The Big Programming Thread - Page 613

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FFGenerations

7088 Posts

April 14 2015 22:42 GMT

#12241

hi guys

got like 5 days to do my project now

i'm momentarily stuck trying to figure out this:
+ Show Spoiler +

long version
+ Show Spoiler +

i make a get request for movie information and store the response in an object

the response might contain multiple movies, coz if you search for "alien" you'll get several movies returned in the xml

so my movie (actually anime) class is autogenerated by jaxb from an xsd (xml) schema that i got just by making a search and saving the xml response

i want to be able to say


make the search request to the anime API

save the response into an object

extract each anime title from the object and print them to screen

this is REALLY simple but i don't know how to get the anime titles from the object .

the data is it is saved as a LIST so saying printscreen (getanime.name) doesnt work

short/detail version
+ Show Spoiler +

my object class has this

public List<Object> getAnimeOrManga() {
        if (animeOrManga == null) {
            animeOrManga = new ArrayList<Object>();
        }
        return this.animeOrManga;
    }

and this


       public String getName() {
            return name;
        }

i want to do something like:

for each animeOrManga
print the name of that animeormanga

i'll keep trying to read about lists

update: i changed it to + Show Spoiler +


for (Iterator<Object> i = gt.fetchMovie().getAnimeOrManga().iterator(); i.hasNext();){
    String name = i.getClass().getName();
    System.out.println(name);
 System.out.println("Hello, World");
    
}

all the red shit went away but nothing happens when it runs

+ Show Spoiler +


System.out.println (gt.fetchMovie().getAnimeOrManga().getClass().getName());

and getting run:
java.util.ArrayList
BUILD SUCCESSFUL (total time: 2 seconds)

which looks like progress. actually the getClass().getName() is rubbish

ok so the structure of the Ann class contains


public class Ann {

protected List<Object> animeOrManga;

public List<Object> getAnimeOrManga() {
        if (animeOrManga == null) {
            animeOrManga = new ArrayList<Object>();
        }
        return this.animeOrManga;
    }

public String getName() {
            return name;
        }

i need to find out how to access the getName()

i found i can write List<Ann.Anime.Info.Img> images; without it going red....

zzdd

United States484 Posts

April 14 2015 22:59 GMT

#12242

On April 15 2015 07:42 FFGenerations wrote:
hi guys

got like 5 days to do my project now

i'm momentarily stuck trying to figure out this:

long version
+ Show Spoiler +


make the search request to the anime API

save the response into an object

extract each anime title from the object and print them to screen

this is REALLY simple but i don't know how to get the anime titles from the object .

the data is it is saved as a LIST so saying printscreen (getanime.name) doesnt work

short/detail version
+ Show Spoiler +

my object class has this

public List<Object> getAnimeOrManga() {
        if (animeOrManga == null) {
            animeOrManga = new ArrayList<Object>();
        }
        return this.animeOrManga;
    }

and this


       public String getName() {
            return name;
        }

i want to do something like:

for each animeOrManga
print the name of that animeormanga

i'll keep trying to read about lists

https://docs.oracle.com/javase/7/docs/api/java/util/ListIterator.html

Shield

Bulgaria4824 Posts

April 15 2015 00:18 GMT

#12243

On April 15 2015 07:42 FFGenerations wrote:
hi guys

got like 5 days to do my project now

i'm momentarily stuck trying to figure out this:
+ Show Spoiler +

long version
+ Show Spoiler +


make the search request to the anime API

save the response into an object

extract each anime title from the object and print them to screen

this is REALLY simple but i don't know how to get the anime titles from the object .

the data is it is saved as a LIST so saying printscreen (getanime.name) doesnt work

short/detail version
+ Show Spoiler +

my object class has this

public List<Object> getAnimeOrManga() {
        if (animeOrManga == null) {
            animeOrManga = new ArrayList<Object>();
        }
        return this.animeOrManga;
    }

and this


       public String getName() {
            return name;
        }

i want to do something like:

for each animeOrManga
print the name of that animeormanga

i'll keep trying to read about lists

update: i changed it to + Show Spoiler +


for (Iterator<Object> i = gt.fetchMovie().getAnimeOrManga().iterator(); i.hasNext(){
    String name = i.getClass().getName();
    System.out.println(name);
 System.out.println("Hello, World");
    
}

all the red shit went away but nothing happens when it runs

+ Show Spoiler +


System.out.println (gt.fetchMovie().getAnimeOrManga().getClass().getName());

and getting run:
java.util.ArrayList
BUILD SUCCESSFUL (total time: 2 seconds)

which looks like progress. actually the getClass().getName() is rubbish

ok so the structure of the Ann class contains


public class Ann {

protected List<Object> animeOrManga;

public List<Object> getAnimeOrManga() {
        if (animeOrManga == null) {
            animeOrManga = new ArrayList<Object>();
        }
        return this.animeOrManga;
    }

public String getName() {
            return name;
        }

i need to find out how to access the getName()

i found i can write List<Ann.Anime.Info.Img> images; without it going red....

Just use neat syntax instead of iterators.


for (Class obj : list)
{
    obj.method(); // or whatever thing you need to do with obj
}

Thoughts:

1. List<Object> is incredibly stupid. You should use a common interface/base class instead.
2. Don't abuse lazy initialisation pattern. It doesn't help you here.

FFGenerations

7088 Posts

April 15 2015 00:33 GMT

#12244

thanks dude

1. the Ann class is autogenerated by jaxb xml binder which turned the xml into a java class automatically .

the generated Ann class is literally 4000 lines

if i knew how to take an xml file and just parse and extract just the values i want from it (i only want anime title and the url to the anime image) that might simplify things. right now i just done it by autogenerating it with the tool. the xml response gets put into the Ann class and i can access the properties of it from there , however now i am trying to access them through lists since i changed it to receive multiple animes instead of just 1

for example take an xml file with a ton of different elements. i want to extract data from only 2!!! of those elements. do i parse the whole thing into an object and access the elements i want? it sounds simple that way but it leaves me with this problem of not knowing ....how to access data the data .... which also should be straight forward as shit

its just impossible to find any fucking examples of anything that i want to do , and i'm not bright enough to just "figure stuff out". i sit here 90 minutes now ? and all i've "discovered" is that you can write "List<Ann.Anime.Info.Img> anime = new ArrayList<>();" and it doesnt turn red (but says the collection is never added to). let alone try to make a for loop that reads it (for (int i = 0; i < Ann.Anime.Info.Img; i++) { = cannot find symbol). etc

2. no idea what that means i guess i'll google.

as far as i know all i want to do is print the getter of the members of the animeOrManga list contained in the Ann class that i have just fetched

will take a break and get back to it

edit: might get somewhere with

    Object[] animestuff = gt.fetchMovie().getAnimeOrManga().toArray();
  
  System.out.println(animestuff);

taking abreak

Shield

Bulgaria4824 Posts

April 15 2015 00:41 GMT

#12245

On April 15 2015 09:33 FFGenerations wrote:
thanks dude

1. the Ann class is autogenerated by jaxb xml binder which turned the xml into a java class automatically .

the generated Ann class is literally 4000 lines

if i knew how to take an xml file and just parse and extract just the values i want from it (i only want anime title and the url to the anime image) that might simplify things. right now i just done it by autogenerating it with the tool. the xml response gets put into the Ann class and i can access the properties of it from there , however now i am trying to access them through lists since i changed it to receive multiple animes instead of just 1

for example take an xml file with a ton of different elements. i want to extract data from only 2!!! of those elements. do i parse the whole thing into an object and access the elements i want? it sounds simple that way but it leaves me with this problem of not knowing ....how to access data the data .... which also should be straight forward as shit

its just impossible to find any fucking examples of anything that i want to do , and i'm not bright enough to just "figure stuff out". i sit here 90 minutes now ? and all i've "discovered" is that you can write "List<Ann.Anime.Info.Img> anime = new ArrayList<>();" and it doesnt turn red (but says the collection is never added to). let alone try to make a for loop that reads it (for (int i = 0; i < Ann.Anime.Info.Img; i++) { = cannot find symbol). etc

2. no idea what that means i guess i'll google.

as far as i know all i want to do is print the getter of the members of the animeOrManga list contained in the Ann class that i have just fetched

will take a break and get back to it

The reason it doesn't turn red is because List<?> expects a class. If you replace ? with a class, then it's fine. List is just an interface for Java containers such as ArrayList and LinkedList.

You have a few ways to access its data.

1. Iterators

2. For-ranged loop. Say you have:

List<Integer> list = new ArrayList<Integer>();


for (Integer entry : list)
{
    System.out.println(entry);
}

3. Random access


for (int i = 0; i < list.size(); ++i)
{
    Integer entry = list.get(i);
    System.out.println(entry);
}

Lazy initialisation is what you're doing with list's initialisation. You only initialise it on demand, but you don't improve performance noticeably enough as it is a cheap enough operation anyway.

edit: might get somewhere with

    Object[] animestuff = gt.fetchMovie().getAnimeOrManga().toArray();
  
  System.out.println(animestuff);

taking abreak

You can use the for-ranged loop approach.


for (Object entry : animestuff)
{
    System.out.println("Useless object type as you can't use its methods.");
}

FFGenerations

7088 Posts

April 15 2015 03:19 GMT

#12246

how do i refer to it so that the methods are available?

so far i have....


Object[] list = gt.fetchMovie().getAnimeOrManga().toArray();
      System.out.println(list);

this prints : [Ljava.lang.Object;@4b2c5e02


  Object[] list = gt.fetchMovie().getAnimeOrManga().toArray();
//      System.out.println(list);
       for (Object item: list){
     System.out.println(item);

this does nothing


 List<Object> animeOrManga = gt.fetchMovie().getAnimeOrManga();
 
 for (Object item: animeOrManga){
     System.out.println(item);
 }

this does nothing too

i want to be able to put item.getName(); somewhere, right? but this is never available or even come close to finding it....

i posted on stack overflow now http://stackoverflow.com/questions/29640606/accessing-a-list-in-a-java-object

someone said make another class and put in the name attribute there and someone said clone the list , the 3rd person said go read a book (great)

WolfintheSheep

Canada14127 Posts

April 15 2015 03:27 GMT

#12247

The List you're using is a collection of generic Object types. Object does not have a name variable, or a getName method.

You need to define a class (let's call it AnimeOrManga), give it a name variable, give it a public method getName() to return the name, and then declare your collection as List<AnimeOrManga>.

FFGenerations

7088 Posts

April 15 2015 03:35 GMT

#12248

the class exists already...

gt().fetchMovie() saves the GET request data into the Ann class

public Ann fetchMovie() {
        
        return target.queryParam("kon")
                .request(MediaType.TEXT_HTML)
                .header("Content-type", "text/html")//application_json or text_html or xml
                .get(Ann.class);

this works so far.

the Ann class contains , from what i can gather, a list

 public List<Object> getAnimeOrManga() {
        if (animeOrManga == null) {
            animeOrManga = new ArrayList<Object>();
        }
        return this.animeOrManga;
    }

the list can contains a class Anime and a class Manga


public static class Anime {

class Anime contains string name (and stuff like List Info) and the setters and getters

   public String getName() {
            return name;
        }

i just need some syntax to get to getName(); after i call gt.fetchMovie().something()

[image loading]

is this making more sense to you than it does to me?

Blitzkrieg0

United States13132 Posts

April 15 2015 03:45 GMT

#12249

You want to use inheritance. You can read about it here

Anime and Manga should be a subclass of Ann I assume, but I have no idea what Ann actually is.

WolfintheSheep

Canada14127 Posts

April 15 2015 03:51 GMT

#12250

It makes...some sense.

One, I don't see where the List is being filled with classes. I'm assuming you just didn't post that part. If not...well, that's a major point right there.

The fact that there's an Anime class and a Manga class is rather critical, since now you have a List of two objects. If you want that, you need a parent class (let's call it Media) which Anime and Manga inherit from, and that parent class should have the "name" variable and "getName()" method. Then your List should be of type List<Media>.

FFGenerations

7088 Posts

April 15 2015 03:54 GMT

#12251

Ann is the autogenerated .java class that stores the XML data as a java class

I took a sample XML response from making a search on the anime website , converted it to XSD then netbeans automatically created a java class from it

its just a huge fucking class that contains all the attributes of the XML file (anime name, type, info etc, some of these are lists)

this is Ann

http://pastebin.com/zzpbY6Sg

this is JavaApplication4 (the run file)

http://pastebin.com/SaGH3gdF

this is the web service gt/getservice

http://pastebin.com/5ePcZVi3

WolfintheSheep

Canada14127 Posts

April 15 2015 03:57 GMT

#12252

Well, in that case it's basically glhf for you.

Autogenerated code is generally a mess to go through, so really the choices are to go through the documentation to get what you want out of it, or do it from scratch so that you know what you have.

Blitzkrieg0

United States13132 Posts

April 15 2015 03:58 GMT

#12253

On April 15 2015 12:54 FFGenerations wrote:
Ann is the autogenerated .java class that stores the XML data as a java class

I took a sample XML response from making a search on the anime website , converted it to XSD then netbeans automatically created a java class from it

its just a huge fucking class that contains all the attributes of the XML file (anime name, type, info etc, some of these are lists)

this is Ann

http://pastebin.com/zzpbY6Sg

this is JavaApplication4 (the run file)

http://pastebin.com/SaGH3gdF

this is the web service gt/getservice

http://pastebin.com/5ePcZVi3

So you auto generated a bunch of code and you have no idea what it does. Good luck.

FFGenerations

7088 Posts

April 15 2015 04:07 GMT

#12254

its simply a java class of an xml file, i just dont know the syntax to access the lists inside it . it shouldnt be particularly challenging thing to do theoretically

i'm gonna look at ways to custom parse the xml file so i'm only dealing with the data i want, although i fear that data would still be structured in the same way and i might end up with the same problem

if i can take the xml response and use a parser to only extract the <anime name> tag and <info type=Picture> portions then that would be just dandy ( i guess)

Blitzkrieg0

United States13132 Posts

April 15 2015 04:14 GMT

#12255

On April 15 2015 13:07 FFGenerations wrote:
its simply a java class of an xml file, i just dont know the syntax to access the lists inside it . it shouldnt be particularly challenging thing to do theoretically

You have to go in and manually change a bunch of the code if you want it to work and this is going to be impossible since you have no idea what it generated. For example, it has an ArrayList of Objects. This needs to be an ArrayList of say Media as WolfInTheSheep suggested. Then you need to add the Media class and make the other classes subclasses of the Media class. Soon you're going to have an exponential cascade of bandaids to the point where you're better off just rewriting the class so it only has exactly what you need instead of fixing four thousand lines of auto generation.

Did you even read the code you're using? There is a comment in the code you pasted that tells you what to do already...

// List<Ann> list = new ArrayList<>(); // You want the list as specific as possible

The list being as specific as possible means changing the generic of the ArrayList. Even if your XML worked you'd still be printing garbage because of this.

WolfintheSheep

Canada14127 Posts

April 15 2015 04:20 GMT

#12256

Well, your problem still comes down to the same thing. Your autogenerated code defines two completely separate classes, Anime and Manga, and it shoves it all into a single List that can contain any generic Object type.

So you either need to edit the code (which looks like it'll be a pain), try working from scratch (which is really advisable), or do something really ugly like:

for (Object item: animeOrManga){
     if(item instanceof Anime){
           Anime a = (Anime) item;
           System.out.println(a.getName());
     }elseif(item instanceof Manga){
           Manga m = (Manga) item;
           System.out.println(m.getName());
     }
 }

Do note that if you use the latter option, I will probably feel the need to punch you through your computer screen.

FFGenerations

7088 Posts

April 15 2015 04:41 GMT

#12257

wow that actually fucking worked, after i figured out that my queryparamter for the get request was blank for some reason so nothings being returned this whole time anyway

ok so another method is :


  Object[] list = gt.fetchMovie().getAnimeOrManga().toArray();

       for (Object item: list){
     System.out.println(item.toString());

and to override the toString() method in the class to make it do something different


  public String getName() {
            return name;
        }
        @Override
        public String toString() {
        return name;
        }

edit:

ok well i've given up trying to make it work this way for now. i sort of understand what you've been saying earlier about the autogenerated thing being fucked up. what you wrote totally flew over my head before, but you kept railing on about it until i started to understand. thanks all, you've been brilliant!

will move on to trying to parse it myself instead

sabas123

Netherlands3122 Posts

April 15 2015 07:32 GMT

#12258

On April 15 2015 06:25 Manit0u wrote:
You're calling $roomlist->getRoom(1) but you're not binding it to any variable, so every time you call $roomlist it creates a new room instance (At least that's what it looks like).

What you need to do is this:


$room = $roomlist->getRoom(1);

$room->setClients('some value');

$test = $room->getClients();
$test2 = $room->getClients();

Tell me if it works.

That code did work, So I geuss it has to do somethign with the getRoom function. sadly I don't understand why it would constantly give a new array. considering the new array should be stored in $system->getRoomList()

sabas123

Netherlands3122 Posts

April 15 2015 07:54 GMT

#12259

Ok I fixed it, I wrote a function that would check if the array had NULL, but something went wrong and always returned false. thus always making a new array.

Manit0u

Poland17242 Posts

April 15 2015 10:14 GMT

#12260

On April 15 2015 16:32 sabas123 wrote:

Show nested quote +


$room = $roomlist->getRoom(1);

$room->setClients('some value');

$test = $room->getClients();
$test2 = $room->getClients();

Tell me if it works.

There's nothing wrong with the getRoom function. What was wrong was calling it twice since each call to getRoom would create a new instance of the class. At least that's what I gather from the behaviour you described.

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