如何将创建的对象分配到不同类中的数组中

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??

Answer 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.