Adding to an ArrayList from another class

Question

I have two classes. Museum and Painting. The Painting class is working as expected, but I am having issues with the Museum class. We have been asked to create a method signature that will addPainting(String, String) which has two parameters Artist and Location and adds a new Painting to the museum paintings collection.

When I try to compile the code, I get no suitable matching methods found?

Does anyone know what I'm missing here?

public class Museum  {
    //creating the fields
    private ArrayList<Painting> paintings;
    private String name;

    /**
     * Create a Museum Class 
     */
    public Museum(String aMuseum) {
        paintings = new ArrayList<>();
        name = aMuseum;
    }

    /**
    * Add a painting from the Paintings class
    */
    public void addPainting(String artist, String location) {
        paintings.add(artist, location);
    }
}

paintings::add takes a single argument of type Painting, not two arguments of type Strings. — Turing85
– Turing85, Commented Nov 7, 2021 at 11:55
You are missing many key concepts, instead of fixing this code right away, I would suggest first read about Generics (docs.oracle.com/javase/tutorial/java/generics/index.html) and then read about ArrayList — hagrawal7777
– hagrawal7777, Commented Nov 7, 2021 at 12:19
You want to add a new Painting; so, it should be paintings.add(new Painting(artist, location)); — Arvind Kumar Avinash
– Arvind Kumar Avinash, Commented Nov 7, 2021 at 12:21

João Dias · Accepted Answer · 2021-11-07 12:20:08Z

2

You should create a new Painting object, and then add it to the paintings list.

instead of

paintings.add(artist, location);

you should do something like:

Painting p = new Painting(artist, location);
paintings.add(p);

Of course, you should also implement the Painting constructor (in the Painting class).

edited Nov 7, 2021 at 12:20

João Dias

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answered Nov 7, 2021 at 11:56

javadev

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2 Comments

user17349337 Over a year ago

Thanks. This allows me to add paintings directly to the Musuem array list. The challenge I am having is when I add a new object to the Paintings class, this should store within the Museum array list. I could be wrong, but I think I need to somehow call on a method from within the Paintings class to retreive this information?

javadev Over a year ago

If you want to use this list from out of the Museum class, you should have a "getter" method, in order you can getPaintings() and iterate the list's objects.

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