Creating and Using Exceptions

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Re: Creating and Using Exceptions

 
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  #11
Nov 4th, 2008
look at the method below
Java Syntax (Toggle Plain Text) 
  1. public void addMovieGoers(Human h) throws IllegalAgeException
  2.     {
  3.         Human a = new Adult("Joe",43);
  4.         Human b = new Adult("Sue",39);
  5.         Human c = new Adult("Tracy",20);
  6.         Human d = new Child("Sammy",17);
  7.         Human e = new Child("Julie",12);
  8.         Human f = new Child("Mona",6);
  9.         hm.add(a);hm.add(b);hm.add(c);hm.add(d);
  10.         hm.add(e);hm.add(f);
  11.  
  12.         hm.trimToSize();
  13.         String toPrint = "";
  14.  
  15.             if(movieNew.getRating()!=null && movieNew.getTitle()!=null)
  16.             {
  17.                  if(mrPG.equals(movieNew.getRating())) //movies rated PG
  18.                  {                        
  19.                     System.out.println("The following can only watch under parental guidance:");
  20.                     for(int i = 0; i < hm.size(); i++)
  21.                     {
  22.                         Human test = (Human)hm.get(i);
  23.                         if ( test instanceof Child)
  24.                         {
  25.                             if(toPrint.equals("")) 
  26.                             {
  27.                                 System.out.println(test);  
  28.                             }
  29.                             else
  30.                             {
  31.                                  System.out.println("Children: " + toPrint);
  32.                             }
  33.                          }
  34.                      }
  35.                 }
  36.                 else if(mrA.equals(movieNew.getRating())) //movies rated Adult
  37.                 {
  38.                     System.out.println("The following can watch...");
  39.                     for ( int i = 0; i < hm.size(); i++)
  40.                     {
  41.                         Human test = (Human)hm.get(i);
  42.                         if ( test instanceof Adult)
  43.                         {
  44.                             if(toPrint.equals("")) 
  45.                             {
  46.                                 System.out.println(test);  
  47.                             }
  48.                             else
  49.                             {
  50.                                  System.out.println("Adults: " + toPrint);
  51.                             }
  52.                         }
  53.  
  54.                     } 
  55.                 }
  56.                 else if(mrG.equals(movieNew.getRating()))//Movies rated G
  57.                 {                        
  58.                     System.out.println("This is movie rated G. So the following can watch"+
  59.                             ": "+hm+"");
  60.                 }
  61.                 else
  62.                 {
  63.                     throw new IllegalAgeException("You may not be old enough to watch a movie.");
  64.                 }
  65.             }
  66.  
  67.  
  68.     }

javaAddict is telling me :"You are making the same mistake with addMovieGoers. You are supposed to take the argument and add it to the ArrayList. The user calling the method will set which "humans" will "watch" the movie. And again you are using fixed values. It is as if the method has no meaning of existence since it makes no difference what the argument is since you don't use it"

So can you help me correct this?
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Re: Creating and Using Exceptions

 
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  #12
Nov 4th, 2008
The argument: Human h is the one to be added in the ArrayList.
The way you have it. no matter what the argument is, you will always insert the same values:
Java Syntax (Toggle Plain Text) 
  1. Human a = new Adult("Joe",43);
  2.         Human b = new Adult("Sue",39);
  3.         Human c = new Adult("Tracy",20);
  4.         Human d = new Child("Sammy",17);
  5.         Human e = new Child("Julie",12);
  6.         Human f = new Child("Mona",6);
  7.         hm.add(a);hm.add(b);hm.add(c);hm.add(d);
  8.         hm.add(e);hm.add(f);

It is the argument that you need to insert. Of course before adding it do whatever checks are necessary.
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