How to assign objects created into an array in different class

Question

I am a very new beginner at Java and trying to make an array that holds objects created from another class.

To break it down, I have a class called TextBook, which stores the title of the book, and LibraryClass, which has a TextBook[] bookShelf member variable. This member array is where the textbooks will be stored.

So I think what I need to do is:

public class LibraryClass
{
    private TextBook[] bookShelf;

    public static void main(TextBook[] args, int x) {
        TextBook [] bookShelf = new TextBook[x];
        for(int i=0;i<bookShelf.length;i++)
        {
            bookShelf[i] = TextBook[];
        }
        }

bookShelf[i] = TextBook[]; is where I am stuck. The new textbook objects created will come out like textBook1, textBook2, textBook3 and so on. I need to somehow link bookShelf[i] to textBook1,2,3 etc. but how??

public static void main(TextBook[] args, int x) - is it allowed ? — Rahman
– Rahman, Commented Nov 2, 2015 at 15:50
so are you saying my main is wrong? the int x was supposed to be a single parameter which determines how many number of textbooks the bookshelf could hold — anony
– anony, Commented Nov 2, 2015 at 16:01
Step one - create an array that can hold TextBook objects. Correct. Step two - create those TextBook objects. Wrong syntax there; it should simply read bookShelf[i] = new TextBook(); assuming that your TextBook class has a constructor going without arguments. — GhostCat
– GhostCat, Commented Nov 2, 2015 at 16:05
Was there a problem with my answer that caused you to not accept it? — Kevin Klute
– Kevin Klute, Commented Nov 3, 2015 at 14:28

Kevin Klute · Accepted Answer · 2015-11-02 16:10:05Z

1

bookShelf[i] = new TextBook(); instead of bookShelf[i] = TextBook[]; assuming your TextBook class had a no args constructor.

This is how you create a new object new is a necessary keyword for this, and calling TextBook() will call the constructor of the object.

Every index in the array will have a new TextBook object.

These objects can be accessed with bookShelf[i] where i is the index of the object you are trying to access.

answered Nov 2, 2015 at 16:10

Kevin Klute

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