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Nov 4th, 2008

Re: Creating and Using Exceptions

look at the method below

Java Syntax (Toggle Plain Text)
public void addMovieGoers(Human h) throws IllegalAgeException
    {
        Human a = new Adult("Joe",43);
        Human b = new Adult("Sue",39);
        Human c = new Adult("Tracy",20);
        Human d = new Child("Sammy",17);
        Human e = new Child("Julie",12);
        Human f = new Child("Mona",6);
        hm.add(a);hm.add(b);hm.add(c);hm.add(d);
        hm.add(e);hm.add(f);
 
        hm.trimToSize();
        String toPrint = "";
 
            if(movieNew.getRating()!=null && movieNew.getTitle()!=null)
            {
                 if(mrPG.equals(movieNew.getRating())) //movies rated PG
                 {                        
                    System.out.println("The following can only watch under parental guidance:");
                    for(int i = 0; i < hm.size(); i++)
                    {
                        Human test = (Human)hm.get(i);
                        if ( test instanceof Child)
                        {
                            if(toPrint.equals("")) 
                            {
                                System.out.println(test);  
                            }
                            else
                            {
                                 System.out.println("Children: " + toPrint);
                            }
                         }
                     }
                }
                else if(mrA.equals(movieNew.getRating())) //movies rated Adult
                {
                    System.out.println("The following can watch...");
                    for ( int i = 0; i < hm.size(); i++)
                    {
                        Human test = (Human)hm.get(i);
                        if ( test instanceof Adult)
                        {
                            if(toPrint.equals("")) 
                            {
                                System.out.println(test);  
                            }
                            else
                            {
                                 System.out.println("Adults: " + toPrint);
                            }
                        }
 
                    } 
                }
                else if(mrG.equals(movieNew.getRating()))//Movies rated G
                {                        
                    System.out.println("This is movie rated G. So the following can watch"+
                            ": "+hm+"");
                }
                else
                {
                    throw new IllegalAgeException("You may not be old enough to watch a movie.");
                }
            }
 
 
    }
public void addMovieGoers(Human h) throws IllegalAgeException
    {
        Human a = new Adult("Joe",43);
        Human b = new Adult("Sue",39);
        Human c = new Adult("Tracy",20);
        Human d = new Child("Sammy",17);
        Human e = new Child("Julie",12);
        Human f = new Child("Mona",6);
        hm.add(a);hm.add(b);hm.add(c);hm.add(d);
        hm.add(e);hm.add(f);
        
        hm.trimToSize();
        String toPrint = "";
        
            if(movieNew.getRating()!=null && movieNew.getTitle()!=null)
            {
                 if(mrPG.equals(movieNew.getRating())) //movies rated PG
                 {                        
                    System.out.println("The following can only watch under parental guidance:");
                    for(int i = 0; i < hm.size(); i++)
                    {
                        Human test = (Human)hm.get(i);
                        if ( test instanceof Child)
                        {
                            if(toPrint.equals("")) 
                            {
                                System.out.println(test);  
                            }
                            else
                            {
                                 System.out.println("Children: " + toPrint);
                            }
                         }
                     }
                }
                else if(mrA.equals(movieNew.getRating())) //movies rated Adult
                {
                    System.out.println("The following can watch...");
                    for ( int i = 0; i < hm.size(); i++)
                    {
                        Human test = (Human)hm.get(i);
                        if ( test instanceof Adult)
                        {
                            if(toPrint.equals("")) 
                            {
                                System.out.println(test);  
                            }
                            else
                            {
                                 System.out.println("Adults: " + toPrint);
                            }
                        }

                    } 
                }
                else if(mrG.equals(movieNew.getRating()))//Movies rated G
                {                        
                    System.out.println("This is movie rated G. So the following can watch"+
                            ": "+hm+"");
                }
                else
                {
                    throw new IllegalAgeException("You may not be old enough to watch a movie.");
                }
            }

        
    }

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?

Achupa

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Nov 4th, 2008

Re: Creating and Using Exceptions

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)
Human a = new Adult("Joe",43);
        Human b = new Adult("Sue",39);
        Human c = new Adult("Tracy",20);
        Human d = new Child("Sammy",17);
        Human e = new Child("Julie",12);
        Human f = new Child("Mona",6);
        hm.add(a);hm.add(b);hm.add(c);hm.add(d);
        hm.add(e);hm.add(f);
Human a = new Adult("Joe",43);
        Human b = new Adult("Sue",39);
        Human c = new Adult("Tracy",20);
        Human d = new Child("Sammy",17);
        Human e = new Child("Julie",12);
        Human f = new Child("Mona",6);
        hm.add(a);hm.add(b);hm.add(c);hm.add(d);
        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.

javaAddict

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