JAVA DISCREPANCY PROBLEM

[Nathe Chan]

Can someone explain to me what the teacher is trying to get me to do?? I have problems understanding the question.

Here is the question.

Classes:::
You must create at least 2 classes to start off with. These classes are in "MovieInfo.java" which will be given to you.

And, while I have the MOVIEINFO.JAVA file open, I have been - all the time - left with utter confusion on what to do next. Can you guys please give me some hints and a hand out?

Here is the incomplete code. And, the teacher wants us to fill the rest of the lines in. I suppose that these concepts would have to do with inheritance.

//For Assign3 Winter 2009 

class MovieInfo
{

  private String strMovieTitle;
  private int intMovieDVD;
  private int intMovieBlueRay;
    
  private static double doubMovieDVDPrice;
  private static double doubMovieBlueRayPrice;

  MovieInfo(String title, int mDVD, int mBRay)
  {
  
     strMovieTitle = title;
	  intMovieDVD = mDVD;
	  intMovieBlueRay = mBRay;
	   

  }

  public String getMovieTitle()
  {
    // you finish this  
	 
  }
  
  public int getMovieStock(char which)
  {
    // you finish this 
	 // You can use "which" to determine which
	 // type of movie to retrieve the stock for 	  
  
  }
  
    
  public static double getMoviePrice(char which)
  {
     // you finish this 
	 // You can use "which" to determine which
	 // type of movie to retrieve the stock for  	  
  
  }
  
  

  public void setMovieStock(char which, int amt)
  {
    // you finish this 
	 // You can use "which" to determine which
	 // type of movie to set the stock for 	 
  }

    
   public static void setMoviePrice(char which, double prce)
	{
    // you finish this 
	 // You can use "which" to determine which
	 // type of movie to set the price for 
  }

  
  
}

///////////////////////////////

class MovieList
{

  MovieInfo[] mList;
  
  public void createList()
  {
  
      mList = new MovieInfo[7];
		mList[0] = new MovieInfo("Speed Racer",50,23);
		mList[1] = new MovieInfo("Star Trek XI",3,0);
		mList[2] = new MovieInfo("The Dark Knight",0,78);
		mList[3] = new MovieInfo("The X Files 2",34,5);
		mList[4] = new MovieInfo("Hulk",78,100);
		mList[5] = new MovieInfo("Iron Man", 0,0);
		mList[6] = new MovieInfo("Made of Honor",25,56);
		
	////////////////////////////////////////////////
	// IMPORTANT: PLEASE use "setMoviePrice()" method to 
	// set the PRICES FOR dvd OR BLU RAY HERE
	//            19.99 FOR DVD 
	//            35.99 for Blu Ray
	////////////////////////////////////////////////
	
	
	  
  }

} 

Can someone please give me a HINT of what to do next. I DON'T NEED THE ANSWERS .. just a push off the ground.

I am supposed to GET AND SET THESE VARIABLES and then later display the movie data in JList Boxes.

Thanks,

- Nathe

[Ryan Beckett]

Its hard to explain the concept so here whats one of the functions should look like. Its more of what to do rather than why.

 
public String getMovieTitle()  
{  
     return strMovieTitle;   
} 

[Ulf Dittmer]

I'm guessing that the "which" parameter is used to differentiate between DVDs and BluRays, so it could be either a "D" or a "B" (for example).

[Nathe Chan]

I still don't get it.

[Chuck Mondi]

For the getter methods, it looks like you need to use if logic to determine what to return. It looks like the constructor initializes the title and quantities for each format (DVD and Blu-ray) that are in stock. So, if you look at the getMovieStock(char which) method, how will that method know whether you want the stock number for the DVD or Blu-ray of say The Dark Knight? It uses the 'char which' method parameter. So if it uses a method parameter you will need to have if logic that will determine what stock number to return for the format the user requests. Here is what I would do. Use this type of logic for the other methods. Assume that types of movies have chars 'D' for DVD and 'B' for Blu-ray.

   public int getMovieStock(char which)  
   {  
     if (which == 'D'){
       return intMovieDVD;
     } else {
       return intMovieBlueRay;
     }
   }

As you can see, if movie is a DVD it will return the intMovieDVD amount, otherwise the movie is a Blu-ray and it will return the stock amount of intMovieBlueRay. As I said before you need to use similar logic for your other methods including the setters. If not, how will they know what variables to update?

[Campbell Ritchie]

Nathe Chan: please have a look at this FAQ: it is rude to write all UPPERCASE like that.

[Nathe Chan]

Okay, I'll be aware of that next time. Sorry, I didn't know that it was a rude technique.

- Nathe

[Campbell Ritchie]

Apologies accepted