setId(int aId) {
       id = aId;
   }

   public double[] getOrderTotals() {
       return orderTotals;
   }

   public void setOrderTotals(double[] aOrderTotals) {
       orderTotals = aOrderTotals;
   }

   // toString will return the string representaion of object
   public String toString() {
       return "Vendor [companyName=" + companyName + ", id=" + id + ", orderTotals=" + Arrays.toString(orderTotals)
               + "]";
   }

}

public class TestVendor {
   public static void main(String[] args) {
       double t1[] = { 10, 20, 14, 25 };
       // creating vendor object with constructor
       Vendor v1 = new Vendor("ABC", 1, t1);
       // printing v1 so it will call toString and print object details
       System.out.println(v1);
       double t2[] = { 19, 42, 12, 21 };
       // creating vendor object with default constructor
       Vendor v2 = new Vendor();
       // setting values using setters
       v2.setCompanyName("XYZ");
       v2.setId(2);
       v2.setOrderTotals(t2);
       System.out.println(v2);
   }
}