Constructing a class from a different class

I have two class: Library and Book.

I want to construct a Book class by calling its class constructor from the Library class. How can i do this? My code doesn't work (Error: Cannot find symbol - Constructor Book() )

Code:

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public void createBook()
{
  Book newBook;
           
  newBook = new Book(); //Error line 
}

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Here is the book constructor:

Code:

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public Book(String BookAuthor, String BookTitle, String BookCost, String NumberOfPages, String BookGenre, int bookEnjoyability)
{
  //Initialise variables
  this.BookAuthor = BookAuthor;
  this.BookTitle = BookTitle;
  this.BookCost = BookCost;
  this.NumberOfPages = NumberOfPages;
  this.BookGenre = BookGenre;
               
  this.bookEnjoyability = bookEnjoyability;
}

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You don't have the correct constructor:

You specify this:
public Book(String BookAuthor, String BookTitle, String BookCost, String NumberOfPages, String BookGenre, int bookEnjoyability)


But your calling a constructor that looks like this:

public Book()


Specify all the parameters and it should work:


Book b = new Book("author","title","cost","pages","genre","enjoyment");

I would also recommend making cost and pages ints.

In java a default constructor is automatically created, if you don't supply your own. Once you add your own constructor then the default one is not created.

Quote:

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Originally Posted by System_Error

I would also recommend making cost and pages ints.

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Thanks for your answer, i cant change the types of these variables as the specification for my assignment says they have to be string for some reason.

Quote:

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Originally Posted by System_Error

I would also recommend making cost and pages ints.

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As long as no calculations are being done on cost and pages then a string would be fine. Although you would want cost to be double, not int anyway.

Quote:

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Originally Posted by RyanEllis

As long as no calculations are being done on cost and pages then a string would be fine. Although you would want cost to be double, not int anyway.

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I disagree. The inexactness of floating point values makes them unsuitable for monetary calculations. You should use scaled ints or even longs. (That is, establish a convention that says that the int now stands for cents, or if you need the precision, hundredths of cents.)