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Apr 8th, 2009

Beginer Java Coder....

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Here is my assignment:

Write a class named 'Video' that has two attributes, a title (type String) and rating (type int). Then write an application class named 'VideoStore' that first creates an array consisting of 5 video objects, then display the list three times; first unsorted, then sorted by title and finally sorted by rating.

I understand an array, i understand how to make an array, and i understand how to display the array. My problem is that i don't understand how to combine the two arrays to create this list that my instructor is looking for. I am not looking for a straight answer, but if there is any resources that you can post or maybe a dummy code that i can use for reference that would be great. Thanks everyone

hollywoood69

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Apr 8th, 2009

Re: Beginer Java Coder....

What it appears you need to do is simply create one array, of type Video. Video will be a class you have to write, simple enough: Constructor with the two parameters and then return methods.

Once this class and the arrays are constructed you can construct new Video objects and load them into an array.

LevelSix

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Apr 8th, 2009

Re: Beginer Java Coder....

Click to Expand / Collapse Quote originally posted by LevelSix ...

What it appears you need to do is simply create one array, of type Video. Video will be a class you have to write, simple enough: Constructor with the two parameters and then return methods.

Once this class and the arrays are constructed you can construct new Video objects and load them into an array.

That is the problem that i am having. I am not understanding those parts of it. I am very new and the instructor isnt very helpful. And when you say to have the constructor with two paramerters how would i do that?

Thanks again for the help!

hollywoood69

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Re: Beginer Java Coder....

Your class is named Video. The Video class has a String and an int as data members. Your other class is VideoStore. It has an array of videos as its only data member. If you know how to create an array, then you should have no problems.

Video[] theVideos = new Video[howeverManyVideosYouHave];

If you wanted to make a class called Car, it might look like this

Java Syntax (Toggle Plain Text)
public class Car{
//The data members
public String color;
public int weight;
 
//The constructor
public Car(String theColor, int theWeight){
color = theColor;
weight = theWeight;
}
}
public class Car{
//The data members
public String color;
public int weight;

//The constructor
public Car(String theColor, int theWeight){
color = theColor;
weight = theWeight;
}
}

Now, consider a 'Car Dealership' where the Car Dealership typically has a lot of Cars...

Java Syntax (Toggle Plain Text)
public class CarDealership{
Car[] theCars;
 
public CarDealership(Car[] cars){
theCars = cars;
}
}
public class CarDealership{
Car[] theCars;

public CarDealership(Car[] cars){
theCars = cars;
}
}

Last edited by BestJewSinceJC; Apr 8th, 2009 at 3:55 pm.

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Apr 8th, 2009

Re: Beginer Java Coder....

Constructor for class video would appear as:
public Video(String name, int rating)
{
///store name and rating to instance fields
}
Then you would have methods such as:
public String getVideoName()
{
return //instance field of video name
}

Instance fields if you're unaware are just global variables:
private String videoName //for example.

LevelSix

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Apr 8th, 2009

Re: Beginer Java Coder....

I will post what i have in just a little bit. I think I have an idea of what i need to do. Maybe when i post what i have it will help with what I am doing wrong.

Thanks everyone for the help

hollywoood69

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Apr 8th, 2009

Re: Beginer Java Coder....

LevelSix-

Thank you. I will post something within the hour. If i have problems...well i will be back

Thank you again!

hollywoood69

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Apr 8th, 2009

Re: Beginer Java Coder....

hollywood - if you need more help, look at the example I provided.

BestJewSinceJC

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Re: Beginer Java Coder....

There is only one array involved that you need to use. Video class represent an object that has to be stored in array.
I'm not gone do Video class for you as that is simple and judging by assignment topic you should be familiar with it. So assuming you already created your Video class this is skeloton of what you supposed to do

Java Syntax (Toggle Plain Text)
public class VideoTest {
 
    public static void main(String[] args){
    	Video[] video = new Video[5];
    	video[0] = new Video("Fast and Furious", 1);
    	video[1] = new Video("Save private Rayne", 5);
 
    	printVideoList(video);
    	printByTitle(video);
    	printByRating(video);
    }
 
    private static void printVideoList(Video[] video){}
 
    private static void printByTitle(Video[] video){}
 
    private static void printByRating(Video[] video){}
}
public class VideoTest {

    public static void main(String[] args){
    	Video[] video = new Video[5];
    	video[0] = new Video("Fast and Furious", 1);
    	video[1] = new Video("Save private Rayne", 5);
    	
    	printVideoList(video);
    	printByTitle(video);
    	printByRating(video);
    }
    
    private static void printVideoList(Video[] video){}
    
    private static void printByTitle(Video[] video){}
    
    private static void printByRating(Video[] video){}
}

printVideoList() - uses just simple loop mechanism to print the list
printByTitle() - need to be first sorted by title and then printed out
printByRating() - need to be first sorted by rating and then printed out

Two things, if you clever you will reuse printVideoList() to help you out after sorting. Two, few days ago I made a post in regards of simple sorting that can be reused too...

peter_budo

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Apr 8th, 2009

Re: Beginer Java Coder....

Alright...maybe i don't know as much as I claim or think

. I am still having major problems. I have got the video class done (I think....I'll post what i have), now i am having issues with the VideoStore class...
I think i am going to become a seamstress....

Here is what i have so far. Maybe I am way off.

Quote ...

public class Video {

String[] movieTitle = new String[5];
int[] movieRating = new int[5];

public Video(){

}

public Video(String[] j_movieTitle, int[] j_movieRating){

movieTitle = j_movieTitle;
movieRating = j_movieRating;
}

public void setMovie(String[] j_movieTitle){
movieTitle = j_movieTitle;
}

public String[] getMovie() {
return(movieTitle);
}

public void setRating(int[] j_movieRating) {
movieRating = j_movieRating;
}

public int[] getRating() {
return(movieRating);
}

}

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