Arrays with different datatypes i e strings and integers Objectorientend

Question

For example I have 3 books  Booknumber  int   Booktitle  string   Booklanguage  string   Bookprice  int    Now  I want to have an array called books 3  4    I m getting the data I set via setBooknumber like this  Book1 getBooknumber    Book1 getBooktitle       Book3 getBookprice     How do I realize this  books 3  4  array    I can t call it String books       new String  3  4   Because I can t get Booknumber  int  into it   I don t want Booknumber to be String neither Bookprice  How do I realize it  please   To further elaborate it   I have 2 classes   book and bookUI   book  public class book  String Booktitle  Booklanguage  int Booknumber  Bookprice     constructor    get    set     bookUI  public class bookUI    public static void main String arg          book book1   new book       book book2   new book       book book3   new book        book1 setBooktitle              book3 setBookprice          Here I want to have books 3  4  Array  And gettin the data via book1 get   book3 get into the array

User · Answer

Notice the repetition of Book in Booknumber  int   Booktitle  string   Booklanguage  string   Bookprice  int - it screams for a class type   class Book     int number    String title    String language    int price      Now you can simply have   Book   books   new Books 3     If you want arrays  you can declare it as object array an insert Integer and String into it   Object books 3  4

User · Answer

Why not create a class Book with properties  Number  Title  and Price  Then store them in a single dimensional array   That way instead of calling  Book i  j       to get your books title  call  Book i  Title   Seems to me like it would be a bit more manageable and code friendly

User · Answer

public class Book       public int number      public String title      public String language      public int price          Add constructor  get  set  as needed      then declare your array as   Book   books   new Book 3     EDIT  In response to O P  s confusion   Book should be an object  not an array   Each book should be created on it s own  via a properly designed constructor  and then added to the array   In fact  I wouldn t use an array  but an ArrayList   In other words  you are trying to force data into containers that aren t suitable for the task at hand     I would venture that 50  of programming is choosing the right data structure for your data   Algorithms naturally follow if there is a good choice of structure   When properly done  you get your UI class to look like  Edit  Generics added to the following code snippet       ArrayList lt Book gt  myLibrary   new ArrayList lt Book gt     myLibrary add new Book 1   Thinking In Java    English   4999    myLibrary add new Book 2   Hacking for Fun and Profit    English   1099     etc   now you can use the Collections interface and do something like   int total   0  for  Book b   myLibrary       total    b price     System out println b      Assuming a valid toString in the Book class   System out println  The total value of your library is     total

User · Answer

NoCanDo  You cannot create an array with different data types because java only supports variables with a specific data type or object  When you are creating an array  you are pulling together an assortment of similar variables -- almost like an extended variable  All of the variables must be of the same type therefore  Java cannot differentiate the data type of your variable unless you tell it what it is  Ex  int tells all your variables declared to it are of data type int  What you could do is create 3 arrays with corresponding information   int bookNumber      1  2  3  4  5   int bookName      nameOfBook1  nameOfBook2  nameOfBook3  nameOfBook4  nameOfBook5     etc   etc    Now  a single index number gives you all the info for that book  Ex  All of your arrays with index number 0   0   have information for book 1

User · Answer

use object type ie Object books 3  4

[java] Arrays with different datatypes i.e. strings and integers. (Objectorientend)

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