You operate several news paper stands distributed throughout town. Define a clas

Question

You operate several news paper stands distributed throughout town. Define a class named NewsPaperStand that has a member variable for the news paper stand’s ID number and a member variable for how many news papers the stand sold that day. Create a constructor that allows a user of the class to initialize both values.

Also create a function named OneSold that increments the number of news papers the stand has sold by one. This function will be invoked each time the stand sells a news paper so that you can track the total number of news papers sold by the stand. Add another function that returns the number of news papers sold.

Finally, add a static variable that tracks the total number of news papers sold by allnews paper stands and a static function that returns the value in this variable. Write a main function to test your class with at least three news paper stands that each sell a variety of news papers.

Explanation / Answer

/**
* @author srinu
*
*/
public class NewsPaperStand {

   String standsID;
   int standsSold;

   static int newsPapersSold = 0;

   /**
   * @param standsID
   * @param standsSold
   */
   public NewsPaperStand(String standsID, int standsSold) {

       this.standsID = standsID;
       this.standsSold = standsSold;
       newsPapersSold += standsSold;

   }

   /**
   *
   */
   public void OneSold() {

       standsSold++;
       newsPapersSold++;

   }

   /**
   * @return
   */
   public int numberOfNewsPapersStandsSold() {

       return standsSold;
   }

   /**
   * @return the newsPapersSold
   */
   public static int getNewsPapersSold() {
       return newsPapersSold;
   }

   /**
   * @param newsPapersSold
   * the newsPapersSold to set
   */
   public static void setNewsPapersSold(int newsPapersSold) {
       NewsPaperStand.newsPapersSold = newsPapersSold;
   }

   /**
   * @param args
   */
   public static void main(String[] args) {

       NewsPaperStand newsPaperStand1 = new NewsPaperStand("news paper1", 5);
       NewsPaperStand newsPaperStand2 = new NewsPaperStand("news paper2", 6);
       NewsPaperStand newsPaperStand3 = new NewsPaperStand("news paper3", 7);

       System.out.println("News paper1 :"
               + newsPaperStand1.numberOfNewsPapersStandsSold());
       System.out.println("News paper2 :"
               + newsPaperStand2.numberOfNewsPapersStandsSold());
       System.out.println("News paper3 :"
               + newsPaperStand3.numberOfNewsPapersStandsSold());

       System.out.println("News paper1 sold by one: ");
       newsPaperStand1.OneSold();
       System.out.println("News paper1 : "
               + newsPaperStand1.numberOfNewsPapersStandsSold());

       System.out
               .println("the total number of news papers sold by allnews paper stands : "
                       + NewsPaperStand.getNewsPapersSold());
   }

}

OUTPUT:

News paper1 :5
News paper2 :6
News paper3 :7
News paper1 sold by one:
News paper1 : 6
the total number of news papers sold by allnews paper stands : 19

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